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 79574-0: Folate and tryptophan and metabolites pattern Nar (CSF) [Interp]

Name: LOINC Code 79574-0: Folate and tryptophan and metabolites pattern Nar (CSF) [Interp]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:01.837Z

79574-0 is a LOINC code used to identify Folate and tryptophan and metabolites pattern Nar (CSF) [Interp] 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 Folate & tryptophan & metabolites pattern. It is commonly used with the system or sample type CSF.

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 Folate & tryptophan & metabolites pattern. 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

Folate and tryptophan and metabolites pattern [Interpretation] in Cerebral spinal fluid Narrative

Folate & tryptophan & metabolites pattern

Testing for folate and its metabolites as well as tryptophan and its metabolites in CSF can be useful in distinguishing among various central nervous system disorders associated with folate deficiency. Low folate levels are associated with inborn errors of metabolism, including cerebral folate deficiency (CFD), a neurological syndrome that occurs around 2-4 months of age and is primarily associated with associated with low levels of 5-methyltetrahydrofolate (5-MTHF) in the CSF with normal folate levels in the plasma and red blood cells.[PMID19260931] Low folate levels are also associated with depression and dementia in elderly patients.[PMID: 11183038] Serotonin, which is formed from tryptophan, may be the link between folate and depression or dementia. Many patients with neuropsychiatric disorders and folate deficiency have also been found to have low levels of 5-hydroxyindoleacetic acid (5-HIAA, a serotonin metabolite), and patients with 5,10-methylenetetrahydrofolate reductase (MTHFR) deficiency also have decreased serotonin synthesis. [PMCID: 1810582]

c244; Cerebral spinal fluid; Cerebrospinal Fl; Chemistry; Folat; Folate + Tryp + Metabs Pattern; Folic acid; Impression; Impression/interpretation of study; Impressions; Interp; Interpretation; L-tryptophan; Metabolite; Metb; Narrative; Point in time; Pteroylglutamate; Pteroylglutamic acid; Random; Report; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Trp; Vit M; Vitamin M

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

Folate and tryptophan and metabolites pattern Nar (CSF) [Interp]Folate and tryptophan and metabolites pattern [Interpretation] in Cerebral spinal fluid NarrativeFolate + Tryp + Metabs Pattern CSF-ImpFolate & tryptophan & metabolites patternCHEMInterpretation of Folate and Tryptophan and Metabolites pattern test result, Spinal fluidImp

Frequently asked questions

Code details

Code79574-0

SystemLOINC

Display nameFolate and tryptophan and metabolites pattern Nar (CSF) [Interp]

DescriptionFolate & tryptophan & metabolites pattern

Short nameFolate + Tryp + Metabs Pattern CSF-Imp

ComponentFolate & tryptophan & metabolites pattern

PropertyImp

TimingPt

System (specimen)CSF

ScaleNar

ClassCHEM

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.54

Last changed2.54

Consumer names

Interpretation of Folate and Tryptophan and Metabolites pattern test result, Spinal fluid

Part names

Folate & tryptophan & metabolites patternImpPtCSFNarFolate and tryptophan and metabolites patternImpression/interpretation of studyPoint 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.