Adulteration (Dilution), Urine

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Test Details

Synonyms

  • FAQS
  • Forensic Adulteration Quality System

Test Includes

Urine creatinine with reflex to specific gravity if <20 mg/dL; nitrite; pH

Use

Evaluation of specimen validity for drugs of abuse testing

Reference Interval

Detectability: normal: creatinine: ≥20 mg/dL; specific gravity: 1.003−1.030; nitrite: ≤200 μg/mL; pH: 4.5 to 8.9

Specimen Requirements

Specimen

Urine

Volume

20 mL

Container

Use plastic urine drug bottle and tamper-evident seal for forensic specimen. Collection kits are available by request from the laboratory.

Collection

Urine temperature monitoring is recommended for samples to be tested for medicolegal purposes.

Storage Instructions

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

Clinical Information

Special Instructions

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.

LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
788890 Adulteration (Dilution), Urine 788927 Creatinine, Urine mg/dL 2161-8
788890 Adulteration (Dilution), Urine 788972 Nitrite, Urine mcg/mL 5802-4
788890 Adulteration (Dilution), Urine 788919 pH, Urine 2756-5
Reflex Table for Creatinine, Urine
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 788905 Specific Gravity 788901 Specific Gravity 2965-2
Reflex Table for Creatinine, Urine
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 788901 Specific Gravity 788901 Specific Gravity 2965-2

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The LOINC® codes are copyright © 1994-2017, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. Permission is granted in perpetuity, without payment of license fees or royalties, to use, copy, or distribute the LOINC® codes for any commercial or non-commercial purpose, subject to the terms under the license agreement found at https://loinc.org/license/. Additional information regarding LOINC® codes can be found at LOINC.org, including the LOINC Manual, which can be downloaded at LOINC.org/downloads/files/LOINCManual.pdf