CLT Clinical Chemistry & Biochemical Analysis 3

Question 1

Which reagent strip test on a urinalysis detects the presence of bilirubin in urine?

Accepted Answer

Diazonium salt reaction

Answer

Tetramethylbenzidine reaction

Answer

Glucose oxidase reaction

Answer

Nitroprusside reaction

Question 2

The reference interval for serum potassium in adults is approximately:

Accepted Answer

3.5–5.0 mEq/L

Answer

1.5–2.5 mEq/L

Answer

5.5–7.0 mEq/L

Answer

7.0–9.0 mEq/L

Question 3

Serum iron studies show low serum iron, low transferrin saturation, and elevated TIBC. Which condition does this pattern suggest?

Accepted Answer

Iron deficiency anemia

Answer

Iron overload (hemochromatosis)

Answer

Anemia of chronic disease

Answer

Hemolytic anemia

Question 4

Which of the following proteins is measured to assess nutritional status and has a shorter half-life (~2 days), making it a sensitive indicator of acute changes?

Accepted Answer

Prealbumin (transthyretin)

Answer

Albumin

Answer

Transferrin

Answer

C-reactive protein

Question 5

A serum creatinine of 3.2 mg/dL in an adult patient is most consistent with which condition?

Accepted Answer

Significant renal impairment

Answer

Normal renal function

Answer

Mild dehydration

Answer

Liver cirrhosis

Question 6

Which principle underlies the ion-selective electrode (ISE) method used to measure electrolytes such as sodium and potassium?

Accepted Answer

Selective permeability of a membrane generating a potential difference

Answer

Enzymatic oxidation producing a measurable color change

Answer

Antigen-antibody complex formation altering light scattering

Answer

Radioactive decay proportional to ion concentration

Question 7

Which quality control rule, part of the Westgard rules, is violated when two consecutive control values fall more than 2 standard deviations from the mean on the same side?

Accepted Answer

2₂s rejection rule

Answer

1₂s warning rule

Answer

R₄s rejection rule

Answer

10x rejection rule