ASCP PBT PHLEBOTOMY TECHNICIAN EXAM |
ALL PRACTICE Q&A 2026/2027 | A+ GRADED |
COMPREHENSIVE EXAM GUIDE 2026&2027
1. Which blood vessel is the preferred site for routine adult venipuncture because it is
generally large, well anchored, and less likely to be near major nerves?
A. Basilic vein
B. Median cubital vein
C. Radial artery
D. Cephalic artery
Answer: B
The median cubital vein is commonly preferred because it is usually prominent, relatively well
anchored, and has fewer major nerves and arteries immediately adjacent to it than some
alternative sites.
2. A patient asks why serum and plasma are different specimens. Which response is most
accurate?
A. Serum contains anticoagulant while plasma does not
B. Plasma is obtained only from capillary blood
C. Serum is the liquid portion remaining after blood has clotted
D. Serum contains more clotting factors than plasma
Answer: C
Serum is the liquid portion obtained after clot formation and therefore lacks most clotting
factors consumed during coagulation. Plasma is obtained from anticoagulated blood and
retains clotting factors.
3. Which formed element of blood is primarily responsible for oxygen transport?
A. Erythrocytes
B. Platelets
C. Leukocytes
D. Monocytes
Answer: A
Erythrocytes contain hemoglobin, which binds and transports oxygen throughout the body.
4. A patient becomes pale and says, “I feel like I am going to faint,” immediately after
needle insertion. What should the phlebotomist do first?
A. Continue the collection rapidly
,B. Ask the patient to stand
C. Remove the tourniquet only
D. Remove the needle and protect the patient from injury
Answer: D
Patient safety takes priority. The collection should be stopped, the needle removed safely,
and the patient protected from falling or injury.
5. Which tube is typically used for coagulation studies such as PT and aPTT?
A. Lavender-top tube
B. Light-blue-top tube
C. Gray-top tube
D. Green-top tube
Answer: B
Light-blue-top tubes contain sodium citrate and are used for coagulation testing because the
anticoagulant preserves the blood-to-anticoagulant ratio required for accurate testing.
6. What is the primary purpose of an anticoagulant in a blood collection tube?
A. To prevent clot formation
B. To increase hemolysis
C. To separate serum immediately
D. To destroy platelets
Answer: A
Anticoagulants prevent coagulation so that plasma or intact cellular components can be
appropriately analyzed.
7. A patient has an intravenous infusion running in the right arm and a suitable vein is
available in the left arm. What is the preferred action?
A. Draw directly above the IV
B. Draw through the IV tubing
C. Use the unaffected arm when possible
D. Stop the IV without authorization
Answer: C
Using the arm without the infusion reduces the risk of collecting a diluted or contaminated
specimen and avoids unnecessary interference with patient therapy.
8. Which action best verifies patient identity before venipuncture?
A. Ask the patient to state identifying information and compare it with the identification band
and order
,B. Ask a family member to identify the patient
C. Confirm the patient's room number only
D. Match the patient's appearance to the requisition
Answer: A
Positive identification requires reliable identifiers and comparison with the test order. Room
number or appearance alone is insufficient.
9. Which situation most directly increases the risk of hemolysis during venipuncture?
A. Allowing alcohol to dry
B. Using an appropriate needle size
C. Gently mixing additive tubes
D. Vigorous shaking of collected tubes
Answer: D
Vigorous shaking can mechanically damage red blood cells and cause hemolysis. Additive
tubes should be gently inverted according to laboratory requirements.
10. Why should antiseptic be allowed to dry before needle insertion?
A. It increases blood pressure
B. It improves platelet function
C. It reduces contamination and minimizes stinging
D. It prevents clotting in the tube
Answer: C
Allowing the antiseptic to dry helps reduce microbial contamination and decreases the
likelihood of discomfort caused by introducing wet alcohol into the puncture site.
11. Which additive is found in a lavender-top tube?
A. EDTA
B. Sodium citrate
C. Sodium fluoride
D. Heparin
Answer: A
Lavender-top tubes contain EDTA, which preserves cellular morphology and is commonly used
for hematology testing.
12. A patient has a history of bilateral mastectomy. What should the phlebotomist do
before selecting an arm for venipuncture?
A. Always use the dominant arm
B. Follow facility policy and seek appropriate clinical guidance
, C. Draw from the side with the most visible vein
D. Use only the hand without asking anyone
Answer: B
Lymphatic disruption may affect venipuncture-site selection. The phlebotomist should follow
institutional policy and obtain appropriate guidance rather than making an unsupported
assumption.
13. Which vein is generally considered a secondary choice when the median cubital vein is
unsuitable?
A. Femoral vein
B. Jugular vein
C. Cephalic vein
D. Radial artery
Answer: C
The cephalic vein is commonly used as an alternative when the median cubital vein is
unavailable or unsuitable.
14. What is the principal purpose of a tourniquet during venipuncture?
A. To sterilize the site
B. To increase venous distention
C. To prevent platelet activation
D. To stop arterial circulation
Answer: B
A tourniquet temporarily restricts venous return, causing veins to become more prominent
and easier to access.
15. A patient has a hematoma developing during collection. What is the most appropriate
immediate action?
A. Continue until the tube is full
B. Increase the tourniquet pressure
C. Remove the needle, release the tourniquet, and apply pressure
D. Massage the area vigorously
Answer: C
A developing hematoma indicates blood is escaping into surrounding tissue. The collection
should be stopped and pressure applied after removing the needle and releasing the
tourniquet.
