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Test Code FMBM Fetomaternal Bleed, Flow Cytometry, Blood

Additional Codes



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 Clinic Laboratories in Rochester

Specimen Type

Whole Blood EDTA

Ordering Guidance

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 collection.

Specimen Required

Container/Tube: Lavender top (EDTA)

Specimen Volume: Full tube

Collection Instructions:

1. Do not centrifuge.

2. Invert several times to mix blood.

3. Send specimen in original tube. Do not aliquot.

Specimen Minimum Volume

1 mL

Specimen Stability Information

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

Reference Values

≤1.5 mL of fetal RBCs in normal adults

Day(s) Performed

Monday through Sunday

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

Report Available

Same day/1 day

Reject Due To

Gross hemolysis Reject
Gross lipemia Reject
Gross icterus Reject
Clotted blood Reject

Method Name

Flow Cytometry