Medical Laboratory Technician Exam Laboratory Operations and Safety 3

Question 1

Which centrifuge speed range is typically used to separate plasma or serum from cellular elements in routine blood specimens?

Accepted Answer

1,000–2,000 × g

Answer

100–200 × g

Answer

10,000–15,000 × g

Answer

50,000–100,000 × g

Question 2

A laboratory technician spills a concentrated acid on the bench. What is the correct immediate first action?

Accepted Answer

Flush the area with large amounts of water

Answer

Neutralize with sodium bicarbonate powder

Answer

Wipe up with paper towels

Answer

Notify the supervisor before doing anything

Question 3

Which of the following is the correct order of draw when collecting multiple tubes via venipuncture, according to CLSI guidelines?

Accepted Answer

Blood culture → Citrate (blue) → SST (gold) → Heparin (green) → EDTA (lavender)

Answer

EDTA (lavender) → SST (gold) → Heparin (green) → Citrate (blue) → Blood culture

Answer

SST (gold) → Blood culture → Citrate (blue) → EDTA (lavender) → Heparin (green)

Answer

Heparin (green) → Citrate (blue) → Blood culture → EDTA (lavender) → SST (gold)

Question 4

What is the purpose of a reagent blank in spectrophotometry?

Accepted Answer

To set absorbance to zero using all reagents minus the analyte

Answer

To calibrate the wavelength selector

Answer

To check detector linearity

Answer

To verify the lamp intensity

Question 5

When performing a urinalysis, a specimen that has been stored at room temperature for more than 2 hours is considered unsuitable primarily because:

Accepted Answer

Bacteria multiply and may cause false-positive nitrite results

Answer

Glucose concentration increases with time

Answer

Red blood cells become more resistant to lysis

Answer

Protein levels falsely decrease due to precipitation

Question 6

Which laboratory accreditation organization is deemed by CMS as an alternative to direct CMS inspection under CLIA?

Accepted Answer

CAP (College of American Pathologists)

Answer

AABB

Answer

ASCP

Answer

NAACLS