ASCP MLA 2027 EXAM PRACTICE BOOK
WITH ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS GRADED A+
1. A phlebotomist completes a venipuncture, applies pressure,
and bandages the site. Five minutes later, the patient notices
blood continuing to soak through the bandage. What is the
most appropriate next step?
A) Apply a tighter tourniquet above the site
B) Notify the patient's nurse immediately
C) Instruct the patient to walk around to increase circulation
D) Perform a second venipuncture on the opposite arm
Correct Answer: B) Notify the patient's nurse immediately
Rationale: Continuous bleeding five minutes post-venipuncture
indicates potential impaired hemostasis or vascular issues.
Notifying the patient's nurse ensures medical evaluation and
appropriate clinical intervention while maintaining patient safety.
2. A physician orders a Factor IX assay to evaluate a patient's
intrinsic coagulation pathway. Which vacutainer tube must be
selected for proper testing?
A) Lavender top
B) Light blue top
C) Dark green top
D) Red top
,Correct Answer: B) Light blue top
Rationale: Factor IX is a clotting factor evaluated via coagulation
assays. Light blue top tubes contain sodium citrate, which
preserves plasma coagulation factors by binding calcium.
3. A phlebotomist receives a requisition for a Vitamin A level
and a Complete Blood Count (CBC). Which tube
combination is required?
A) Gold top and lavender top
B) Light blue top and gray top
C) Dark blue top and green top
D) Red top and yellow top
Correct Answer: A) Gold top and lavender top
Rationale: Vitamin A testing requires serum separated by a gel
barrier (Gold top/SST), while a CBC requires EDTA whole blood
(Lavender top) to preserve cellular morphology.
4. When evaluating an obese patient for venipuncture, which
anatomical area should be palpated first for a suitable vein?
A) Dorsal surface of the wrist
B) Cephalic region of the forearm
C) Antecubital fossa
D) Basilic side of the wrist
Correct Answer: C) Antecubital fossa
Rationale: Although deep veins may be harder to feel in obese
patients, the antecubital fossa remains the primary site due to the
,presence of the median cubital vein, which is larger and anchored
better than peripheral options.
5. While inserting a venipuncture needle, the phlebotomist uses
an angle of insertion of 8 degrees. What complication is
most likely to occur?
A) The needle will pass completely through the posterior vein wall
B) The needle may enter above the vein without entering the
lumen
C) The needle will cause immediate arterial puncture
D) The needle will trigger rapid hematoma formation underneath
the vein
Correct Answer: B) The needle may enter above the vein without
entering the lumen
Rationale: Standard venipuncture insertion angles range
between 15 and 30 degrees. An insertion angle lower than 15
degrees (such as 8 degrees) risks sliding above the vein wall
rather than penetrating into the lumen.
6. Which blood collection tube utilizes a gel barrier to separate
fluid from clotted cellular components upon centrifugation?
A) EDTA tube
B) Serum Separator Tube (SST)
C) Sodium Heparin tube
D) Sodium Fluoride tube
Correct Answer: B) Serum Separator Tube (SST)
, Rationale: SSTs contain a clot activator and thixotropic gel
density barrier that moves to the interface between serum and the
blood clot during centrifugation.
7. A multi-tube blood draw requires a purple top, green top, and
light blue top. In what order should these tubes be filled to
prevent additive cross-contamination?
A) Purple, green, light blue
B) Light blue, green, purple
C) Green, purple, light blue
D) Light blue, purple, green
Correct Answer: B) Light blue, green, purple
Rationale: According to the standard order of draw, coagulation
tubes (light blue) are filled before heparin tubes (green), which are
filled before EDTA tubes (purple) to avoid anticoagulant
interference.
8. During a venipuncture procedure, the patient suddenly loses
consciousness. What immediate action must the
phlebotomist take?
A) Complete filling the current tube and call for help
B) Elevate the patient's arm above their head immediately
C) Remove the needle, activate the safety mechanism, and
attend to the patient
D) Slap the patient's cheeks gently to restore responsiveness
Correct Answer: C) Remove the needle, activate the safety
mechanism, and attend to the patient
WITH ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS GRADED A+
1. A phlebotomist completes a venipuncture, applies pressure,
and bandages the site. Five minutes later, the patient notices
blood continuing to soak through the bandage. What is the
most appropriate next step?
