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HelpTest ID BLOD0978 Fetal Screen with Reflex to Fetaldex
Useful For
Detects D Positive fetal red cells in D Negative mothers.
AKA
Fetaldex
Specimen Type/Requirements
Pink top (EDTA) tube - Whole Blood (preferred)
Lavender top (EDTA) tube - Whole Blood
It is best to wait about an hour after delivery to allow fetal blood to mix thoroughly in the mom's circulation, but the specimen should be collected as soon as possible thereafter.
See Blood Bank Specimen Labeling Policy
Test is affected by gross hemolysis. Test is not affected by lipemia.
Specimen Volume
| Preferred Volume | 7.0 mL |
|---|---|
| Minimum Volume | 3.2 mL |
Stability/Transport
| Room Temperature | Not Acceptable | |
|---|---|---|
| Refrigerated | 48 hours | Preferred for transport |
| Frozen | Not Acceptable |
Performed Test Frequency
Monday through Sunday
Additional Information
If the infant’s red blood cells possess a weak D antigen, the test may not detect a feto-maternal hemorrhage exceeding 30 mL of whole blood.
Test will automatically reflex to Fetaldex on all
positive results. However after 24 hours,
test will not reflex to Fetaldex due to strict 24 hour
stability for Fetaldex.
Methodology
Immune Rosetting
Performing Lab
Sanford Laboratories Sioux Falls
CPT
85461