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Adulteration (Dilution), Urine
- Forensic Adulteration Quality System
Urine creatinine with reflex to specific gravity if <20 mg/dL; nitrite; pH
Evaluation of specimen validity for drugs of abuse testing
Detectability: normal: creatinine: ≥20 mg/dL; specific gravity: 1.003−1.030; nitrite: ≤200 μg/mL; pH: 4.5 to 8.9
Urine temperature monitoring is recommended for samples to be tested for medicolegal purposes.
Maintain specimen at room temperature. If arrival extends beyond seven days, then refrigerate.
Causes for Rejection
Quantity not sufficient for analysis; improper specimen (serum, plasma, blood); incomplete chain-of-custody documentation; incomplete specimen identification; improper or missing tamper-evident seals
Chain-of-custody documentation is required for samples submitted for preëmployment, random employee testing, and forensic purposes. For other applications, use the standard request form. Please mark chain-of-custody test number on the request form.