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LOINC Code 40542-3: Rubella virus Ab LA (CSF) [Titer]

40542-3 is a LOINC code used to identify Rubella virus Ab LA (CSF) [Titer] 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 Rubella virus Ab. 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 Rubella virus Ab. 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
  • Method: LA

What it does not mean

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

Key facts

  • Rubella virus Ab [Titer] in Cerebral spinal fluid by Latex agglutination
  • Rubella virus Ab
  • ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Cerebral spinal fluid; Cerebrospinal Fl; Congenital rubella syndrome; Dilution factor; Dilution Factor (Titer); German measles; ID; Infectious Disease; InfectiousDisease; LAT; Latex agglutination; Microbiology; Neuro; Neurology; Point in time; Random; RUBV; SmQn; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Titer; Titered; Titre; Ttr

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

Rubella virus Ab LA (CSF) [Titer]Rubella virus Ab [Titer] in Cerebral spinal fluid by Latex agglutinationRUBV Ab Titr CSF LARubella virus AbMICRORubella virus antibody, Spinal fluidTitr

Frequently asked questions

Code details

Code40542-3
SystemLOINC
Display nameRubella virus Ab LA (CSF) [Titer]
DescriptionRubella virus Ab
Short nameRUBV Ab Titr CSF LA
ComponentRubella virus Ab
PropertyTitr
TimingPt
System (specimen)CSF
ScaleSemiQn
MethodLA
ClassMICRO
Example unitstiter
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.15
Last changed2.75

Consumer names

Rubella virus antibody, Spinal fluid

Part names

Rubella virus AbTitrPtCSFSemiQnLATiterPoint in time (spot)Cerebral spinal fluidLatex agglutination

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.