NHCO PHLEBOTOMY EXAMS SET
FEATURING SOLVED QUESTIONS AND
ACCURACY CHECKED ANSWERS
NHCO Phlebotomy Certification Practice Exam
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Question 1 mn
Why is it important for a phlebotomist to verify the patient's identity before performing a venip
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uncture?
• A) To ensure the correct billing information is applied.
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• B) To comply with HIPAA regulations regarding patient privacy.
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• C) To guarantee the safety and accuracy of laboratory results for the correct patient.
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• D) To determine the patient's preferred language for communication.
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Correct Answer: C mn mn
Explanation: Patient identification is the single most critical step in phlebotomy to prevent mislabelin
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g and transfusion errors, which directly impacts patient safety and the accuracy of diagnostic testing.
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Question 2 mn
Which of the following needle gauges has the LARGEST lumen (bore)?
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• A) 18-gauge mn
• B) 20-gauge mn
• C) 21-gauge mn
• D) 22-gauge mn
Correct Answer: A mn mn
Explanation: In needle sizing, the smaller the gauge number, the larger the diameter (lumen) of the ne
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edle. An 18-gauge needle is larger than a 22-gauge needle.
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Question 3 mn
A phlebotomist is preparing to collect a Blood Culture specimen. What is the correct order of d
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raw for the bottles?
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• A) Aerobic bottle first, then Anaerobic bottle.
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• B) Anaerobic bottle first, then Aerobic bottle.
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• C) SPS (Yellow) tube first, then Blood Culture bottles.
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• D) The order does not matter as long as they are filled to the correct volume.
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Correct Answer: B mn mn
Explanation: When using a butterfly needle, the anaerobic bottle should be filled first to prevent air fr
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om entering the line. When using a regular straight needle, the aerobic bottle is often filled first to pre
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vent backflow. However, standard CLSI guidelines for syringe draws specify anaerobic first to avoid i
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ntroducing air. mn
Question 4 mn
What is the primary anticoagulant found in a Light Blue top tube, and what is its primary labo
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ratory use? mn
• A) EDTA; used for Hematology (CBC).
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• B) Sodium Heparin; used for Chemistry panels.
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• C) Sodium Citrate; used for Coagulation studies (PT/PTT).
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• D) Potassium Oxalate; used for Glucose testing.
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,Correct Answer: C mn mn
Explanation: The light blue top tube contains Sodium Citrate, which binds calcium to prevent clotting
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. It is specifically used for coagulation testing where the plasma must remain in its original state.
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Question 5 mn
The bevel of the needle should be facing which direction during a routine venipuncture?
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• A) Downward, parallel to the skin. mn mn mn mn mn
• B) Upward, away from the skin. mn mn mn mn mn
• C) Sideways, toward the patient's body.
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• D) Any direction is acceptable. mn mn mn mn
Correct Answer: B mn mn
Explanation: The bevel (the slanted opening of the needle) should be facing upward. This allows for t
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he smoothest entry into the vein with the least amount of trauma and pain for the patient.
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Question 6 mn
Which of the following is the BEST site for collecting a capillary sample on an infant?
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• A) The heel mn mn
• B) The great toe mn mn mn
• C) The index finger mn mn mn
• D) The earlobe mn mn
Correct Answer: A mn mn
Explanation: The heel is the recommended site for capillary puncture on infants under 1 year old bec
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ause they have not yet developed sufficient tissue in their fingers, and using the heel minimizes the ris
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k of bone injury.
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Question 7 mn
If a patient is fasting for a lipid panel, how long should they typically refrain from eating or dr
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inking anything other than water?
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• A) 2-4 hours mn mn
• B) 8-12 hours mn mn
• C) 16-20 hours mn mn
• D) 24 hours mn mn
Correct Answer: B mn mn
Explanation: A standard fasting period of 8- mn mn mn mn mn mn
12 hours is required for accurate lipid panel results (such as LDL and triglycerides) to avoid false elev
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ations caused by recent food intake.
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Question 8 mn
What is the first action a phlebotomist should take if they accidentally stick themselves with a u
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sed needle?mn
• A) Report the incident to the CDC. mn mn mn mn mn mn
• B) Complete an incident report immediately.
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• C) Wash the site with soap and water and seek immediate medical evaluation.
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• D) Squeeze the wound to express blood and apply a bandage.
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Correct Answer: C mn mn
Explanation: According to OSHA guidelines, the immediate action is to wash the affected area with s
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oap and water (or use an antiseptic), then immediately report the exposure to a supervisor and seek po
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st-exposure prophylaxis. mn
Question 9 mn
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,A phlebotomist notices that the patient has an IV line in the right arm. How should they procee
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d with the venipuncture?
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• A) Draw from the right arm below the IV site.
