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LOINC Code 43203-9: Parainfluenza virus 1 Ab CF (CSF) [Titer]

43203-9 is a LOINC code used to identify Parainfluenza virus 1 Ab CF (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 Parainfluenza virus 1 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 Parainfluenza virus 1 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: Comp fix

What it does not mean

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

Key facts

  • Parainfluenza virus 1 Ab [Titer] in Cerebral spinal fluid by Complement fixation
  • Parainfluenza virus 1 Ab
  • ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Cerebral spinal fluid; Cerebrospinal Fl; CF; Comp fixation; Compfix; Complement fixation; Dilution factor; Dilution Factor (Titer); HPIV; HPIV1; Human respirovirus 1; i; ID; Infectious Disease; InfectiousDisease; Microbiology; Neuro; Neurology; Para; Parainflu; Parainfluenza type 1; Parainfluenza type I; PI1; Point in time; Random; 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

Parainfluenza virus 1 Ab CF (CSF) [Titer]Parainfluenza virus 1 Ab [Titer] in Cerebral spinal fluid by Complement fixationHPIV1 Ab Titr CSF CFParainfluenza virus 1 AbMICROParainfluenza virus 1 antibody, Spinal fluidTitr

Frequently asked questions

Code details

Code43203-9
SystemLOINC
Display nameParainfluenza virus 1 Ab CF (CSF) [Titer]
DescriptionParainfluenza virus 1 Ab
Short nameHPIV1 Ab Titr CSF CF
ComponentParainfluenza virus 1 Ab
PropertyTitr
TimingPt
System (specimen)CSF
ScaleSemiQn
MethodComp fix
ClassMICRO
Example unitstiter
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.17
Last changed2.75

Consumer names

Parainfluenza virus 1 antibody, Spinal fluid

Part names

Parainfluenza virus 1 AbTitrPtCSFSemiQnComp fixTiterPoint in time (spot)Cerebral spinal fluidComplement fixation

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 43203-9 | HealthAssure