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.

LOINCObservation

LOINC Code 30033-5: Homocystine 6 Hr post dose methionine [Moles/Vol]

Name: LOINC Code 30033-5: Homocystine 6 Hr post dose methionine [Moles/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:16.074Z

30033-5 is a LOINC code used to identify Homocystine 6 Hr post dose methionine [Moles/Vol] 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 Homocystine^6H post dose methionine. It is commonly used with the system or sample type Ser/Plas.

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 Homocystine^6H post dose methionine. It is commonly used with the system or sample type Ser/Plas.

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: DEPRECATED
Order vs observation: Observation

What it does not mean

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

Key facts

Deprecated Homocystine [Moles/volume] in Serum or Plasma --6 hours post dose methionine
Homocystine^6H post dose methionine
(Hcys)2; >6h; 6h p Met; After; CHEMISTRY.CHALLENGE TESTING; Homocyst(e)ine; Homocystin; Level; Met; Methionine load test; p dose; Pl; Plasma; Plsm; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Substance concentration

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

Homocystine 6 Hr post dose methionine [Moles/Vol]Deprecated Homocystine [Moles/volume] in Serum or Plasma --6 hours post dose methionineDeprecated (Hcys)2 6h p Met SerPl-sCncHomocystine^6H post dose methionineCHALHomocystine 6 hr after Methionine, BloodSCnc

Frequently asked questions

Code details

Code30033-5

SystemLOINC

Display nameHomocystine 6 Hr post dose methionine [Moles/Vol]

DescriptionHomocystine^6H post dose methionine

Short nameDeprecated (Hcys)2 6h p Met SerPl-sCnc

ComponentHomocystine^6H post dose methionine

PropertySCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHAL

Example unitsumol/L

StatusDEPRECATED

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.04

Last changed2.70

Consumer names

Homocystine 6 hr after Methionine, Blood

Part names

Homocystine^6H post dose methionineSCncPtSer/PlasQnSubstance ConcentrationPoint in time (spot)Serum or Plasma

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.