CLT Equipment Operation & Maintenance 2

Question 1

When performing a daily function check on an automated hematology analyzer, which control material should be run first?

Accepted Answer

Normal-level control

Answer

Normal-level (mid-range) controls are typically run first to verify the analyzer is operating within the expected reference range before running abnormal controls.

Question 2

A centrifuge makes an unusual grinding noise during operation. What is the FIRST action the technologist should take?

Accepted Answer

Stop the centrifuge and remove it from service for inspection

Answer

Unusual noises during centrifuge operation indicate a mechanical problem; the unit must be stopped and removed from service to prevent injury or damage.

Question 3

What is the purpose of a Westgard rule (1-3s) in laboratory quality control?

Accepted Answer

It rejects a run when one control result exceeds ±3 SD

Answer

The 1-3s Westgard rule is a rejection rule triggered when any single control value falls beyond ±3 standard deviations from the mean.

Question 4

Which maintenance task is MOST important to perform before storing a pH meter electrode overnight?

Accepted Answer

Rinsing the electrode with distilled water and storing in storage solution

Answer

pH electrodes must be kept hydrated; rinsing with distilled water then storing in appropriate storage solution prevents the sensing glass from drying and cracking.

Question 5

A pipette calibration check shows volumes consistently delivered are 2% below the nominal volume. This represents:

Accepted Answer

Systematic error requiring pipette recalibration or replacement

Answer

A consistent bias in one direction (always low) is a systematic error, indicating the pipette needs recalibration or servicing.

(CLT) Clinical Laboratory Technologist Certification Practice Test

(CLT) Clinical Laboratory Technologist Certification Practice Test

CLT Equipment Operation & Maintenance 2