NAPTP Specimen Processing and Handling 3

Question 1

Which temperature range is appropriate for storing most serum chemistry specimens awaiting testing?

Accepted Answer

Refrigerated at 2–8°C

Answer

Most serum chemistry specimens can be stored at 2–8°C (refrigerated) to slow enzymatic degradation while awaiting analysis.

Question 2

A clotted specimen is submitted in a lavender (EDTA) tube. What should the phlebotomist do?

Accepted Answer

Reject the specimen and collect a new one

Answer

A clotted EDTA specimen cannot be used for hematology testing because platelets and cells are trapped in the clot, making cell counts inaccurate; a recollection is required.

Question 3

How many times should a tube with an anticoagulant additive be inverted after collection?

Accepted Answer

8–10 times gently

Answer

Anticoagulant tubes should be gently inverted 8–10 times to thoroughly mix the additive with blood without causing hemolysis.

Question 4

Which of the following specimens is most stable and can be stored at room temperature for the longest time before testing?

Accepted Answer

Urinalysis dipstick

Answer

A urinalysis dipstick specimen is relatively stable at room temperature for up to 2 hours, whereas ABG, ammonia, and glucose without preservative degrade rapidly.

Question 5

What does 'chain of custody' mean in the context of specimen handling?

Accepted Answer

A documented, unbroken record of specimen possession from collection to testing

Answer

Chain of custody is a documented record ensuring that a specimen's integrity and possession are tracked continuously, required for forensic or legal specimens such as drug screens.

NAPTP - National Association of Phlebotomy Technician Professionals Practice Test

NAPTP - National Association of Phlebotomy Technician Professionals Practice Test

NAPTP Specimen Processing and Handling 3