MLS Exam 2 Questions & Answers 2024/2025

MLS Exam 2 Questions & Answers 2024/2025 Analytical Phase - ANSWERS-testing of the sample -least amount of error Calibration - ANSWERS-compares an instrument measure/reading to a known concentration (standard) -ran prior to quality control to assign a known value to an instrument output CV - ANSWERS-coefficient of variation -calculate the SD as a "percent of the mean" -used to compare SDs of two samples and to compare the precision differences between assays and methods Delta Check - ANSWERS-difference between a patient's current laboratory result and consecutive previous results that exceeds a specified cutoff value -can be due to insufficient quantity of blood in a sample tube, specimen contaminated with IV fluid, incorrect blood collection tube (anticoagulant) used for the assay Dispersion - ANSWERS-when random error or lack of precision increases -caused by instability problems with instrumentation Expiration Date - ANSWERS-changes once the bottle is opened External QC - ANSWERS-evaluates the accuracy of assay measurements ex) proficiency testing False Negative - ANSWERS-negative test result but does have the disease False Positive - ANSWERS-positive test result but does not have the disease Internal QC - ANSWERS-evaluates the daily precision of an assay