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 94403-3: CHRNA3 gene c.645C>T genotype Molgen (Bld/Tiss)

Name: LOINC Code 94403-3: CHRNA3 gene c.645C>T genotype Molgen (Bld/Tiss)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:24.120Z

94403-3 is a LOINC code used to identify CHRNA3 gene c.645C>T genotype Molgen (Bld/Tiss) 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 CHRNA3 gene.c.645C>T. It is commonly used with the system or sample type Bld/Tiss.

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 CHRNA3 gene.c.645C>T. It is commonly used with the system or sample type Bld/Tiss.

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: Molgen

What it does not mean

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

Key facts

CHRNA3 gene c.645C>T [Genotype] in Blood or Tissue by Molecular genetics method Nominal

CHRNA3 gene.c.645C>T

The patient's genotype for the c.645C>T (D398N, rs1051730) variant in the CHRNA3 (nicotinic acetylcholine receptor alpha 3 subunit) gene. The rs1051730(T) allele is associated with nicotine dependence, cigarette consumption, smoking cessation, lung cancer risk, and COPD.[PMID26751916]

Blood; CHRNA3 c.645C>T; D398N; Genetics; Heredity; Heritable; Inherited; Molecular genetics; Molecular pathology; MOLPATH; MOLPATH.PHARMG; Nominal; PCR; Point in time; Random; rs1051730; T prime; Tissue; Tissue, unspecified; WB; Whole blood; Whole blood or Tissue

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

CHRNA3 gene c.645C>T genotype Molgen (Bld/Tiss)CHRNA3 gene c.645C>T [Genotype] in Blood or Tissue by Molecular genetics method NominalCHRNA3 c.645C>T Geno Bld/TCHRNA3 gene.c.645C>TMOLPATH.PHARMGCHRNA3 gene c.645C>T genotype, Blood or tissue specimenGeno

Frequently asked questions

Code details

Code94403-3

SystemLOINC

Display nameCHRNA3 gene c.645C>T genotype Molgen (Bld/Tiss)

DescriptionCHRNA3 gene.c.645C>T

Short nameCHRNA3 c.645C>T Geno Bld/T

ComponentCHRNA3 gene.c.645C>T

PropertyGeno

TimingPt

System (specimen)Bld/Tiss

ScaleNom

MethodMolgen

ClassMOLPATH.PHARMG

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.68

Last changed2.68

Consumer names

CHRNA3 gene c.645C>T genotype, Blood or tissue specimen

Part names

CHRNA3 gene.c.645C>TGenoPtBld/TissNomMolgenCHRNA3 gene c.645C>TGenotypePoint in time (spot)Blood or TissueMolecular genetics

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.