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• B) Use the left arm, unless contraindicated.
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• C) Draw from the right arm above the IV site.
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• D) Use the dorsum of the hand on the right arm.
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Correct Answer: B mn mn
Explanation: You should never draw blood from an arm with an active IV line due to the risk of cont
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
aminating the sample with the IV fluid. The preferred practice is to use the opposite arm (the left arm)
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if no other contraindications exist.
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Question 10 mn
What does "Hemolysis" refer to in a blood specimen?
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• A) The clotting of blood inside the tube.
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• B) The breakdown of red blood cells, releasing hemoglobin into the plasma/serum.
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• C) The separation of serum from the blood cells.
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• D) The formation of a fibrin clot. mn mn mn mn mn mn
Correct Answer: B mn mn
Explanation: Hemolysis occurs when red blood cells are damaged, releasing their contents (including
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hemoglobin) into the liquid portion of the blood. This can occur due to shaking the tube, using a small
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needle, or forcing the blood into the tube, and it often leads to specimen rejection.
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Question 11 mn
Which of the following is NOT a required component of a properly filled out laboratory requisi
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tion form? mn
• A) Patient's full name and date of birth.
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• B) Date and time of collection. mn mn mn mn mn
• C) Patient's Social Security Number.
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• D) Ordering physician's name. mn mn mn
Correct Answer: C mn mn
Explanation: While unique identifiers (like a medical record number) are required, a Social Security
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Number is rarely required for lab testing and may be protected under privacy laws.
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Question 12 mn
When preparing a peripheral blood smear from a capillary puncture, what should the phleboto
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mist do? mn
• A) Smear the blood using the first drop that appears.
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• B) Wipe away the first drop and use the second drop.
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• C) Scoop the blood from the skin surface using the spreader slide.
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• D) Apply a large drop of blood for an even smear.
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Correct Answer: B mn mn
Explanation: The first drop of capillary blood contains tissue fluid and may contain traces of alcohol,
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which can alter the results. It should be wiped away, and the second drop should be used for the smea
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r.
Question 13 mn
Which additive is found in a Green top tube?
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• A) Sodium Citrate mn mn
• B) Lithium Heparin mn mn
• C) Potassium EDTA mn mn
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, • D) Clot Activator
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Correct Answer: B mn mn
Explanation: Green top tubes contain Heparin (either sodium, lithium, or ammonium). It is used for c
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hemistry tests that require plasma. mn mn mn mn
Question 14 mn
A phlebotomist is using a 5 mL syringe and a 21-
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gauge needle. After drawing blood, what should they do?
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• A) Transfer the blood from the syringe to the tubes by pushing the plunger forcefully.
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• B) Let the blood flow from the needle hub into the tubes without pressure.
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• C) Use a safety transfer device to avoid needle stick injuries.
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• D) Recap the needle gently before transferring.
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Correct Answer: C mn mn
Explanation: It is unsafe to transfer blood by forcefully pushing the plunger as it can cause hemolysis
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. A safety transfer device (like a Luer-
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Lok connector) should be used to allow the vacuum of the tube to draw the blood from the syringe to
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prevent injury. mn
Question 15 mn
What position is a patient placed in to help prevent syncope (fainting)?
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• A) Prone position mn mn
• B) Lithotomy position mn mn
• C) Supine position (lying down flat) mn mn mn mn mn
• D) Sitting with legs dangling mn mn mn mn
Correct Answer: C mn mn
Explanation: Having a patient lie down (supine) prevents the blood from pooling in the lower extremi
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ties, which helps maintain adequate blood flow to the brain and reduces the risk of fainting.
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continue with question 16 to 100 mn mn mn mn mn
Here is the complete continuation of the NHCO Phlebotomy Practice Exam, featuring Questions 16 thr
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ough 100. Each question is followed by the correct answer and a brief explanation to reinforce key co
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ncepts.
Question 16 mn
Which of the following is the MOST common complication of venipuncture?
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• A) Hematoma mn
• B) Hemolysis mn
• C) Nerve damage mn mn
• D) Thrombophlebitis mn
Correct Answer: A mn mn
Explanation: A hematoma (bleeding under the skin) is the most frequent complication, usually caused
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by going through the vein, incomplete puncture, or failure to apply adequate pressure after needle rem
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oval.
Question 17 mn
What is the proper angle of insertion for a routine venipuncture using a straight needle?
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• A) 5 to 10 degrees mn mn mn mn
• B) 15 to 30 degrees mn mn mn mn
• C) 45 to 60 degrees mn mn mn mn
• D) 90 degrees mn mn
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FEATURING SOLVED QUESTIONS AND
ACCURACY CHECKED ANSWERS
NHCO Phlebotomy Certification Practice Exam
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Question 1 mn
Why is it important for a phlebotomist to verify the patient's identity before performing a venip
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uncture?
