Levey-Jennings Chart Analysis: Cholesterol QC Exercise Insights

Levey-Jennings QC Practice Exercise: Cholesterol example where: Control 1 has a mean of 200 mg/dL and a standard deviation of 4.0 mg/dL. Control 2 has a mean of 250 mg/dL and a standard deviation of 5.0 mg/dL. Prepare appropriate control charts and interpret the results. Da y Control 1 Value Control 2 Value 1 2s Rule Violation 1 3s Rule Violation Accept(A), Warning (W), or Reject(R)? Comments 1 200 247 a 2 205 250 a 3 195 255 a 4 202 243 a 5 186 254 -2s -3s r 6 207 263 +2s W(a) 7 194 251 a 8 209 264 +2s r Both exceeded +2s 9 200 253 a 10 196 244 a 11 190 261 +2s and -2s r Both exceeded 2s in opposite direction 12 204 254 a 13 196 239 -2s W(a) 14 207 236 -2s r Exceeding -2s 15 200 250 a 16 205 259 a 17 209 257 +2s W(a) 18 197 256 a 19 196 249 a 20 198 257 a 21 197 241 a 22 195 255 a 23 198 250 a 24 199 259 a 25 191 247 -2s W(a) Negative shift 26 197 242 a 27 190 256 -2s W(a) See if negative shift continues 28 202 246 a

Case study 3.1 Macy works within the Chemistry department in her first job outside of a Medical Laboratory Science program. Today has been a typically busy day for her as she loads samples into instruments and checks results. Macy loaded two levels of quality control (QC) materials prior to a large run of patients, and on checking the results for the QC, she noticed that one of the levels was outside the range that had been established. 1. What is Macy’s next step? a. Testing should be suspended until the issue is resolved. b. It depends on how far “out” the QC level is. c. There are a number of stat tests in the run, and she should report them “out.” d. She should repeat running the QC level that is out until it falls within the range. As part of Macy’s investigation into the QC issue, she noticed that the scheduled preventive maintenance (PM) activity was not performed yesterday. Macy completes the PM and then recalibrates the test that is having QC issues. After recalibration, the QC level is now in range. Macy documents the missed PM and her resolution within the binder kept with that machine. 2. Are Macy’s actions considered part of a quantitative QC program? a. No, a quantitative QC program involves using only two levels of control material for each day of testing. b . Yes, a quantitative QC program encompasses both equipment and reagents. c. No: the most important aspect of a quantitative QC program is the assurance of reliability. d. Yes, calibration is the most important part of a quantitative QC program. Critical Thinking Group Discussion Questions 1. What is the difference between a 12s and a 13s? 2. What is the significance of a 12s versus a 13s value?

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Lab Assignment # 5 Levey-Jennings Chart CLS 252

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