Bilirubin, Amniotic Fluid Scan

CPT: 82143
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Test Details

Synonyms

  • Amniotic Fluid Bilirubin
  • Delta OD, Amniotic Scan
  • Liley Scan

Test Includes

Delta OD value at 450 nm

Use

Evaluate cases of suspected maternal-fetal blood incompatibility, hemolytic disease of the newborn

Limitations

No correction for meconium contamination possible

Methodology

Spectrophotometry

Reference Interval

Varies with gestational age

Specimen Requirements

Specimen

Amniotic fluid, protected from light

Volume

4 mL

Minimum Volume

3.5 mL

Container

Amber plastic transport tube with amber stopper. (If amber tubes are unavailable, cover standard transport tube completely, top and bottom, with aluminum foil. Identify specimen with patient name directly on the container and on the outside of the aluminum foil. Secure with tape.) For amber plastic transport tube and amber stopper, order LabCorp N° 23598.

Collection

Protect specimen from light. Amniocentesis is performed by physician. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.

Storage Instructions

Protect specimen from exposure to light since bilirubin is unstable in light. Although sterile specimens kept in the dark are reported to be stable for nine months refrigerated and at least 30 days at room temperature, it is probably wiser to keep the sample frozen until it can be analyzed since it cannot be easily replaced if instability is suspected to have affected the result.

Causes for Rejection

Excessive exposure to light; grossly bloody specimen; specimen contaminated with meconium (A single passage into the amniotic fluid will require about three weeks to clear.)

Clinical Information

Special Instructions

The test request form must include weeks of gestation.

LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
002196 Bilirubin, Amniotic Fluid Scan 12476-8 002196 Bilirubin, Amniotic Fluid Scan delta OD 12476-8
Reflex Table for Bilirubin, Amniotic Fluid Scan
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 123102 Disclaimer: 123102 Disclaimer: N/A

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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