Medical Laboratory Technician Exam Laboratory Operations and Safety 2

Question 1

In a Levey-Jennings chart, which Westgard rule flags a run when one control value exceeds the mean by more than 3 standard deviations?

Accepted Answer

1-3s

Answer

1-2s

Answer

2-2s

Answer

R-4s

Question 2

Which type of error causes all quality control results to shift in the same direction over time?

Accepted Answer

Systematic error

Answer

Random error

Answer

Gross error

Answer

Blunder error

Question 3

A laboratory's proficiency testing (PT) result for glucose is graded as unacceptable. What is the required next step under CLIA?

Accepted Answer

Perform an investigation and implement corrective action

Answer

Repeat the PT sample on a different instrument

Answer

Report the result to CMS within 24 hours

Answer

Discontinue glucose testing until the next PT event

Question 4

Which type of pipette delivers its nominal volume from tip drainage and is identified by a frosted or etched band near the top?

Accepted Answer

TD (to deliver) pipette

Answer

TC (to contain) pipette

Answer

Mohr pipette

Answer

Pasteur pipette

Question 5

What is the purpose of a delta check in the laboratory?

Accepted Answer

To compare a patient's current result to a previous result

Answer

To verify instrument calibration

Answer

To evaluate interlab proficiency testing performance

Answer

To check reagent lot-to-lot consistency

Question 6

Which tube color is used for serum chemistry testing because it contains a clot activator and gel separator?

Accepted Answer

Gold/SST

Answer

Lavender/purple

Answer

Green

Answer

Light blue