US FDA
21 CFR 211.160(b) - Laboratory Controls - Scientifically Sound Specifications and Methods
Plain-language explanation, inspection context and common violation patterns.
What it says
Laboratory controls must include scientifically sound and appropriate specifications, standards, sampling plans and test procedures designed to assure that components, drug products and in-process materials conform to appropriate standards of identity, strength, quality and purity.
Paraphrased for plain-language clarity. Always verify against the current published regulation text.
What it means in practice
- A specification or test method is not automatically compliant simply because it exists and has been followed consistently - it must also be scientifically justified for its intended purpose.
- This provision covers the full laboratory control system: specifications, sampling plans, and test procedures together, not any one element in isolation.
- An analytical method that has not been properly validated for its intended use, or a specification set without documented scientific rationale, falls under this citation even if no specific test result has ever failed.
What FDA inspectors look for
- Whether analytical methods have documented validation data supporting their use for the specific application, consistent with ICH Q2(R2) parameters.
- Whether sampling plans are statistically and scientifically defensible for the batch size and risk involved, rather than an arbitrary fixed number of samples.
- Whether specifications trace back to a documented scientific or regulatory basis, rather than being copied from a similar product without justification.
Most common violation
Analytical methods used for release or stability testing without complete validation data supporting their accuracy, precision and specificity for the intended use, or specifications adopted without documented scientific justification. 21 CFR 211.160(b) has ranked among the top four FDA drug 483 citation categories in recent inspection years.
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