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Test Code 7044 Fetal Red Cell Percentage by Flow Cytometry

Performing Laboratory

Barnes-Jewish Hospital Laboratory


Flow Cytometry
Note: Fetal hemoglobin will be performed by the Kleihauer-Betke method under the following circumstances: 


1. Routine requests that cannot be completed within 24 hours of receipt.


2. STAT requests received on weekends, holidays, or between the hours of 2100 and 0700, Monday through Friday.



If  the Kleihauer-Betke is positive then a temporary verbal result will be called.  Flow cytometry will be performed the next working day to confirm the Kleihauer-Betke result.  If the Kleihauer-Betke is negative the Fetal Red Cell Percentage by Flow Cytometry will be cancelled and the Kleihauer-Betke result will be reported.




Literature References:

1. Fetal Red Cell Detection: Approved Guideline: NCCLS Volume 21 Number 26.
2. Mundee Y, Bigelow N, Davis B, Porter J. Simplified flow cytometric method for fetal hemoglobin Containing red blood cells. Cytometry (Communication in Clinical Cytometry) 2000;42:389-93.

Specimen Requirements

Specimen Type: Whole blood

Container/Tube: Lavender top (EDTA)

Specimen Volume: Full tube

Specimen Minimum Volume: 1 mL

Day(s) Test Set Up

Monday through Friday

Cut-off time: 2100
Turnaround Time:
STAT: 3 hours after receipt in laboratory 
Routine: 24 hours after receipt in laboratory

Reference Values


Test Classification and CPT Coding


Additional Information

For BJH Laboratory Use Only
Analyte Stability:

72 hours, refrigerated

Laboratory Processing Instructions:

Test performed in BJH Flow Cytometry.

Specimen Transport Temperature

Ambient/Refrigerate <72 hours OK

LOINC Code Information

Name LOINC Code
Fetal Red Cell Percentage 48556-5