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Fetal Cells, Quantitative

Item Value
Approval req'd? Yes, contact Hematology x3-1747. If requesting testing on adult females of child-bearing age.
Available Stat? No
Test code FETC
Performed by Parnassus Hematology
In House Availability Test run 0800-1500 Monday-Friday
Method Modified Acid Elution as described by Kleihauer-Betke and modified by Clayton.
Collection Instructions Complete appropriate requisition and request "Fetal cells, Quantitative"
Container type Lavender top, CSF tube or sterile collection tube
Amount to Collect 1 mL blood
Sample type EDTA whole blood, Body Fluid, CSF
Preferred volume 1 mL blood, Body fluid or CSF
Processing notes If test cannot be performed immediately refrigerate sample.
Normal range See Additional Information
Synonyms Kleihauer-Betke Test; Acid elution test; Alkali Denaturation; Betke test; fetal RBC's; Kleihauer test
Stability Blood refrigerated 48 hours. CSF and Body fluids refrigerated 4-6 hours.
Turn around times Same day or next weekday.
Additional information Testing for a feto-maternal bleed will NOT be done in the case of an Rh+ infant born to an Rh- mother if the more sensitive Fetal Bleed Screen (rosetting test) run by the Blood Bank is negative.

Other anticoagulants or clotted blood may be used if necessary. A blood sample must be submitted at the same time and tested in parallel with CSF or BF. Each specimen examined is charged separately.

References:
Brecher M, ed. Technical Manual, 15th ed. Bethesda, Maryland: American Association of Blood Banks, 2005.
Petrides, M. Practical Guide to Transfusion Medicine, 2nd. Bethesda, Maryland: AABB Press, 2007
CPT coding 85460
LOINC code 48556-5
Last Updated 11/21/2013 12:49:32 PM
Entry Number 379
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