• A) To ensure the correct billing information is applied.
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• B) To comply with HIPAA regulations regarding patient privacy.
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• C) To guarantee the safety and accuracy of laboratory results for the correct patient.
mn mn mn mn mn mn mn mn mn mn mn mn mn
• D) To determine the patient's preferred language for communication.
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Correct Answer: C mn mn
Explanation: Patient identification is the single most critical step in phlebotomy to prevent mislabelin
mn mn mn mn mn mn mn mn mn mn mn mn mn
g and transfusion errors, which directly impacts patient safety and the accuracy of diagnostic testing.
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
Question 2 mn
Which of the following needle gauges has the LARGEST lumen (bore)?
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• A) 18-gauge mn
• B) 20-gauge mn
• C) 21-gauge mn
• D) 22-gauge mn
Correct Answer: A mn mn
Explanation: In needle sizing, the smaller the gauge number, the larger the diameter (lumen) of the ne
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
edle. An 18-gauge needle is larger than a 22-gauge needle.
mn mn mn mn mn mn mn mn mn
Question 3 mn
A phlebotomist is preparing to collect a Blood Culture specimen. What is the correct order of d
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
raw for the bottles?
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• A) Aerobic bottle first, then Anaerobic bottle.
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• B) Anaerobic bottle first, then Aerobic bottle.
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• C) SPS (Yellow) tube first, then Blood Culture bottles.
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• D) The order does not matter as long as they are filled to the correct volume.
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
Correct Answer: B mn mn
Explanation: When using a butterfly needle, the anaerobic bottle should be filled first to prevent air fr
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
om entering the line. When using a regular straight needle, the aerobic bottle is often filled first to pre
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
vent backflow. However, standard CLSI guidelines for syringe draws specify anaerobic first to avoid i
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
ntroducing air. mn
Question 4 mn
What is the primary anticoagulant found in a Light Blue top tube, and what is its primary labo
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ratory use? mn
• A) EDTA; used for Hematology (CBC).
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• B) Sodium Heparin; used for Chemistry panels.
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• C) Sodium Citrate; used for Coagulation studies (PT/PTT).
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• D) Potassium Oxalate; used for Glucose testing.
mn mn mn mn mn mn
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,Correct Answer: C mn mn
Explanation: The light blue top tube contains Sodium Citrate, which binds calcium to prevent clotting
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. It is specifically used for coagulation testing where the plasma must remain in its original state.
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Question 5 mn
The bevel of the needle should be facing which direction during a routine venipuncture?
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• A) Downward, parallel to the skin. mn mn mn mn mn
• B) Upward, away from the skin. mn mn mn mn mn
• C) Sideways, toward the patient's body.
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• D) Any direction is acceptable. mn mn mn mn
Correct Answer: B mn mn
Explanation: The bevel (the slanted opening of the needle) should be facing upward. This allows for t
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he smoothest entry into the vein with the least amount of trauma and pain for the patient.
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Question 6 mn
Which of the following is the BEST site for collecting a capillary sample on an infant?
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• A) The heel mn mn
• B) The great toe mn mn mn
• C) The index finger mn mn mn
• D) The earlobe mn mn
Correct Answer: A mn mn
Explanation: The heel is the recommended site for capillary puncture on infants under 1 year old bec
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ause they have not yet developed sufficient tissue in their fingers, and using the heel minimizes the ris
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k of bone injury.
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Question 7 mn
If a patient is fasting for a lipid panel, how long should they typically refrain from eating or dr
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
inking anything other than water?
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• A) 2-4 hours mn mn
• B) 8-12 hours mn mn
• C) 16-20 hours mn mn
• D) 24 hours mn mn
Correct Answer: B mn mn
Explanation: A standard fasting period of 8- mn mn mn mn mn mn
12 hours is required for accurate lipid panel results (such as LDL and triglycerides) to avoid false elev
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ations caused by recent food intake.
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Question 8 mn
What is the first action a phlebotomist should take if they accidentally stick themselves with a u
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sed needle?mn
• A) Report the incident to the CDC. mn mn mn mn mn mn
• B) Complete an incident report immediately.
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• C) Wash the site with soap and water and seek immediate medical evaluation.
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• D) Squeeze the wound to express blood and apply a bandage.
mn mn mn mn mn mn mn mn mn mn
Correct Answer: C mn mn
Explanation: According to OSHA guidelines, the immediate action is to wash the affected area with s
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
oap and water (or use an antiseptic), then immediately report the exposure to a supervisor and seek po
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
st-exposure prophylaxis. mn
Question 9 mn
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,A phlebotomist notices that the patient has an IV line in the right arm. How should they procee
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d with the venipuncture?
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• A) Draw from the right arm below the IV site.
