CLT Clinical Laboratory Techniques & Procedures 2

Question 1

Which centrifuge speed is most appropriate for separating serum from a whole blood specimen?

Accepted Answer

2,000–3,000 rpm for 10 minutes

Answer

Routine serum separation requires centrifugation at approximately 2,000–3,000 rpm for 10 minutes to pellet cells without hemolysis.

Question 2

A laboratory technologist notices a clot in an EDTA tube collected for a CBC. What is the most appropriate action?

Accepted Answer

Recollect the specimen from the patient

Answer

Clotted EDTA specimens are unsuitable for CBC analysis and must be recollected because platelet counts and cell morphology will be inaccurate.

Question 3

The delta check system in laboratory information systems is primarily used to:

Accepted Answer

Compare a current result with a previous result from the same patient

Answer

Delta checks compare current patient results against prior results to detect specimen mix-ups, labeling errors, or unexpected clinical changes.

Question 4

When performing a manual differential on a peripheral blood smear, the technologist should count how many cells?

Accepted Answer

100 WBCs

Answer

The standard manual differential requires counting 100 WBCs in the monolayer area of the smear to classify cell types as percentages.

Question 5

Which specimen type is required for a plasma renin activity (PRA) test?

Accepted Answer

EDTA plasma (lavender-top tube)

Answer

PRA requires EDTA plasma collected on ice because EDTA chelates calcium to inhibit angiotensin-converting enzyme and the cold slows enzymatic degradation.

(CLT) Clinical Laboratory Technologist Certification Practice Test

(CLT) Clinical Laboratory Technologist Certification Practice Test

CLT Clinical Laboratory Techniques & Procedures 2