Never Leave Unused QC Reagents Unsegregated in GMP Laboratories

Don’t Leave Unused QC Reagents Unsegregated in GMP Laboratories

Remember: Always segregate unused quality control reagents — improper storage can cause testing mix-ups, data errors, and compliance issues.

Why This Matters in GMP

QC reagents are essential to analytical testing, but if left unsegregated or improperly labeled, they pose serious risks. Reagents may be confused with working ones, used beyond their stability window, or exposed to conditions that degrade their potency or specificity. The consequences include invalid results, batch failures, and regulatory non-conformance.

For instance, if a buffer solution prepared for a pH test is placed back near freshly prepared volumetric solutions without proper labeling or segregation, there is a high risk of inadvertent use. Such an error might alter test results or lead to batch release based on inaccurate data.

Also Read: Revalidate Cleaning SOPs Annually to Ensure GMP Compliance and Effectiveness

Regulatory and Compliance Implications

21 CFR Part 211.160 mandates laboratory controls to ensure test accuracy, including reagent labeling and use. EU GMP Chapter 6 stresses clear identification and segregation of test solutions and reagents. WHO GMP calls for proper management and documentation of laboratory chemicals and reagents, including their use and storage.

Auditors evaluate reagent labels, storage arrangements, reagent usage logs, and expired reagent disposal practices.

The absence of clear segregation between in-use and unused or expired reagents often leads to critical findings around data integrity and laboratory reliability.

Implementation Best Practices

Label all reagents with preparation date, expiry/retest date, preparer name, and batch reference. Store unused reagents in a separate, designated cabinet or cold storage area. Use color-coded labels or storage trays to distinguish them from active ones.

Also Read: Never Allow Untrained Staff to Perform Line Clearance Activities

Establish SOPs for reagent lifecycle management — from preparation to disposal. Train laboratory staff to review labels before use and log reagent consumption. Include reagent segregation checks in routine lab audits and inspections.

Regulatory References

– 21 CFR Part 211.160 – Laboratory controls and reagent labeling
– EU GMP Chapter 6 – QC laboratory practices and material handling
– WHO TRS 957, Annex 4 – Laboratory reagent management
– USP – Analytical instrument qualification (includes reagent handling)