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.

LOINCActiveObservation

LOINC Code 56491-4: Hemoglobin spec 3 IA Ql (Stl gastrointestinal lower)

Name: LOINC Code 56491-4: Hemoglobin spec 3 IA Ql (Stl gastrointestinal lower)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:38.261Z

56491-4 is a LOINC code used to identify Hemoglobin spec 3 IA Ql (Stl gastrointestinal lower) 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^3rd specimen. It is commonly used with the system or sample type Stool^Patient.gastrointestinal.lower.

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^3rd specimen. It is commonly used with the system or sample type Stool^Patient.gastrointestinal.lower.

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: ACTIVE
Order vs observation: Observation
Method: IA

What it does not mean

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

Key facts

Hemoglobin [Presence] in Stool from gastrointestinal lower by Immunoassay --3rd specimen
Hemoglobin^3rd specimen
Bowel movement; Chemistry; EIA; ELFA; ELISA; Enzyme immunoassay; Faecal; Faeces; Fecal; Feces; gastro lower; Haemoglobin; Hb; Hemoccult gastro lower; Hemoglobin 3; Hgb; IAA; Low; MEIA; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; sp3; Spec; Stl; Stool = Fecal; SUDS

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 spec 3 IA Ql (Stl gastrointestinal lower)Hemoglobin [Presence] in Stool from gastrointestinal lower by Immunoassay --3rd specimenHgb sp3 Stl gastro lower Ql IAHemoglobin^3rd specimenCHEMHemoglobin specimen 3, gastrointestinal lower StoolPrThr

Frequently asked questions

Code details

Code56491-4

SystemLOINC

Display nameHemoglobin spec 3 IA Ql (Stl gastrointestinal lower)

DescriptionHemoglobin^3rd specimen

Short nameHgb sp3 Stl gastro lower Ql IA

ComponentHemoglobin^3rd specimen

PropertyPrThr

TimingPt

System (specimen)Stool^Patient.gastrointestinal.lower

ScaleOrd

MethodIA

ClassCHEM

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.29

Last changed2.82

Consumer names

Hemoglobin specimen 3, gastrointestinal lower Stool

Part names

Hemoglobin^3rd specimenPrThrPtStool^Patient.gastrointestinal.lowerOrdIAPresence or ThresholdPoint in time (spot)Immunoassay

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.