MLPAO Laboratory Equipment and Quality Questions and Answers 2

Question 1

What is the function of a micropipette calibration check using gravimetric analysis?

Accepted Answer

To verify the pipette delivers the correct volume by weighing dispensed water

Answer

To check the pipette tip for contamination

Answer

To measure the viscosity of reagents

Answer

To verify the electrical calibration of the analyzer

Question 2

What is the purpose of the discriminator setting on a hematology analyzer for cell counting?

Accepted Answer

To define voltage thresholds that distinguish cell populations by size or electrical impedance

Answer

To set the temperature for cell lysis

Answer

To calibrate the detector for specific cell types

Answer

To set the maximum cell count per analysis

Question 3

Which of the following calibration materials is appropriate for calibrating a clinical chemistry analyzer?

Accepted Answer

Commercially prepared calibrators with established analyte concentrations traceable to reference methods

Answer

Patient samples with previously known results

Answer

Quality control materials at normal concentration

Answer

Distilled water as a universal calibrator

Question 4

What is the purpose of preventive maintenance on laboratory analyzers?

Accepted Answer

To ensure consistent analyzer performance, extend instrument life, and prevent unexpected failures

Answer

To eliminate the need for quality control testing

Answer

To recalibrate the analyzer after every patient run

Answer

To replace all consumable parts monthly regardless of need

Question 5

An autoclave is used for sterilization in medical laboratories. What is the minimum recommended temperature, pressure, and time for a standard gravity cycle sterilization?

Accepted Answer

121°C, 15 psi, 15-20 minutes

Answer

100°C, 0 psi, 10 minutes

Answer

134°C, 30 psi, 3 minutes

Answer

115°C, 10 psi, 30 minutes

Question 6

In flow cytometry, what does the parameter 'FSC' (forward scatter) primarily indicate about a cell?

Accepted Answer

Cell size (volume)

Answer

Cell granularity or internal complexity

Answer

Surface antigen expression level

Answer

Cell viability (live/dead)