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 75215-4: Ornithine/Citrulline (DBS) [Molar ratio]

Name: LOINC Code 75215-4: Ornithine/Citrulline (DBS) [Molar ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

75215-4 is a LOINC code used to identify Ornithine/Citrulline (DBS) [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 Ornithine/Citrulline. It is commonly used with the system or sample type Bld.dot.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Ornithine/Citrulline. It is commonly used with the system or sample type Bld.dot.

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

Ornithine/Citrulline [Molar ratio] in DBS
Ornithine/Citrulline
Ornithine/Citrulline is a marker for gyrate atrophy of the retina, ornithine transcarbamylase deficiency, carbamoyl-phosphate synthase deficiency, and hyperornithinemia-hyperammonemia-homocitrullinuria syndrome, which are all conditions that some states include on their newborn screening panel.
Blood; Chemistry; CIT; Citr; DBS; Dried blood spot; Filter paper; FP; Orn; Point in time; QNT; Quan; Quant; Quantitative; Random; Scrto; Substance concentration ratio; Substance ratio; WB; Whole blood

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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Ornithine/Citrulline (DBS) [Molar ratio] (75215-4)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Ornithine/Citrulline (DBS) [Molar ratio]Ornithine/Citrulline [Molar ratio] in DBSOrnithine/Cit DBS-sRtoOrnithine/CitrullineCHEMOrnithine/Citrulline, Dried blood spotSRto

Frequently asked questions

Code details

Code75215-4

SystemLOINC

Display nameOrnithine/Citrulline (DBS) [Molar ratio]

DescriptionOrnithine/Citrulline

Short nameOrnithine/Cit DBS-sRto

ComponentOrnithine/Citrulline

PropertySRto

TimingPt

System (specimen)Bld.dot

ScaleQn

ClassCHEM

Example unitsratio

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.48

Last changed2.73

Consumer names

Ornithine/Citrulline, Dried blood spot

Part names

Ornithine/CitrullineSRtoPtBld.dotQnSubstance RatioPoint in time (spot)DBS

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.