ALL PRACTICE Q&A 2026/2027 | A+ GRADED |
COMPREHENSIVE EXAM GUIDE 2026&2027
1. Which blood vessel is the preferred site for routine adult venipuncture because it is
generally large, well anchored, and less likely to be near major nerves?
A. Basilic vein
B. Median cubital vein
C. Radial artery
D. Cephalic artery
Answer: B
The median cubital vein is commonly preferred because it is usually prominent, relatively well
anchored, and has fewer major nerves and arteries immediately adjacent to it than some
alternative sites.
2. A patient asks why serum and plasma are different specimens. Which response is most
accurate?
A. Serum contains anticoagulant while plasma does not
B. Plasma is obtained only from capillary blood
C. Serum is the liquid portion remaining after blood has clotted
D. Serum contains more clotting factors than plasma
Answer: C
Serum is the liquid portion obtained after clot formation and therefore lacks most clotting
factors consumed during coagulation. Plasma is obtained from anticoagulated blood and
retains clotting factors.
3. Which formed element of blood is primarily responsible for oxygen transport?
A. Erythrocytes
B. Platelets
C. Leukocytes
D. Monocytes
Answer: A
Erythrocytes contain hemoglobin, which binds and transports oxygen throughout the body.
4. A patient becomes pale and says, “I feel like I am going to faint,” immediately after
needle insertion. What should the phlebotomist do first?
A. Continue the collection rapidly
,B. Ask the patient to stand
C. Remove the tourniquet only
D. Remove the needle and protect the patient from injury
Answer: D
Patient safety takes priority. The collection should be stopped, the needle removed safely,
and the patient protected from falling or injury.
5. Which tube is typically used for coagulation studies such as PT and aPTT?
A. Lavender-top tube
B. Light-blue-top tube
C. Gray-top tube
D. Green-top tube
Answer: B
Light-blue-top tubes contain sodium citrate and are used for coagulation testing because the
anticoagulant preserves the blood-to-anticoagulant ratio required for accurate testing.
6. What is the primary purpose of an anticoagulant in a blood collection tube?
A. To prevent clot formation
B. To increase hemolysis
C. To separate serum immediately
D. To destroy platelets
Answer: A
Anticoagulants prevent coagulation so that plasma or intact cellular components can be
appropriately analyzed.
7. A patient has an intravenous infusion running in the right arm and a suitable vein is
available in the left arm. What is the preferred action?
A. Draw directly above the IV
B. Draw through the IV tubing
C. Use the unaffected arm when possible
D. Stop the IV without authorization
Answer: C
Using the arm without the infusion reduces the risk of collecting a diluted or contaminated
specimen and avoids unnecessary interference with patient therapy.
8. Which action best verifies patient identity before venipuncture?
A. Ask the patient to state identifying information and compare it with the identification band
and order
,B. Ask a family member to identify the patient
C. Confirm the patient's room number only
D. Match the patient's appearance to the requisition
Answer: A
Positive identification requires reliable identifiers and comparison with the test order. Room
number or appearance alone is insufficient.
9. Which situation most directly increases the risk of hemolysis during venipuncture?
A. Allowing alcohol to dry
B. Using an appropriate needle size
C. Gently mixing additive tubes
D. Vigorous shaking of collected tubes
Answer: D
Vigorous shaking can mechanically damage red blood cells and cause hemolysis. Additive
tubes should be gently inverted according to laboratory requirements.
10. Why should antiseptic be allowed to dry before needle insertion?
A. It increases blood pressure
B. It improves platelet function
C. It reduces contamination and minimizes stinging
D. It prevents clotting in the tube
Answer: C
Allowing the antiseptic to dry helps reduce microbial contamination and decreases the
likelihood of discomfort caused by introducing wet alcohol into the puncture site.
11. Which additive is found in a lavender-top tube?
A. EDTA
B. Sodium citrate
C. Sodium fluoride
D. Heparin
Answer: A
Lavender-top tubes contain EDTA, which preserves cellular morphology and is commonly used
for hematology testing.
12. A patient has a history of bilateral mastectomy. What should the phlebotomist do
before selecting an arm for venipuncture?
A. Always use the dominant arm
B. Follow facility policy and seek appropriate clinical guidance
, C. Draw from the side with the most visible vein
D. Use only the hand without asking anyone
Answer: B
Lymphatic disruption may affect venipuncture-site selection. The phlebotomist should follow
institutional policy and obtain appropriate guidance rather than making an unsupported
assumption.
13. Which vein is generally considered a secondary choice when the median cubital vein is
unsuitable?
A. Femoral vein
B. Jugular vein
C. Cephalic vein
D. Radial artery
Answer: C
The cephalic vein is commonly used as an alternative when the median cubital vein is
unavailable or unsuitable.
14. What is the principal purpose of a tourniquet during venipuncture?
A. To sterilize the site
B. To increase venous distention
C. To prevent platelet activation
D. To stop arterial circulation
Answer: B
A tourniquet temporarily restricts venous return, causing veins to become more prominent
and easier to access.
15. A patient has a hematoma developing during collection. What is the most appropriate
immediate action?
A. Continue until the tube is full
B. Increase the tourniquet pressure
C. Remove the needle, release the tourniquet, and apply pressure
D. Massage the area vigorously
Answer: C
A developing hematoma indicates blood is escaping into surrounding tissue. The collection
should be stopped and pressure applied after removing the needle and releasing the
tourniquet.
