Clinical Chemistry Flashcards
7 cards from real CMT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Clinical Chemistry flashcards as text
Two consecutive control results exceed +2 SD on the same side of the mean. This violates which Westgard rule, and what error does it indicate?
Answer: 2-2s; systematic error
2-2s rejects a run when two consecutive controls exceed 2 SD on the same side, which signals systematic bias.
According to Beer's law, absorbance is:
Answer: Directly proportional to concentration
A = abc, so absorbance increases linearly with concentration at a fixed path length.
The Jaffe method for creatinine uses which reagent?
Answer: Alkaline picrate
Creatinine reacts with picrate in alkaline solution to form a red-orange complex.
Increased conjugated bilirubin, positive urine bilirubin, and decreased urine urobilinogen most strongly suggest:
Answer: Biliary obstruction
Blockage stops bilirubin reaching the gut, so urobilinogen falls while water-soluble conjugated bilirubin spills into urine.
Which handling requirement is most critical for a serum bilirubin specimen?
Answer: Protect from light
Light breaks down bilirubin and causes falsely low results.
For a plasma ammonia level, the specimen should be:
Answer: Placed on ice and analyzed promptly
Red cell metabolism and deamination in vitro raise ammonia quickly, so chilling and fast testing are essential.
Urine creatinine 100 mg/dL, plasma creatinine 1.0 mg/dL, 24-hour urine volume 1440 mL. What is the creatinine clearance?
Answer: 100 mL/min
1440 mL/day is 1 mL/min, so clearance = (100 × 1)/1.0 = 100 mL/min.