Certified Phlebotomy Technician (CPT) Exam 2026 |
Latest Verified Questions & Detailed Rationales
1. Which vein is the first choice for routine venipuncture?
A. Basilic vein
B. Cephalic vein
C. Median cubital vein
D. Dorsal hand vein
Correct Answer:
C. Median cubital vein
Rationale:
The median cubital vein is preferred because it is usually large, well anchored, and has a
lower risk of nerve injury. It is the safest and most stable vein for routine blood collection.
2. What is the correct order of draw during venipuncture?
A. Lavender, Green, Red, Gray
B. Blood cultures, Light blue, Red/SST, Green, Lavender, Gray
C. Green, Lavender, Light blue, Gray
D. Red, Blood cultures, Green, Lavender
Correct Answer:
B. Blood cultures, Light blue, Red/SST, Green, Lavender, Gray
Rationale:
The correct order prevents additive carryover that may contaminate specimens and alter
laboratory results.
3. Which additive is found in a lavender-top tube?
A. Sodium citrate
B. Heparin
C. EDTA
D. Potassium oxalate
Correct Answer:
C. EDTA
,Rationale:
Lavender tubes contain EDTA, which prevents clotting by binding calcium. They are
commonly used for hematology tests such as CBCs.
4. A phlebotomist should identify a patient using:
A. Room number only
B. Patient’s diagnosis
C. Two patient identifiers
D. Physician’s name
Correct Answer:
C. Two patient identifiers
Rationale:
Using two identifiers, such as full name and date of birth, reduces patient identification errors
and ensures specimen accuracy.
5. Which complication may occur if a tourniquet is left on too long?
A. Hemolysis
B. Hemoconcentration
C. Infection
D. Syncope
Correct Answer:
B. Hemoconcentration
Rationale:
Leaving the tourniquet on for more than one minute causes fluid shifts that concentrate blood
components and may alter test results.
6. What is the maximum recommended tourniquet application time?
A. 30 seconds
B. 1 minute
C. 2 minutes
D. 5 minutes
Correct Answer:
B. 1 minute
,Rationale:
Tourniquets should not remain in place longer than one minute to avoid hemoconcentration
and inaccurate results.
7. Which needle gauge is commonly used for routine adult venipuncture?
A. 14–16 gauge
B. 18–20 gauge
C. 21–22 gauge
D. 25–27 gauge
Correct Answer:
C. 21–22 gauge
Rationale:
A 21- or 22-gauge needle provides adequate blood flow while minimizing trauma to the vein.
8. Which action should be taken first if a patient faints during blood collection?
A. Continue the draw quickly
B. Remove the needle immediately
C. Ask the patient to stand
D. Leave the patient alone
Correct Answer:
B. Remove the needle immediately
Rationale:
Patient safety is the priority. The needle must be removed promptly to prevent injury.
9. What color tube is used for coagulation studies?
A. Green
B. Lavender
C. Gray
D. Light blue
Correct Answer:
D. Light blue
Rationale:
, Light blue tubes contain sodium citrate and are used for coagulation testing such as PT and
PTT.
10. Which organization establishes bloodborne pathogen standards?
A. CDC
B. OSHA
C. HIPAA
D. FDA
Correct Answer:
B. OSHA
Rationale:
OSHA establishes workplace safety standards, including bloodborne pathogen regulations for
healthcare workers.
11. What does hemolysis mean?
A. Clot formation
B. Breakdown of red blood cells
C. Increase in platelets
D. Bacterial contamination
Correct Answer:
B. Breakdown of red blood cells
Rationale:
Hemolysis occurs when red blood cells rupture, releasing intracellular contents that can
interfere with laboratory testing.
12. Which specimen requires protection from light?
A. Bilirubin
B. CBC
C. PT/INR
D. Blood culture
Correct Answer:
A. Bilirubin
Rationale:
Latest Verified Questions & Detailed Rationales
1. Which vein is the first choice for routine venipuncture?
A. Basilic vein
B. Cephalic vein
C. Median cubital vein
D. Dorsal hand vein
Correct Answer:
C. Median cubital vein
Rationale:
The median cubital vein is preferred because it is usually large, well anchored, and has a
lower risk of nerve injury. It is the safest and most stable vein for routine blood collection.
2. What is the correct order of draw during venipuncture?
A. Lavender, Green, Red, Gray
B. Blood cultures, Light blue, Red/SST, Green, Lavender, Gray
C. Green, Lavender, Light blue, Gray
D. Red, Blood cultures, Green, Lavender
Correct Answer:
B. Blood cultures, Light blue, Red/SST, Green, Lavender, Gray
Rationale:
The correct order prevents additive carryover that may contaminate specimens and alter
laboratory results.
3. Which additive is found in a lavender-top tube?
A. Sodium citrate
B. Heparin
C. EDTA
D. Potassium oxalate
Correct Answer:
C. EDTA
,Rationale:
Lavender tubes contain EDTA, which prevents clotting by binding calcium. They are
commonly used for hematology tests such as CBCs.
4. A phlebotomist should identify a patient using:
A. Room number only
B. Patient’s diagnosis
C. Two patient identifiers
D. Physician’s name
Correct Answer:
C. Two patient identifiers
Rationale:
Using two identifiers, such as full name and date of birth, reduces patient identification errors
and ensures specimen accuracy.
5. Which complication may occur if a tourniquet is left on too long?
A. Hemolysis
B. Hemoconcentration
C. Infection
D. Syncope
Correct Answer:
B. Hemoconcentration
Rationale:
Leaving the tourniquet on for more than one minute causes fluid shifts that concentrate blood
components and may alter test results.
6. What is the maximum recommended tourniquet application time?
A. 30 seconds
B. 1 minute
C. 2 minutes
D. 5 minutes
Correct Answer:
B. 1 minute
,Rationale:
Tourniquets should not remain in place longer than one minute to avoid hemoconcentration
and inaccurate results.
7. Which needle gauge is commonly used for routine adult venipuncture?
A. 14–16 gauge
B. 18–20 gauge
C. 21–22 gauge
D. 25–27 gauge
Correct Answer:
C. 21–22 gauge
Rationale:
A 21- or 22-gauge needle provides adequate blood flow while minimizing trauma to the vein.
8. Which action should be taken first if a patient faints during blood collection?
A. Continue the draw quickly
B. Remove the needle immediately
C. Ask the patient to stand
D. Leave the patient alone
Correct Answer:
B. Remove the needle immediately
Rationale:
Patient safety is the priority. The needle must be removed promptly to prevent injury.
9. What color tube is used for coagulation studies?
A. Green
B. Lavender
C. Gray
D. Light blue
Correct Answer:
D. Light blue
Rationale:
, Light blue tubes contain sodium citrate and are used for coagulation testing such as PT and
PTT.
10. Which organization establishes bloodborne pathogen standards?
A. CDC
B. OSHA
C. HIPAA
D. FDA
Correct Answer:
B. OSHA
Rationale:
OSHA establishes workplace safety standards, including bloodborne pathogen regulations for
healthcare workers.
11. What does hemolysis mean?
A. Clot formation
B. Breakdown of red blood cells
C. Increase in platelets
D. Bacterial contamination
Correct Answer:
B. Breakdown of red blood cells
Rationale:
Hemolysis occurs when red blood cells rupture, releasing intracellular contents that can
interfere with laboratory testing.
12. Which specimen requires protection from light?
A. Bilirubin
B. CBC
C. PT/INR
D. Blood culture
Correct Answer:
A. Bilirubin
Rationale:
