Bilirubin, Amniotic Fluid Scan

CPT: 82143
Updated on 1/24/2018
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Test Details


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

Test Includes

Delta OD value at 450 nm


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


No correction for meconium contamination possible



Reference Interval

Varies with gestational age

Specimen Requirements


Amniotic fluid, protected from light


4 mL

Minimum Volume

3.5 mL


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.


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.


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

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