1|Page
MEDCA PHLEBOTOMY EXAM 2026-2027 BANK QUESTIONS
WITH DETAILED VERIFIED ANSWERS EXAM QUESTIONS
WILL COME FROM HERE (100% CORRECT ANSWERS A+
GRADED
1. The single most important step in phlebotomy to prevent nosocomial
infections is:
A. Proper tourniquet application
B. Thorough hand hygiene
C. Wearing clean gloves
D. Double-checking patient identification
Answer: B. Thorough hand hygiene. While all options represent safety
measures, hand hygiene is the universal foundation of infection control,
mechanically removing transient flora that cause healthcare-associated
(nosocomial) infections.
2. Which of the following is the proper order of draw for evacuated
tubes?
A. Red, Blue, Green, Lavender
B. Blood culture, Light blue, Red/Gold, Green, Lavender, Gray
C. Lavender, Green, Red, Blue
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D. Gray, Lavender, Green, Red, Blood culture
Answer: B. Blood culture, Light blue, Red/Gold, Green, Lavender, Gray.
This sequence prevents cross-contamination of additives that would
skew laboratory results; blood cultures are sterile, citrate tubes (blue)
have a specific ratio, and EDTA (lavender) is drawn last among routine
tubes to avoid interfering with coagulation and chemistry tests.
4. The basilic vein is located on the:
A. Lateral aspect of the antecubital fossa
B. Medial aspect of the antecubital fossa
C. Dorsum of the hand
D. Anterior wrist over the radial bone
Answer: B. Medial aspect of the antecubital fossa. The basilic vein runs
along the medial (ulnar) side of the forearm and is the closest major
vein to the median nerve and brachial artery, necessitating extra
caution during venipuncture.
5. A patient's requisition form is missing a test. The phlebotomist
should:
A. Draw the test the patient thinks they need
B. Call the floor to add the test, but draw the listed tests first
C. Verify the order with the requesting physician or nursing unit before
drawing
D. Leave the tube unlabeled until the test is clarified
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Answer: C. Verify the order with the requesting physician or nursing
unit before drawing. Drawing unauthorized tests constitutes battery
and healthcare fraud; the legal chain of delegation requires a valid
provider order.
6. If a patient faints during venipuncture, the immediate first action is
to:
A. Apply cold compresses to the forehead
B. Remove the tourniquet and needle, then call for help
C. Complete the draw quickly
D. Administer ammonia inhalants
Answer: B. Remove the tourniquet and needle, then call for help. Safety
for the patient and provider requires terminating the procedure to
prevent injury from the indwelling needle during convulsive syncope or
a fall.
7. Which additive is present in a light blue top tube?
A. EDTA
B. Sodium citrate
C. Lithium heparin
D. Potassium oxalate
Answer: B. Sodium citrate. Sodium citrate reversibly binds calcium to
prevent clotting, preserving coagulation factors for PT and PTT assays.
The 9:1 blood-to-additive ratio is critical for accurate results.
, 4|Page
9. Hemolysis of a blood sample will most significantly elevate which
analyte?
A. Glucose
B. Potassium
C. Sodium
D. Bilirubin
Answer: B. Potassium. Erythrocytes contain intracellular potassium
concentrations roughly 25 times higher than plasma; rupture of red
cells releases this potassium, creating a spurious hyperkalemia that can
lead to critical misdiagnosis.
10. A glucose tolerance test requires:
A. A fasting urine sample
B. Multiple timed blood draws after fasting
C. A random blood draw
D. A single postprandial draw
Answer: B. Multiple timed blood draws after fasting. The GTT evaluates
metabolic response over time, typically requiring a fasting baseline
followed by draws at 1, 2, and sometimes 3 hours post-glucose
challenge to map the clearance curve.
11. The primary function of platelets is:
A. Carrying oxygen
B. Phagocytosis of bacteria
MEDCA PHLEBOTOMY EXAM 2026-2027 BANK QUESTIONS
WITH DETAILED VERIFIED ANSWERS EXAM QUESTIONS
WILL COME FROM HERE (100% CORRECT ANSWERS A+
GRADED
1. The single most important step in phlebotomy to prevent nosocomial
infections is:
A. Proper tourniquet application
B. Thorough hand hygiene
C. Wearing clean gloves
D. Double-checking patient identification
Answer: B. Thorough hand hygiene. While all options represent safety
measures, hand hygiene is the universal foundation of infection control,
mechanically removing transient flora that cause healthcare-associated
(nosocomial) infections.
2. Which of the following is the proper order of draw for evacuated
tubes?
A. Red, Blue, Green, Lavender
B. Blood culture, Light blue, Red/Gold, Green, Lavender, Gray
C. Lavender, Green, Red, Blue
,2|Page
D. Gray, Lavender, Green, Red, Blood culture
Answer: B. Blood culture, Light blue, Red/Gold, Green, Lavender, Gray.
This sequence prevents cross-contamination of additives that would
skew laboratory results; blood cultures are sterile, citrate tubes (blue)
have a specific ratio, and EDTA (lavender) is drawn last among routine
tubes to avoid interfering with coagulation and chemistry tests.
4. The basilic vein is located on the:
A. Lateral aspect of the antecubital fossa
B. Medial aspect of the antecubital fossa
C. Dorsum of the hand
D. Anterior wrist over the radial bone
Answer: B. Medial aspect of the antecubital fossa. The basilic vein runs
along the medial (ulnar) side of the forearm and is the closest major
vein to the median nerve and brachial artery, necessitating extra
caution during venipuncture.
5. A patient's requisition form is missing a test. The phlebotomist
should:
A. Draw the test the patient thinks they need
B. Call the floor to add the test, but draw the listed tests first
C. Verify the order with the requesting physician or nursing unit before
drawing
D. Leave the tube unlabeled until the test is clarified
,3|Page
Answer: C. Verify the order with the requesting physician or nursing
unit before drawing. Drawing unauthorized tests constitutes battery
and healthcare fraud; the legal chain of delegation requires a valid
provider order.
6. If a patient faints during venipuncture, the immediate first action is
to:
A. Apply cold compresses to the forehead
B. Remove the tourniquet and needle, then call for help
C. Complete the draw quickly
D. Administer ammonia inhalants
Answer: B. Remove the tourniquet and needle, then call for help. Safety
for the patient and provider requires terminating the procedure to
prevent injury from the indwelling needle during convulsive syncope or
a fall.
7. Which additive is present in a light blue top tube?
A. EDTA
B. Sodium citrate
C. Lithium heparin
D. Potassium oxalate
Answer: B. Sodium citrate. Sodium citrate reversibly binds calcium to
prevent clotting, preserving coagulation factors for PT and PTT assays.
The 9:1 blood-to-additive ratio is critical for accurate results.
, 4|Page
9. Hemolysis of a blood sample will most significantly elevate which
analyte?
A. Glucose
B. Potassium
C. Sodium
D. Bilirubin
Answer: B. Potassium. Erythrocytes contain intracellular potassium
concentrations roughly 25 times higher than plasma; rupture of red
cells releases this potassium, creating a spurious hyperkalemia that can
lead to critical misdiagnosis.
10. A glucose tolerance test requires:
A. A fasting urine sample
B. Multiple timed blood draws after fasting
C. A random blood draw
D. A single postprandial draw
Answer: B. Multiple timed blood draws after fasting. The GTT evaluates
metabolic response over time, typically requiring a fasting baseline
followed by draws at 1, 2, and sometimes 3 hours post-glucose
challenge to map the clearance curve.
11. The primary function of platelets is:
A. Carrying oxygen
B. Phagocytosis of bacteria
