Test Overview
Test Methodology

Acid Elution

Test Usage

To assess the magnitude of fetal-maternal hemorrhage.

Reference Range *

0.00 - 0.20 %

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Daily, 24 hours
Analytic Time

2 - 4 hours

Soft Order Code
KBT
MiChart Code
Hemoglobin, Fetal
Synonyms
  • Acid Elution for Fetal Hemoglobin
  • Fetal Hemoglobin
  • Hemoglobin F (Fetal)
  • Hgb F
  • Kleihauer-Betke (KB)
  • Fetal Maternal Hemorrhage
Laboratory
Hematopathology
Section
Hematology
STAT Availability

STAT requests for this test will be performed on a STAT basis (supervisory staff approval is not required).

Specimen Requirements
Collection Instructions

Collect specimen in a lavender top EDTA K2 Vacutainer® tube as soon after delivery or incident as possible. Refrigerate and send intact within 24 hours of collection. Due to transit time this test is not recommended for clients sending via FedEx or UPS. If the specimen must be sent via overnight courier, please notify MLabs Client Services prior to sending and provide the patient's name and tracking number.

Alternate Specimen

Any EDTA K2 collection tube is acceptable, including, but not limited to Pink top EDTA K2 and Tan top EDTA K2 tubes.

Normal Volume

3 mL EDTA K2 whole blood

Minimum Volume

1 mL EDTA K2 whole blood

Rejection Criteria
Specimens clotted, diluted with IV fluid, or in improper tubes will be rejected. Liquid EDTA K3 collection tubes are not acceptable due to possible dilutional effects.
Billing
CPT Code
85460
Fee Code
22315
NY State Approved
No