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Fetal Bleed Screen

Item Value
Approval req'd? No
Available Stat? No
Test code FBLD
Performed by Blood Bank
Container type Lavender top (6 mL size preferred)
Amount to Collect 6 mL blood
Sample type EDTA whole blood
Preferred volume 6 mL blood
Min. Volume 3 mL blood
UCSF Rejection Criteria Unsigned, mislabeled or unlabeled sample
Normal range Negative
Synonyms Rosettings test; Rh positive fetal red cells; Rh positive fetal RBC's
Reflex? If positive, the sample is referred to hematology for Kleihauer-Betke testing to determine the extent of the bleed and to calculate the Rhogam dosage. The Kleihauer-Betke test is billed separately.
Additional information A qualitative screening test for Rh positive fetal red blood cells in an Rh negative mother's circulation. This test is performed automatically by the Blood Bank when Rh Immune Globulin (Rhogam) is ordered.

This test is primarily used to determine the need for additional Rhogan doses and if positive the "Fetal cells, Quantitative" (Kleihauer-Betke) test should be performed in order to calculate the additional Rhogam needed.

This test cannot be used to determine the extent of a fetal-maternal hemorrhage in an Rh positive woman. In that setting the Fetal Cells, Quantitative test should be ordered.
LOINC code 33900-2
Last Updated 11/18/2013 2:37:17 PM
Entry Number 378
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