CLT Clinical Laboratory Techniques & Procedures 3

Question 1

Which quality control rule indicates a systematic error when two consecutive QC results fall more than 2 standard deviations in the same direction?

Accepted Answer

2-2s rule

Answer

The 2-2s Westgard rule is triggered when two consecutive QC values exceed 2 SD on the same side of the mean, indicating systematic bias.

Question 2

A urine specific gravity of 1.035 measured by refractometry would be best described as:

Accepted Answer

Hypersthenuric

Answer

Hypersthenuria refers to urine with a specific gravity above 1.030, indicating highly concentrated urine, which can occur in dehydration or ADH excess.

Question 3

When calibrating a micropipette for accuracy verification, the preferred method is:

Accepted Answer

Gravimetric measurement of dispensed distilled water

Answer

Gravimetric verification weighs the dispensed water on an analytical balance; using the density of water at a known temperature converts mass to volume.

Question 4

Which of the following is the primary reason for using a silica gel desiccant in reagent strip storage containers?

Accepted Answer

To maintain strip performance by absorbing moisture

Answer

Moisture degrades the chemical reagent pads on urinalysis strips; the desiccant absorbs ambient humidity to extend shelf life and preserve reactivity.

Question 5

A technologist is performing an acid-fast stain (Ziehl-Neelsen). What is the role of the carbol fuchsin heating step?

Accepted Answer

It drives the dye into the waxy mycobacterial cell wall

Answer

Heat facilitates penetration of carbol fuchsin through the high-lipid mycobacterial cell wall; the dye is then retained after acid-alcohol decolorization.

(CLT) Clinical Laboratory Technologist Certification Practice Test

(CLT) Clinical Laboratory Technologist Certification Practice Test

CLT Clinical Laboratory Techniques & Procedures 3