- Transaction Code: 3145-00
- CPT Code (Suggested): 85461
Rh (D) positive fetal red blood cells are detected in the presence of Rh (D) negative maternal red blood cells using a rosette method. This method is used for screening Rh negative mothers who deliver an Rh positive infant or fetus beyond 20 weeks gestation or post-trauma to determine fetomaternal hemorrhage in excess of 30 ml of blood or 15 ml of red blood cells. If the fetal bleed screen is positive, a quantitative Kleihauer-Betke test will be performed.
- Sample Required: 7 ml EDTA
(If postnatal sample, draw >1 hour after delivery)
- Normal Test Values: Negative (if positive, a quantitative Kleihauer-Betke test will be performed)
- Analytic Time: 24 hours if weekday; 48 hours if weekend
- Days Test is Set Up: Monday through Sunday
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