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 79649-0: Homocysteine cysteine disulfide/Creatinine (U) [Molar ratio]

Name: LOINC Code 79649-0: Homocysteine cysteine disulfide/Creatinine (U) [Molar ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:01.838Z

79649-0 is a LOINC code used to identify Homocysteine cysteine disulfide/Creatinine (U) [Molar ratio] 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 Homocysteine cysteine disulfide/Creatinine. It is commonly used with the system or sample type Urine.

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 Homocysteine cysteine disulfide/Creatinine. It is commonly used with the system or sample type Urine.

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

What it does not mean

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

Key facts

Homocysteine cysteine disulfide/Creatinine [Molar ratio] in Urine
Homocysteine cysteine disulfide/Creatinine
2-amino-4-[(2-amino-2-carboxyethyl)disulfanyl]butanoic acid; Chemistry; CR; Crea; Creat; Cys; Cys-homo-Cys-mixed disulfide; Cysteine-homocysteine mixed disulfide; Cysteinylhomocysteine mixed disulfide; Esoteric; HCY; Hcys; Hcyst; Homocyst(e)ine; Homocysteine-cysteine mixed disulfide; Hycs-Cys diS; Hycs-Cys Disulfide; Point in time; QNT; Quan; Quant; Quantitative; Random; Scrto; Substance concentration ratio; Substance ratio; UA; UCr; UR; Urn

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

Homocysteine cysteine disulfide/Creatinine (U) [Molar ratio]Homocysteine cysteine disulfide/Creatinine [Molar ratio] in UrineHycs-Cys diS/Creat Ur-sRtoHomocysteine cysteine disulfide/CreatinineCHEMHomocysteine cysteine disulfide/Creatinine, UrineSRto

Frequently asked questions

Code details

Code79649-0

SystemLOINC

Display nameHomocysteine cysteine disulfide/Creatinine (U) [Molar ratio]

DescriptionHomocysteine cysteine disulfide/Creatinine

Short nameHycs-Cys diS/Creat Ur-sRto

ComponentHomocysteine cysteine disulfide/Creatinine

PropertySRto

TimingPt

System (specimen)Urine

ScaleQn

ClassCHEM

Example unitsumol/mmol creatinine

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.54

Last changed2.56

Consumer names

Homocysteine cysteine disulfide/Creatinine, Urine

Part names

Homocysteine cysteine disulfide/CreatinineSRtoPtUrineQnSubstance RatioPoint 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.