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 47681-2: Leucine/Total AA (CSF) [Molar fraction]

Name: LOINC Code 47681-2: Leucine/Total AA (CSF) [Molar fraction]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

47681-2 is a LOINC code used to identify Leucine/Total AA (CSF) [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 Leucine/Amino acids.total. It is commonly used with the system or sample type CSF.

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 Leucine/Amino acids.total. It is commonly used with the system or sample type CSF.

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

Leucine/Amino acids.total in Cerebral spinal fluid
Leucine/Amino acids.total
AA; Acd; Acid; Amino acid; Amino acids.total; Cerebral spinal fluid; Cerebrospinal Fl; Chemistry; Leu; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Substance fraction; 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 Leucine/Total AA (CSF) [Molar fraction] (47681-2)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Leucine/Total AA (CSF) [Molar fraction]Leucine/Amino acids.total in Cerebral spinal fluidLeucine SFr CSFLeucine/Amino acids.totalCHEMLeucine/Total Amino Acids, Spinal fluidSFr

Frequently asked questions

Code details

Code47681-2

SystemLOINC

Display nameLeucine/Total AA (CSF) [Molar fraction]

DescriptionLeucine/Amino acids.total

Short nameLeucine SFr CSF

ComponentLeucine/Amino acids.total

PropertySFr

TimingPt

System (specimen)CSF

ScaleQn

ClassCHEM

Example units%

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.21

Last changed2.70

Consumer names

Leucine/Total Amino Acids, Spinal fluid

Part names

Leucine/Amino acids.totalSFrPtCSFQnSubstance FractionPoint in time (spot)Cerebral spinal 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.