Phlebotomy Final Exam Prep| Questions And Correct
Answers (Verified Answers) Plus Rationales 2025 Q&A |
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1. Which vein is most commonly used for venipuncture?
A. Brachial
B. Median cubital
C. Basilic
D. Cephalic
The median cubital vein is the most commonly used because it is large,
close to the surface, and generally doesn't have major arteries or nerves
nearby.
2. What is the correct angle of insertion for a venipuncture needle?
A. 5 degrees
B. 15 degrees
C. 15–30 degrees
D. 45 degrees
The correct angle for inserting the needle is between 15 and 30 degrees to
minimize trauma and ensure access to the vein.
3. What is the additive in a lavender-top tube?
A. Sodium citrate
B. Heparin
C. EDTA
, D. No additive
EDTA is used in lavender tubes to prevent clotting by binding calcium in
the blood.
4. Which of the following must be done before collecting a blood specimen?
A. Shake the collection tubes
B. Identify the patient
C. Label the tubes later
D. Reuse a tourniquet
Proper patient identification is critical for ensuring specimen accuracy and
patient safety.
5. What is the best action if a hematoma starts to form during venipuncture?
A. Continue drawing
B. Remove the needle and apply pressure
C. Apply heat
D. Ignore it
Removing the needle and applying pressure stops bleeding under the skin
and reduces the size of the hematoma.
6. Which of the following tests requires the use of a chain of custody?
A. Blood glucose
B. Drug screening
C. Lipid panel
D. CBC
A drug screening test must follow chain of custody to ensure specimen
integrity and legal admissibility.
, 7. What is the maximum time a tourniquet should be left on?
A. 1 minute
B. 2 minutes
C. 1 minute
D. 5 minutes
A tourniquet should not be left on for more than one minute to avoid
hemoconcentration and inaccurate results.
8. Capillary punctures are typically performed on:
A. Fingers or heels
B. Arms
C. Wrists
D. Neck
Fingers (adults) and heels (infants) are preferred for capillary punctures
due to accessibility and safety.
9. Which color tube should be collected first in the order of draw?
A. Yellow
B. Red
C. Lavender
D. Green
The yellow tube (blood cultures) is drawn first to avoid contamination
from other additives.
10.Which of the following could cause hemolysis during a blood draw?
A. Using a large-gauge needle
B. Shaking the tube vigorously
Answers (Verified Answers) Plus Rationales 2025 Q&A |
Instant Download Pdf
1. Which vein is most commonly used for venipuncture?
A. Brachial
B. Median cubital
C. Basilic
D. Cephalic
The median cubital vein is the most commonly used because it is large,
close to the surface, and generally doesn't have major arteries or nerves
nearby.
2. What is the correct angle of insertion for a venipuncture needle?
A. 5 degrees
B. 15 degrees
C. 15–30 degrees
D. 45 degrees
The correct angle for inserting the needle is between 15 and 30 degrees to
minimize trauma and ensure access to the vein.
3. What is the additive in a lavender-top tube?
A. Sodium citrate
B. Heparin
C. EDTA
, D. No additive
EDTA is used in lavender tubes to prevent clotting by binding calcium in
the blood.
4. Which of the following must be done before collecting a blood specimen?
A. Shake the collection tubes
B. Identify the patient
C. Label the tubes later
D. Reuse a tourniquet
Proper patient identification is critical for ensuring specimen accuracy and
patient safety.
5. What is the best action if a hematoma starts to form during venipuncture?
A. Continue drawing
B. Remove the needle and apply pressure
C. Apply heat
D. Ignore it
Removing the needle and applying pressure stops bleeding under the skin
and reduces the size of the hematoma.
6. Which of the following tests requires the use of a chain of custody?
A. Blood glucose
B. Drug screening
C. Lipid panel
D. CBC
A drug screening test must follow chain of custody to ensure specimen
integrity and legal admissibility.
, 7. What is the maximum time a tourniquet should be left on?
A. 1 minute
B. 2 minutes
C. 1 minute
D. 5 minutes
A tourniquet should not be left on for more than one minute to avoid
hemoconcentration and inaccurate results.
8. Capillary punctures are typically performed on:
A. Fingers or heels
B. Arms
C. Wrists
D. Neck
Fingers (adults) and heels (infants) are preferred for capillary punctures
due to accessibility and safety.
9. Which color tube should be collected first in the order of draw?
A. Yellow
B. Red
C. Lavender
D. Green
The yellow tube (blood cultures) is drawn first to avoid contamination
from other additives.
10.Which of the following could cause hemolysis during a blood draw?
A. Using a large-gauge needle
B. Shaking the tube vigorously
