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Test Code FMB Fetomaternal Bleed, Flow Cytometry, Blood

Additional Codes


Powerchart: Fetal Maternal Hemorrhage Quantitative

Epic: Fetomaternal Bleed Flow Cytometry [LAB3505]

Reporting Name

Fetomaternal Bleed,Flow Cytometry,B

Useful For

Determining the volume of fetal-to-maternal hemorrhage for the purposes of recommending an increased dose of the Rh immune globulin

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type

Whole Blood EDTA

Advisory Information

This test is for the detection of fetal bleed, it should not be used to detect the hereditary persistence of fetal hemoglobin (see HPFH / Hemoglobin F, Red Cell Distribution, Blood) or to detect fetal maternal hemorrhage in a mother with hereditary persistence of fetal hemoglobin.

Shipping Instructions

Specimen must arrive within 120 hours (preferably 24-72 hours) of draw.

Specimen Required

Container/Tube: Lavender top (EDTA)

Specimen Volume: Full tube

Collection Instructions:

1. Do not centrifuge or aliquot.

2. Invert several times to mix blood.

3. Send specimen in original tube.

Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time
Whole Blood EDTA Refrigerated (preferred) 5 days
  Ambient  5 days

Reference Values

≤1.5 mL of fetal RBCs in normal adults

Day(s) and Time(s) Performed

Monday through Sunday; Varies

Test Classification

This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information

88184-Flow cytometry, cell surface, cytoplasmic

LOINC Code Information

Test ID Test Order Name Order LOINC Value
FMB Fetomaternal Bleed,Flow Cytometry,B In Process


Result ID Test Result Name Result LOINC Value
28204 Mother's Rh 10331-7
28202 Fetal-Maternal Bleed 55730-6
28203 Rh Immune Globulin 55731-4
4058 Remarks 48767-8

Reject Due To


Mild reject; Gross reject


Mild reject; Gross reject


Mild reject; Gross reject


Clotted blood

Method Name

Flow Cytometry