Clinical Chemistry Compre Questions With Complete Solutions.

Which of the following is the percent concentration of a solution (w/v) containing 300g of MgCl2 dissolved in 2.5L of distilled water? a. 12% b. 13% c. 24% d. 25% correct answer: a. 12% Which of the following is the molarity of a solution containing 400g of HCl dissolved in 1.5 liters of distilled water? (gms of HCl = 36) a. 6.4M b. 6.3M c. 7.4M d. 7.8M correct answer: c. 7.4M A 24-hour urine sample submitted to the laboratory for creatinine determination has a total volume of 1500mL. A 1:200 dilution of the specimen was prepared by which of the following procedure? a. 0.1mL of urine added to 20mL of distilled water b. 0.1mL of urine added to 1.9mL of distilled water c. 0.2mL of urine added to 2.0mL of distilled water d. 0.2mL of urine added to 1.8mL of distilled water e. No answer correct answer: E. No answer Using the same date of item #3, the creatinine level of the diluted urine specimen obtained was 0.8mg/dL. Which of the following corresponds to the urine creatinine concentration of the original sample? a. 180mg/dL b. 150mg/dL c. 160mg/dL (0.8*200) d. 100mg/dL correct answer: c. 160mg/dL (0.8*200) Which of the following is the normality of 100g H2SO4 dissolved in 500mL of distilled water? (gmw HCl=36) a. 12.5N b. 11.1N c. 9.5N d. 8.6N e. No answer correct answer: E. No answer The following items are included under pre-analytical phase of laboratory procedure? a. Quality control program, machine calibration b. Encoding of results, releasing of result form c. Correct patient ID, checking of request forms, specimen preparation d. AOTA correct answer: c. Correct patient ID, checking of request forms, specimen preparation Which of the following analytes should not be measured on hemolysed specimen? a. BUN b. K