What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINC

LOINC Code 4634-2: Hemoglobin.fetal Kleihauer-Betke method Nom (RBC)

Name: LOINC Code 4634-2: Hemoglobin.fetal Kleihauer-Betke method Nom (RBC)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:31.117Z

4634-2 is a LOINC code used to identify Hemoglobin.fetal Kleihauer-Betke method Nom (RBC) in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Hemoglobin.fetal. It is commonly used with the system or sample type RBC.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Hemoglobin.fetal. It is commonly used with the system or sample type RBC.

When is it used?

Used in lab systems, EHRs, and clinical data exchange.
May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
Status: DEPRECATED
Method: Kleihauer-Betke

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Deprecated Hemoglobin F/Hemoglobin.total in Blood by Kleihauer-Betke method
Hemoglobin.fetal
Acid elution; Arbitrary concentration; Erythrocytes; Fetal maternal hemorrhage screen; Haemoglobin; Hb; HEMATOLOGY/CELL COUNTS; Hgb; KB; Kleih Betke; Kleihauer stain; Kleihauer test; Kleihauer-Betke stain; Kleihauer-Betke test; Kleihauer-Braun-Betke; Nominal; Point in time; Random; Red blood cells; Red blood corpusles

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Hemoglobin.fetal Kleihauer-Betke method Nom (RBC)Deprecated Hemoglobin F/Hemoglobin.total in Blood by Kleihauer-Betke methodDeprecated HgB RBC Kleih BetkeHemoglobin.fetalHEM/BCHemoglobin.fetal, Red blood cellsACnc

Frequently asked questions

Code details

Code4634-2

SystemLOINC

Display nameHemoglobin.fetal Kleihauer-Betke method Nom (RBC)

DescriptionHemoglobin.fetal

Short nameDeprecated HgB RBC Kleih Betke

ComponentHemoglobin.fetal

PropertyACnc

TimingPt

System (specimen)RBC

ScaleNom

MethodKleihauer-Betke

ClassHEM/BC

StatusDEPRECATED

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.36

Consumer names

Hemoglobin.fetal, Red blood cells

Part names

Hemoglobin.fetalACncPtRBCNomKleihauer-BetkeArbitrary ConcentrationPoint in time (spot)Red Blood CellsKleihauer-Betke method

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.