CMLA Equipment Maintenance 5

Question 1

Which standard is most commonly referenced for biological safety cabinet certification and testing in the United States?

Accepted Answer

NSF/ANSI 49

Answer

NSF/ANSI 49 is the U.S. standard governing the design, construction, and field testing of Class II biosafety cabinets.

Question 2

What does a 'delta check' failure on a patient result indicate in the context of analyzer maintenance?

Accepted Answer

The current result differs significantly from the patient's previous result, suggesting a possible specimen or instrument error

Answer

Delta checks compare sequential patient results to flag unlikely changes that may indicate a mislabeled specimen, wrong patient, or instrument malfunction.

Question 3

A laboratory balance fails its linearity check with a certified weight set. What is the appropriate next step?

Accepted Answer

Remove the balance from service, recalibrate or send for repair, and recheck with certified weights before returning to use

Answer

A failed linearity check means the balance cannot be trusted for accurate measurement and must be removed from service until verified.

Question 4

What is the purpose of running a 'carry-over' test on an automated chemistry analyzer?

Accepted Answer

To detect contamination of a low-concentration sample by a preceding high-concentration sample in the same analyte

Answer

Carry-over tests use alternating high and low samples to quantify how much residual analyte from a high sample contaminates the next low sample.

Question 5

Which document specifies the manufacturer's recommended maintenance schedule for a laboratory instrument?

Accepted Answer

The instrument's operator or service manual

Answer

The operator or service manual provided by the manufacturer contains the recommended PM schedule, cleaning procedures, and part replacement intervals.

(CMLA) Certified Medical Laboratory Assistant Practice Test

(CMLA) Certified Medical Laboratory Assistant Practice Test

CMLA Equipment Maintenance 5