What is westgard rule and please explain rejection and warning rule .

Question

Accepted Answer

Warning rule ONE 2SD
REJECTION RULE 2-2S
"       "        "               1-3S
"       "       "                  R4s
"       "         "                41s
"         "       "                  10×
"           "       "                    8×

Accepted Answer

The Westgard Rules are a set of statistical quality control rules used in clinical laboratories to monitor the accuracy and precision of analytical testing systems. These rules help detect errors in the testing process and ensure reliable patient results.

Overview of Westgard Rules

Developed by James O. Westgard, these rules are applied to control charts that display the results of quality control (QC) samples.

They help identify random and systematic errors that may affect test results.

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Key Westgard Rules

1. 1:2s Rule (Warning Rule)

If a single QC result exceeds ±2 standard deviations (SD) from the mean, it serves as a warning.

Action: Recheck the process but do not reject the run immediately. This rule often triggers further evaluation.

2. 1:3s Rule (Rejection Rule)

If a single QC result exceeds ±3 SD, the run is rejected.

Action: Indicates significant error, requiring investigation and corrective action.

3. **2:2s Rule (Re

What is westgard rule and please explain rejection and warning rule .

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