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 79164-0: CES1 gene c.428G>A Molgen Ql (Bld/Tiss)

Name: LOINC Code 79164-0: CES1 gene c.428G>A Molgen Ql (Bld/Tiss)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:00.209Z

79164-0 is a LOINC code used to identify CES1 gene c.428G>A Molgen Ql (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 CES1 gene.c.428G>A. 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 CES1 gene.c.428G>A. 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: Both
Method: Molgen

What it does not mean

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

Key facts

CES1 gene c.428G>A [Presence] in Blood or Tissue by Molecular genetics method

CES1 gene.c.428G>A

The CES1 gene encodes carboxylesterase 1A1 (CES1A1), which is the key enzyme involved in the first-pass metabolism of methylphenidate (Ritalin). Presence of the CES1 Gly143Glu missense variant (c.428G>A, [NCBI dbSNP IDrs71647871]) results in decreased CES1A1 activity, which may lead to a higher than expected plasma concentration of methylphenidate and increase the risk of side effects.

Blood; carboxylesterase 1; CE-1; CEH; CES1 c.428G>A; CES2; Genetics; hCE-1; Heredity; Heritable; HMSE; HMSE1; Inherited; Molecular genetics; Molecular pathology; MOLPATH; MOLPATH.MUTATIONS; Ordinal; PCE-1; PCR; Point in time; PR; QL; Qual; Qualitative; Random; REH; Screen; SES1; TGH; 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

CES1 gene c.428G>A Molgen Ql (Bld/Tiss)CES1 gene c.428G>A [Presence] in Blood or Tissue by Molecular genetics methodCES1 c.428G>A Bld/T QlCES1 gene.c.428G>AMOLPATH.MUTCES1 gene c.428G>A, Blood or tissue specimenPrThr

Frequently asked questions

Code details

Code79164-0

SystemLOINC

Display nameCES1 gene c.428G>A Molgen Ql (Bld/Tiss)

DescriptionCES1 gene.c.428G>A

Short nameCES1 c.428G>A Bld/T Ql

ComponentCES1 gene.c.428G>A

PropertyPrThr

TimingPt

System (specimen)Bld/Tiss

ScaleOrd

MethodMolgen

ClassMOLPATH.MUT

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.54

Last changed2.61

Consumer names

CES1 gene c.428G>A, Blood or tissue specimen

Part names

CES1 gene.c.428G>APrThrPtBld/TissOrdMolgenCES1 gene c.428G>APresence or ThresholdPoint 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.