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• B) Use the left arm, unless contraindicated.
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• C) Draw from the right arm above the IV site.
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• D) Use the dorsum of the hand on the right arm.
mn mn mn mn mn mn mn mn mn mn
Correct Answer: B mn mn
Explanation: You should never draw blood from an arm with an active IV line due to the risk of cont
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
aminating the sample with the IV fluid. The preferred practice is to use the opposite arm (the left arm)
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
if no other contraindications exist.
mn mn mn mn mn
Question 10 mn
What does "Hemolysis" refer to in a blood specimen?
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• A) The clotting of blood inside the tube.
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• B) The breakdown of red blood cells, releasing hemoglobin into the plasma/serum.
mn mn mn mn mn mn mn mn mn mn mn
• C) The separation of serum from the blood cells.
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• D) The formation of a fibrin clot. mn mn mn mn mn mn
Correct Answer: B mn mn
Explanation: Hemolysis occurs when red blood cells are damaged, releasing their contents (including
mn mn mn mn mn mn mn mn mn mn mn mn mn
hemoglobin) into the liquid portion of the blood. This can occur due to shaking the tube, using a small
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
needle, or forcing the blood into the tube, and it often leads to specimen rejection.
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
Question 11 mn
Which of the following is NOT a required component of a properly filled out laboratory requisi
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tion form? mn
• A) Patient's full name and date of birth.
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• B) Date and time of collection. mn mn mn mn mn
• C) Patient's Social Security Number.
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• D) Ordering physician's name. mn mn mn
Correct Answer: C mn mn
Explanation: While unique identifiers (like a medical record number) are required, a Social Security
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Number is rarely required for lab testing and may be protected under privacy laws.
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Question 12 mn
When preparing a peripheral blood smear from a capillary puncture, what should the phleboto
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mist do? mn
• A) Smear the blood using the first drop that appears.
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• B) Wipe away the first drop and use the second drop.
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• C) Scoop the blood from the skin surface using the spreader slide.
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• D) Apply a large drop of blood for an even smear.
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Correct Answer: B mn mn
Explanation: The first drop of capillary blood contains tissue fluid and may contain traces of alcohol,
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which can alter the results. It should be wiped away, and the second drop should be used for the smea
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r.
Question 13 mn
Which additive is found in a Green top tube?
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• A) Sodium Citrate mn mn
• B) Lithium Heparin mn mn
• C) Potassium EDTA mn mn
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, • D) Clot Activator
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Correct Answer: B mn mn
Explanation: Green top tubes contain Heparin (either sodium, lithium, or ammonium). It is used for c
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hemistry tests that require plasma. mn mn mn mn
Question 14 mn
A phlebotomist is using a 5 mL syringe and a 21-
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gauge needle. After drawing blood, what should they do?
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• A) Transfer the blood from the syringe to the tubes by pushing the plunger forcefully.
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• B) Let the blood flow from the needle hub into the tubes without pressure.
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• C) Use a safety transfer device to avoid needle stick injuries.
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• D) Recap the needle gently before transferring.
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Correct Answer: C mn mn
Explanation: It is unsafe to transfer blood by forcefully pushing the plunger as it can cause hemolysis
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. A safety transfer device (like a Luer-
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Lok connector) should be used to allow the vacuum of the tube to draw the blood from the syringe to
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prevent injury. mn
Question 15 mn
What position is a patient placed in to help prevent syncope (fainting)?
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• A) Prone position mn mn
• B) Lithotomy position mn mn
• C) Supine position (lying down flat) mn mn mn mn mn
• D) Sitting with legs dangling mn mn mn mn
Correct Answer: C mn mn
Explanation: Having a patient lie down (supine) prevents the blood from pooling in the lower extremi
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ties, which helps maintain adequate blood flow to the brain and reduces the risk of fainting.
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continue with question 16 to 100 mn mn mn mn mn
Here is the complete continuation of the NHCO Phlebotomy Practice Exam, featuring Questions 16 thr
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ough 100. Each question is followed by the correct answer and a brief explanation to reinforce key co
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ncepts.
Question 16 mn
Which of the following is the MOST common complication of venipuncture?
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• A) Hematoma mn
• B) Hemolysis mn
• C) Nerve damage mn mn
• D) Thrombophlebitis mn
Correct Answer: A mn mn
Explanation: A hematoma (bleeding under the skin) is the most frequent complication, usually caused
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by going through the vein, incomplete puncture, or failure to apply adequate pressure after needle rem
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oval.
Question 17 mn
What is the proper angle of insertion for a routine venipuncture using a straight needle?
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• A) 5 to 10 degrees mn mn mn mn
• B) 15 to 30 degrees mn mn mn mn
• C) 45 to 60 degrees mn mn mn mn
• D) 90 degrees mn mn
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