A) Apply a tighter tourniquet above the site
B) Notify the patient's nurse immediately
C) Instruct the patient to walk around to increase circulation
D) Perform a second venipuncture on the opposite arm
Correct Answer: B) Notify the patient's nurse immediately
Rationale: Continuous bleeding five minutes post-venipuncture
indicates potential impaired hemostasis or vascular issues.
Notifying the patient's nurse ensures medical evaluation and
appropriate clinical intervention while maintaining patient safety.
2. A physician orders a Factor IX assay to evaluate a patient's
intrinsic coagulation pathway. Which vacutainer tube must be
selected for proper testing?
A) Lavender top
B) Light blue top
C) Dark green top
D) Red top
,Correct Answer: B) Light blue top
Rationale: Factor IX is a clotting factor evaluated via coagulation
assays. Light blue top tubes contain sodium citrate, which
preserves plasma coagulation factors by binding calcium.
3. A phlebotomist receives a requisition for a Vitamin A level
and a Complete Blood Count (CBC). Which tube
combination is required?
A) Gold top and lavender top
B) Light blue top and gray top
C) Dark blue top and green top
D) Red top and yellow top
Correct Answer: A) Gold top and lavender top
Rationale: Vitamin A testing requires serum separated by a gel
barrier (Gold top/SST), while a CBC requires EDTA whole blood
(Lavender top) to preserve cellular morphology.
4. When evaluating an obese patient for venipuncture, which
anatomical area should be palpated first for a suitable vein?
A) Dorsal surface of the wrist
B) Cephalic region of the forearm
C) Antecubital fossa
D) Basilic side of the wrist
Correct Answer: C) Antecubital fossa
Rationale: Although deep veins may be harder to feel in obese
patients, the antecubital fossa remains the primary site due to the
,presence of the median cubital vein, which is larger and anchored
better than peripheral options.
5. While inserting a venipuncture needle, the phlebotomist uses
an angle of insertion of 8 degrees. What complication is
most likely to occur?
A) The needle will pass completely through the posterior vein wall
B) The needle may enter above the vein without entering the
lumen
C) The needle will cause immediate arterial puncture
D) The needle will trigger rapid hematoma formation underneath
the vein
Correct Answer: B) The needle may enter above the vein without
entering the lumen
Rationale: Standard venipuncture insertion angles range
between 15 and 30 degrees. An insertion angle lower than 15
degrees (such as 8 degrees) risks sliding above the vein wall
rather than penetrating into the lumen.
6. Which blood collection tube utilizes a gel barrier to separate
fluid from clotted cellular components upon centrifugation?
A) EDTA tube
B) Serum Separator Tube (SST)
C) Sodium Heparin tube
D) Sodium Fluoride tube
Correct Answer: B) Serum Separator Tube (SST)
, Rationale: SSTs contain a clot activator and thixotropic gel
density barrier that moves to the interface between serum and the
blood clot during centrifugation.
7. A multi-tube blood draw requires a purple top, green top, and
light blue top. In what order should these tubes be filled to
prevent additive cross-contamination?
A) Purple, green, light blue
B) Light blue, green, purple
C) Green, purple, light blue
D) Light blue, purple, green
Correct Answer: B) Light blue, green, purple
Rationale: According to the standard order of draw, coagulation
tubes (light blue) are filled before heparin tubes (green), which are
filled before EDTA tubes (purple) to avoid anticoagulant
interference.
8. During a venipuncture procedure, the patient suddenly loses
consciousness. What immediate action must the
phlebotomist take?
A) Complete filling the current tube and call for help
B) Elevate the patient's arm above their head immediately
C) Remove the needle, activate the safety mechanism, and
attend to the patient
D) Slap the patient's cheeks gently to restore responsiveness
Correct Answer: C) Remove the needle, activate the safety
mechanism, and attend to the patient
