split specimen

Medical term Special Collections

One urine void divided into two sealed bottles: the primary (Bottle A, at least 30 mL) for testing and the split (Bottle B, at least 15 mL) kept for retesting.

Sources

• 49 CFR 40.71 How does the collector prepare the urine specimen? (split specimen, tamper-evident bottle seals, donor initials) · U.S. Government Publishing Office (govinfo), Code of Federal Regulations, 2025 edition
• 49 CFR 40.3 What do the terms used in this part mean? (chain of custody, collector, primary and split specimen, specimen bottle) · U.S. Government Publishing Office (govinfo), Code of Federal Regulations, 2025 edition

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