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LOINC Code 33203-1: Amyloid beta 42 peptide (CSF) [Mass/Vol]

33203-1 is a LOINC code used to identify Amyloid beta 42 peptide (CSF) [Mass/Vol] 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 Amyloid beta 42 peptide. 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 Amyloid beta 42 peptide. 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

  • Amyloid beta 42 peptide [Mass/volume] in Cerebral spinal fluid
  • Amyloid beta 42 peptide
  • Ab42 peptide; Abeta; Abeta 42; AL beta42; Alzheimer disease; Alzheimer's disease; B; Beta-amyloid; Cerebral spinal fluid; Cerebrospinal Fl; Chemistry; Level; Mass concentration; Pept; Point in time; QNT; Quan; Quant; Quantitative; Random; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid

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

Amyloid beta 42 peptide (CSF) [Mass/Vol]Amyloid beta 42 peptide [Mass/volume] in Cerebral spinal fluidAL beta42 CSF-mCncAmyloid beta 42 peptideCHEMAmyloid beta 42 peptide, Spinal fluidMCnc

Frequently asked questions

Code details

Code33203-1
SystemLOINC
Display nameAmyloid beta 42 peptide (CSF) [Mass/Vol]
DescriptionAmyloid beta 42 peptide
Short nameAL beta42 CSF-mCnc
ComponentAmyloid beta 42 peptide
PropertyMCnc
TimingPt
System (specimen)CSF
ScaleQn
ClassCHEM
Example unitspg/mL
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.09
Last changed2.73

Consumer names

Amyloid beta 42 peptide, Spinal fluid

Part names

Amyloid beta 42 peptideMCncPtCSFQnMass ConcentrationPoint 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.

LOINC Code 33203-1 | HealthAssure