MLT 230 : Clinical Chemistry, Unit 1 Questions With Complete Solutions

101) Random error would be caused by: a. contaminated reagents. b. pipetting errors. c. inappropriate preparation of calibrators. d. low volume reagent blanks. correct answer: B 102) According to CLIA regulations, a score of _____ must be attained on three consecutive external proficiency test challenges for a laboratory to be accredited and continue patient testing. a. 50% b. 60% c. 70% d. 80% correct answer: D 103) You have received your proficiency test results from the accrediting agency and note that your creatinine result was unacceptable at greater than 2 SDI from the group mean. The value that was entered on your survey report form was 15 mg/dL. The group method mean was 1.3 mg/dL, with a method standard deviation of 0.3 mg/dL. You realize that your laboratory made an error in entering the result. The result was actually 1.5 mg/dL, using this corrected result what would the correct SDI be? a. 45.6 SDI b. 4.56 SDI c. 1.08 SDI d. 0.67 SDI correct answer: Answer: (1.5-1.3)/0.3=0.67 D 104) You have received your proficiency test results from the accrediting agency and note that your creatinine result was unacceptable at greater than 2 SDI from the group mean. The value that was entered on your survey report form was 15 mg/dL. The group method mean was 1.3 mg/dL with a method standard deviation of 0.3 mg/dL. You realize that your laboratory made an error in entering the result. The result was actually 1.5 mg/dL, would the recalculated SDI now be in agreement with the rest of the laboratories in the testing program? a. Yes