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.

LOINCActiveBoth

LOINC Code 42909-2: Hemoglobin spec 1 Ql (Gast fld gastrointestinal)

Name: LOINC Code 42909-2: Hemoglobin spec 1 Ql (Gast fld gastrointestinal)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:28.586Z

42909-2 is a LOINC code used to identify Hemoglobin spec 1 Ql (Gast fld gastrointestinal) 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^1st specimen. It is commonly used with the system or sample type Gast fld^Patient.gastrointestinal.

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^1st specimen. It is commonly used with the system or sample type Gast fld^Patient.gastrointestinal.

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: Both

What it does not mean

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

Key facts

Hemoglobin [Presence] in Gastric fluid from gastrointestinal --1st specimen
Hemoglobin^1st specimen
Acute specimen; Chemistry; First; GAST; gast fld pat; Gastric contents; Gastric fluid; Haemoglobin; Hb; Hgb; Ordinal; Point in time; PR; Pre immunization; QL; Qual; Qualitative; Random; Screen; sp1; Spec

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 1 Ql (Gast fld gastrointestinal)Hemoglobin [Presence] in Gastric fluid from gastrointestinal --1st specimenHgb sp1 Gast gastro QlHemoglobin^1st specimenCHEMHemoglobin specimen 1, gastrointestinal Stomach fluidPrThr

Frequently asked questions

Code details

Code42909-2

SystemLOINC

Display nameHemoglobin spec 1 Ql (Gast fld gastrointestinal)

DescriptionHemoglobin^1st specimen

Short nameHgb sp1 Gast gastro Ql

ComponentHemoglobin^1st specimen

PropertyPrThr

TimingPt

System (specimen)Gast fld^Patient.gastrointestinal

ScaleOrd

ClassCHEM

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.16

Last changed2.82

Consumer names

Hemoglobin specimen 1, gastrointestinal Stomach fluid

Part names

Hemoglobin^1st specimenPrThrPtGast fld^Patient.gastrointestinalOrdPresence or ThresholdPoint in time (spot)

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.