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UAMS Chem Intern Exam 1 Questions & Answers 2024/2025
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UAMS Chem Intern Exam 1 Questions & Answers 2024/2025 accuracy - ANSWERSagreement of results with the true value precision - ANSWERSreproductibility mean - ANSWERSthe average value in a set mode - ANSWERSmost common value in a set 2SD - ANSWERS95% confidence limits CV - ANSWERSS...

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  • August 28, 2024
  • 15
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • uams chem intern exam 1 questions answers 20242

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UAMS Chem Intern Exam 1 Questions &
Answers 2024/2025

accuracy - ANSWERSagreement of results with the true value



precision - ANSWERSreproductibility



mean - ANSWERSthe average value in a set



mode - ANSWERSmost common value in a set



2SD - ANSWERS95% confidence limits



CV - ANSWERSSDx100/mean



standard - ANSWERSsubstance whose exact concentrations are known



control - ANSWERSsubstance having a known "range" of values



What is a delta check and the reason for doing one? - ANSWERScomparison of a patients results with
their previous test results; help detect sample labeling errors, testing errors, and erroneous patient
results



What is a systematic error?

Give two examples. - ANSWERSerrors in the system that affect all samples in the run; incorrect
calibration, bad reagents, malfunctioning dilutors or pipettes



What is a random error?

, How often can random errors occur?

Give two examples. - ANSWERSmistakes that occur without prediction or regularity but do not affect all
samples on a run; occur as frequently as 1:20 results; temp fluctuations, mislabeled specimen, clerical
errors, carelessness



What is a "trend"?

Give two common causes. - ANSWERSgradual upward or downward movement of control values in 6 or
more consecutive runs; deterioration of reagents, standards, or instrument performance



What is a "shift"?

Give two common causes. - ANSWERSwhen control results fall on either side of the mean on 6 or more
consecutive control runs; intro of something new to the procedures such as a new lot of reagents or a
sudden malfunction of the instrument



What is the purpose of the Westgard Rules? - ANSWERSa combination of decision criteria, or control
rules, to decide whether an analytical run is in-control or out-of-control



What does each of the Westgard Rules mean and can patient results be reported?

1. 1-2S

2. 1-3S

3. 2-2S - ANSWERS1. one control is >2SD; warning rule. accept the run

2. one control is >3SD; due to random or systematic error. reject the run

3. 2 or more controls are >2SD on the same day of testing or one control is >2SD on two consecutive
runs. suggests systematic error. reject the run



What does MSDS stand for and why is it important to have one? - ANSWERSMaterial Safety Data Sheet;
includes emergency contact info, precautions and treatment following esposure



routine chem tests MOST affected by hemolysis - ANSWERSK, Iron, LD, CK, ALP, AST, PO4



routine chem tests most affected by contamination with IV solution - ANSWERSK, glucose, Na, Cl

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