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 53112-9: C0/Total carnitine (Amn fld) [Molar fraction]

Name: LOINC Code 53112-9: C0/Total carnitine (Amn fld) [Molar fraction]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

53112-9 is a LOINC code used to identify C0/Total carnitine (Amn fld) [Molar fraction] 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 Carnitine.free (C0)/Carnitine.total. It is commonly used with the system or sample type Amnio fld.

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 Carnitine.free (C0)/Carnitine.total. It is commonly used with the system or sample type Amnio fld.

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

Carnitine free (C0)/Carnitine.total in Amniotic fluid
Carnitine.free (C0)/Carnitine.total
AF; Amn; Amn fl; Amnio; Amniotic flu; Amniotic fluid; C0; Carnitine Free; Carnitine.total; Chemistry; FC; FR; Non-protein bound; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random; Substance fraction; TC; Tot; Totl

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 C0/Total carnitine (Amn fld) [Molar fraction] (53112-9)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

C0/Total carnitine (Amn fld) [Molar fraction]Carnitine free (C0)/Carnitine.total in Amniotic fluidCarnitine Free SFr AmnCarnitine.free (C0)/Carnitine.totalCHEMC0/Total Carnitine, Amniotic fluidSFr

Frequently asked questions

Code details

Code53112-9

SystemLOINC

Display nameC0/Total carnitine (Amn fld) [Molar fraction]

DescriptionCarnitine.free (C0)/Carnitine.total

Short nameCarnitine Free SFr Amn

ComponentCarnitine.free (C0)/Carnitine.total

PropertySFr

TimingPt

System (specimen)Amnio fld

ScaleQn

ClassCHEM

Example units%

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.24

Last changed2.70

Consumer names

C0/Total Carnitine, Amniotic fluid

Part names

Carnitine.free (C0)/Carnitine.totalSFrPtAmnio fldQnSubstance FractionPoint in time (spot)Amniotic fluid

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.