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HelpTest Code LAB0214439 Fetal Maternal Hemmorhage, Blood
Methodology
Known Rh-positive cells form rosettes around Rh-positive fetal cells in specimen from mother. This test screens for fetomaternal hemorrhage in Rh-negative mothers delivering Rh-positive child/fetus.
Performing Laboratory
CentraCare Laboratory Services
Specimen Requirements
Specimen must be drawn post delivery or post immunizing event in an Rh negative patient >20 weeks gestation.
Tested within 2 days of immunizing event
Specimen Type: Whole blood
Container/Tube: Lavender top (EDTA)
Specimen Volume: 5 mL
Specimen Transport Temperature
Ambient or refrigerated
Reference Values
Negative indicates fetomaternal hemorrhage of <15 mL
Critical Value: (Automatic call-back)
Positive Result.
If positive, Kleihauer-Betke Smear for Quantification of Fetal-Maternal Hemorrhage, Blood, test code LAB0220772, will be performed at an additional charge.
Day(s) Test Set Up
Monday through Sunday
Test Classification and CPT Coding
85461
85460 - Kleihauer-Betke Smear for Quantitation of Fetal-Maternal Hemorrhage, Blood (if appropriate)