CLT Equipment Operation & Maintenance 3

Question 1

An autoclave used for sterilization of laboratory materials fails its biological indicator (Geobacillus stearothermophilus spore strip) test. What is the correct response?

Accepted Answer

Remove the autoclave from service, notify supervisor, and investigate the failure

Answer

A failed biological indicator means sterilization was not achieved; the autoclave must be taken out of service and the failure investigated before further use.

Question 2

When calibrating a laboratory balance, certified calibration weights must be:

Accepted Answer

Handled with forceps or gloves to prevent oils from altering their mass

Answer

Skin oils and moisture from bare hands can alter the mass of precision calibration weights, so forceps or clean gloves must always be used when handling them.

Question 3

A co-oximeter in the blood gas laboratory requires a reference solution check. The purpose of this check is to:

Accepted Answer

Verify the wavelength accuracy for multi-wavelength hemoglobin measurements

Answer

Co-oximeters use multiple wavelengths to distinguish oxyhemoglobin, deoxyhemoglobin, carboxyhemoglobin, and methemoglobin; reference solution checks verify wavelength calibration.

Question 4

Which action is required when a refrigerator used to store reagents reads 10°C on the temperature log, exceeding the 2–8°C required range?

Accepted Answer

Quarantine all temperature-sensitive reagents, document, and notify the supervisor

Answer

Reagents stored outside their required temperature range may be compromised; they must be quarantined and the excursion documented and reported per laboratory policy.

Question 5

What does a Levy-Jennings chart primarily display?

Accepted Answer

Control values plotted sequentially to visualize trends and shifts

Answer

A Levy-Jennings chart plots sequential control values against time, with ±1, ±2, and ±3 SD lines, allowing visualization of trends, shifts, and random error.

(CLT) Clinical Laboratory Technologist Certification Practice Test

(CLT) Clinical Laboratory Technologist Certification Practice Test

CLT Equipment Operation & Maintenance 3