CLT Laboratory Equipment Operation & Maintenance 3

Question 1

The linearity verification for a glucose analyzer should be performed using:

Accepted Answer

Commercial linearity materials spanning the reportable range

Answer

Commercial linearity materials with certified target values spanning the analytical measurement range (AMR) are used to verify that the analyzer produces results proportional to analyte concentration across its full range.

Question 2

A pH meter requires calibration with buffers at two points before use. This is done to:

Accepted Answer

Correct for both the offset and slope of the electrode response

Answer

Two-point calibration corrects the offset (zero intercept) and the slope of the glass electrode's response curve, ensuring accurate pH readings across the measurement range.

Question 3

When a laboratory pipette fails its gravimetric verification, the technologist should:

Accepted Answer

Tag it out of service and send it for repair or recalibration

Answer

A pipette that fails gravimetric verification must be taken out of service immediately and sent for professional recalibration or repair to prevent analytical errors.

Question 4

The function of the sheath fluid in a flow cytometer is to:

Accepted Answer

Hydrodynamically focus cells into a single-file stream

Answer

Sheath fluid surrounds the sample stream in a flow cytometer, using hydrodynamic focusing to align cells single-file through the laser interrogation point for accurate individual cell analysis.

Question 5

An ion-selective electrode (ISE) analyzer for sodium shows a carryover effect between high and low samples. The MOST likely cause is:

Accepted Answer

Insufficient washout volume between samples

Answer

Carryover in ISE analyzers is most commonly caused by insufficient wash volume between samples, causing residual analyte from a high sample to contaminate the next low sample.

(CLT) Clinical Laboratory Technologist Certification Practice Test

(CLT) Clinical Laboratory Technologist Certification Practice Test

CLT Laboratory Equipment Operation & Maintenance 3