Test Overview
Test Methodology

Rosette test to detect more than 15 mL of Rh positive fetal red cells in an Rh negative mother.

Test Usage

Screening to assess the magnitude of fetal-maternal hemorrhage for Rh Immune Globulin therapy and to determine the need for additional testing.

Reference Range *

Negative

Test Details
Days Set Up
Daily, 24 hours
Analytic Time

4 - 8 hours (STAT processing not available)

Soft Order Code
FMHG
MiChart Code
Fetal Maternal Hemorrhage Screen
Synonyms
  • FMHG
  • FETOMATERNAL HEMORRHAGE GAMMA
  • Rosette Test
  • FMH
Laboratory
Blood Bank
Section
Blood Bank
Specimen Requirements
Collection Instructions

Collect specimen at least 1 hour after delivery in a pink top tube. Send intact specimen at room temperature; do not freeze. Specimens clotted, diluted with IV fluid, or in underfilled or improper tubes will be rejected.

Pink Top Tube
Normal Volume
3 mL whole blood
Minimum Volume
2 mL whole blood
Storage Temperature
R
Additional Information

If the Fetal Maternal Hemorrhage Screen is positive, a Kleihauer-Betke (K-B) test will be performed automatically at an additional charge. By ordering this test the clinician acknowledges that additional reflex testing will be performed and billed at a separate additional charge if indicated.

Billing
CPT Code
85461
Fee Code
21261
NY State Approved
No