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 58463-1: Tau protein (CSF) [Mass fraction]

Name: LOINC Code 58463-1: Tau protein (CSF) [Mass fraction]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

58463-1 is a LOINC code used to identify Tau protein (CSF) [Mass 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 Tau protein/Protein.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 Tau protein/Protein.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: Observation

What it does not mean

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

Key facts

Tau protein/Protein.total in Cerebral spinal fluid
Tau protein/Protein.total
Alzheimer disease; Alzheimer's disease; Cerebral spinal fluid; Cerebrospinal Fl; Chemistry; Mass Fraction; Neuro; Neurology; Percent; Point in time; PR; Prot; QNT; Quan; Quant; Quantitative; Random; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Tot; Totl; TP

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 Tau protein (CSF) [Mass fraction] (58463-1)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Tau protein (CSF) [Mass fraction]Tau protein/Protein.total in Cerebral spinal fluidTau Prot MFr CSFTau protein/Protein.totalCHEMTau protein, Spinal fluidMFr

Frequently asked questions

Code details

Code58463-1

SystemLOINC

Display nameTau protein (CSF) [Mass fraction]

DescriptionTau protein/Protein.total

Short nameTau Prot MFr CSF

ComponentTau protein/Protein.total

PropertyMFr

TimingPt

System (specimen)CSF

ScaleQn

ClassCHEM

Example units%

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.32

Last changed2.73

Consumer names

Tau protein, Spinal fluid

Part names

Tau protein/Protein.totalMFrPtCSFQnMass 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.