PCT NHA EXAM WITH 100%
CORRECT ANSWERS 2026/2027
LATEST GRADED A+
1. Question: Which anticoagulant is commonly used in a lavender-top
blood collection tube?
Choices:
A. Sodium citrate
B. EDTA
C. Heparin
D. Sodium fluoride
CORRECT ANSWER: B. EDTA
Explanation: Lavender-top tubes contain EDTA, which binds
calcium and prevents clotting, making them appropriate for
hematology testing.
2. Question: Which additive is found in a gray-top blood collection
tube?
Choices:
A. EDTA
B. Heparin
C. Potassium oxalate/sodium fluoride
D. Sodium citrate
, CORRECT ANSWER: C. Potassium oxalate/sodium fluoride
Explanation: Gray-top tubes commonly contain an antiglycolytic
agent such as sodium fluoride and an anticoagulant such as
potassium oxalate, helping preserve glucose levels.
3. Question: Which needle has the largest diameter?
Choices:
A. 16 gauge
B. 20 gauge
C. 21 gauge
D. 25 gauge
CORRECT ANSWER: A. 16 gauge
Explanation: Needle gauge is inversely related to diameter. A
lower gauge number indicates a larger needle diameter.
4. Question: What type of blood-collection device consists of a needle
attached to flexible plastic tubing?
Choices:
A. Syringe
B. Winged infusion set
C. Lancet
D. Safety needle
CORRECT ANSWER: B. Winged infusion set
Explanation: A winged infusion set, often called a butterfly, has a
short needle connected to flexible tubing and is useful for difficult or
fragile veins.
,5. Question: What needle gauge is commonly used for routine adult
venipuncture?
Choices:
A. 16 gauge
B. 18 gauge
C. 21 gauge
D. 25 gauge
CORRECT ANSWER: C. 21 gauge
Explanation: A 21-gauge needle is commonly used for routine
adult venipuncture because it provides an appropriate balance
between blood flow and minimizing tissue trauma.
6. Question: Which statement about winged infusion sets is incorrect?
Choices:
A. They are useful for difficult veins.
B. They contain flexible tubing.
C. They are available in small needle sizes.
D. They commonly come in 16- and 18-gauge sizes.
CORRECT ANSWER: D. They commonly come in 16- and 18-
gauge sizes.
Explanation: Winged infusion sets are generally available in
smaller gauges appropriate for delicate or difficult veins rather than
the very large 16- or 18-gauge sizes.
7. Question: A patient reports taking medication with orange juice
before a fasting blood glucose test. What should the healthcare
, worker do?
Choices:
A. Draw the specimen anyway.
B. Cancel the test permanently.
C. Explain the issue and consult the physician/provider before
collecting the specimen.
D. Have the patient drink more orange juice.
CORRECT ANSWER: C. Explain the issue and consult the
physician/provider before collecting the specimen.
Explanation: Food, beverages, and medications may affect fasting
laboratory results. The provider should determine whether the test
should proceed or be rescheduled.
8. Question: Which action is incorrect when performing a dermal
puncture?
Choices:
A. Clean the puncture site.
B. Allow the site to dry.
C. Collect the first drop of blood.
D. Use an appropriate lancet.
CORRECT ANSWER: C. Collect the first drop of blood.
Explanation: The first drop may contain tissue fluid or
contaminants. It is generally wiped away before collecting the
specimen.
CORRECT ANSWERS 2026/2027
LATEST GRADED A+
1. Question: Which anticoagulant is commonly used in a lavender-top
blood collection tube?
Choices:
A. Sodium citrate
B. EDTA
C. Heparin
D. Sodium fluoride
CORRECT ANSWER: B. EDTA
Explanation: Lavender-top tubes contain EDTA, which binds
calcium and prevents clotting, making them appropriate for
hematology testing.
2. Question: Which additive is found in a gray-top blood collection
tube?
Choices:
A. EDTA
B. Heparin
C. Potassium oxalate/sodium fluoride
D. Sodium citrate
, CORRECT ANSWER: C. Potassium oxalate/sodium fluoride
Explanation: Gray-top tubes commonly contain an antiglycolytic
agent such as sodium fluoride and an anticoagulant such as
potassium oxalate, helping preserve glucose levels.
3. Question: Which needle has the largest diameter?
Choices:
A. 16 gauge
B. 20 gauge
C. 21 gauge
D. 25 gauge
CORRECT ANSWER: A. 16 gauge
Explanation: Needle gauge is inversely related to diameter. A
lower gauge number indicates a larger needle diameter.
4. Question: What type of blood-collection device consists of a needle
attached to flexible plastic tubing?
Choices:
A. Syringe
B. Winged infusion set
C. Lancet
D. Safety needle
CORRECT ANSWER: B. Winged infusion set
Explanation: A winged infusion set, often called a butterfly, has a
short needle connected to flexible tubing and is useful for difficult or
fragile veins.
,5. Question: What needle gauge is commonly used for routine adult
venipuncture?
Choices:
A. 16 gauge
B. 18 gauge
C. 21 gauge
D. 25 gauge
CORRECT ANSWER: C. 21 gauge
Explanation: A 21-gauge needle is commonly used for routine
adult venipuncture because it provides an appropriate balance
between blood flow and minimizing tissue trauma.
6. Question: Which statement about winged infusion sets is incorrect?
Choices:
A. They are useful for difficult veins.
B. They contain flexible tubing.
C. They are available in small needle sizes.
D. They commonly come in 16- and 18-gauge sizes.
CORRECT ANSWER: D. They commonly come in 16- and 18-
gauge sizes.
Explanation: Winged infusion sets are generally available in
smaller gauges appropriate for delicate or difficult veins rather than
the very large 16- or 18-gauge sizes.
7. Question: A patient reports taking medication with orange juice
before a fasting blood glucose test. What should the healthcare
, worker do?
Choices:
A. Draw the specimen anyway.
B. Cancel the test permanently.
C. Explain the issue and consult the physician/provider before
collecting the specimen.
D. Have the patient drink more orange juice.
CORRECT ANSWER: C. Explain the issue and consult the
physician/provider before collecting the specimen.
Explanation: Food, beverages, and medications may affect fasting
laboratory results. The provider should determine whether the test
should proceed or be rescheduled.
8. Question: Which action is incorrect when performing a dermal
puncture?
Choices:
A. Clean the puncture site.
B. Allow the site to dry.
C. Collect the first drop of blood.
D. Use an appropriate lancet.
CORRECT ANSWER: C. Collect the first drop of blood.
Explanation: The first drop may contain tissue fluid or
contaminants. It is generally wiped away before collecting the
specimen.
