ASCP Orders and Equipment Selection 2

Question 1

Which tube stopper color contains sodium citrate as the anticoagulant and is primarily used for coagulation studies?

Accepted Answer

Light blue

Answer

Light blue-topped tubes contain sodium citrate (3.2%) and are the standard tubes for coagulation testing such as PT and aPTT.

Question 2

A phlebotomist needs to collect blood for a blood gas analysis. Which of the following syringes or tubes should be selected?

Accepted Answer

Heparinized syringe

Answer

Arterial blood gas (ABG) specimens are collected using heparinized syringes to prevent clotting while not interfering with pH or gas measurements.

Question 3

When using a winged blood collection (butterfly) set, what is the first tube in the order of draw if coagulation tests are ordered?

Accepted Answer

A discard tube

Answer

With butterfly sets, a discard tube must be drawn first to fill the dead space in the tubing and prevent short-filling the coagulation tube, which would alter the blood-to-anticoagulant ratio.

Question 4

Which needle gauge is most commonly used for routine adult venipuncture?

Accepted Answer

21 gauge

Answer

A 21-gauge needle is standard for routine adult venipuncture, providing an adequate flow rate while minimizing discomfort and hemolysis risk.

Question 5

What is the purpose of the rubber sleeve inside an evacuated tube holder?

Accepted Answer

To prevent blood from leaking when changing tubes

Answer

The rubber sleeve in the tube holder covers the internal needle and prevents blood from leaking into the holder when tubes are removed and exchanged during multi-tube collection.

ASCP Phlebotomy Technician Exam Practice Test

ASCP Phlebotomy Technician Exam Practice Test

ASCP Orders and Equipment Selection 2