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HelpTest ID FMB Fetomaternal Bleed, Flow Cytometry, Blood
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 EDTAOrdering Guidance
This test is for the detection of fetal bleed, it should not be used to detect the hereditary persistence of fetal hemoglobin (HPFH) or to detect fetal maternal hemorrhage in a mother with HPFH. For HPFH diagnosis, order HBEL1 / Hemoglobin Electrophoresis Evaluation, Blood.
NY State Clients: Testing is available; order FMBNY / Fetomaternal Bleed, New York, Blood.
Shipping Instructions
Specimen must arrive within 5 days (preferably 24-72 hours) of collection.
Specimen Required
Container/Tube: Lavender top (EDTA)
Specimen Volume: 6 mL
Collection Instructions:
1. Fill evacuated tube as completely as possible.
2. Do not centrifuge.
3. Invert several times to mix blood.
4. Send whole blood specimen in original tube. Do not aliquot as aliquoting into or out of a sample tube can adversely affect test results.
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Whole Blood EDTA | Refrigerated (preferred) | 5 days | |
| Ambient | 5 days |
Reference Values
≤3.75 mL of fetal red blood cells in normal adults
Day(s) Performed
Monday through Sunday
CPT Code Information
88184-Flow cytometry, cell surface, cytoplasmic
Report Available
Same day/1 dayReject Due To
| Gross hemolysis | Reject |
| Gross lipemia | Reject |
| Gross icterus | Reject |
| Clotted blood | Reject |