Question 1
A control has mean 100 mg/dL and SD 2 mg/dL. A result is 104 mg/dL. How should it be interpreted?
Show answer & explanation
Correct answer: A - It is 2 standard deviations above the mean and should be evaluated according to QC rules
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These 10 free CC questions are organized by exam domain, so you can see how each part of the Clinical Chemist blueprint is tested. Reveal the answer and explanation under each question.
A control has mean 100 mg/dL and SD 2 mg/dL. A result is 104 mg/dL. How should it be interpreted?
Correct answer: A - It is 2 standard deviations above the mean and should be evaluated according to QC rules
A sandwich immunoassay gives a falsely low result in a patient with extremely high analyte concentration. What is the likely cause?
Correct answer: A - High-dose hook effect causing antigen excess
Which technique identifies compounds by mass-to-charge ratio?
Correct answer: A - Mass spectrometry
What does hemoglobin A1c primarily represent?
Correct answer: A - Average glycemic exposure over approximately the previous 2 to 3 months
A patient with vomiting has pH 7.52, PCO2 47 mmHg, and bicarbonate 37 mmol/L. Which disorder is most consistent?
Correct answer: A - Metabolic alkalosis with respiratory compensation
Why is timing important for therapeutic hormone measurement?
Correct answer: A - Timing can affect measured concentrations and clinical interpretation
Why is collection timing important in therapeutic drug monitoring?
Correct answer: A - Specimen timing relative to dosing affects interpretation
Urine dipstick is positive for blood but microscopy shows no red blood cells. What is most likely?
Correct answer: A - The specimen contains hemoglobin or myoglobin
Which biomarker is most useful for detecting acute myocardial injury when collected at the appropriate time?
Correct answer: A - Elevated cardiac troponin concentration with appropriate timing
A potassium result is markedly increased in a visibly hemolyzed specimen. What is the best interpretation?
Correct answer: A - The potassium result may be falsely increased because of specimen interference
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