Orders and Equipment Selection Flashcards

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

Answer: Light blue

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

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

Answer: Heparinized syringe

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

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

Answer: A discard tube

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.

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

Answer: 21 gauge

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

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

Answer: To prevent blood from leaking when changing tubes

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.

Which collection device is most appropriate for a pediatric patient requiring a small blood volume from a hand vein?

Answer: Winged infusion set (butterfly) with 23-gauge needle

A winged infusion (butterfly) set with a 23-gauge needle is ideal for small or fragile veins such as those in the hand of a pediatric patient.