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 31551-5: Parainfluenza virus 2 IgM Qn (S)

Name: LOINC Code 31551-5: Parainfluenza virus 2 IgM Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

31551-5 is a LOINC code used to identify Parainfluenza virus 2 IgM Qn (S) 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 2 Ab.IgM. It is commonly used with the system or sample type Ser.

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 2 Ab.IgM. It is commonly used with the system or sample type Ser.

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

Parainfluenza virus 2 IgM Ab [Units/volume] in Serum
Parainfluenza virus 2 Ab.IgM
ABS; Aby; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; HPIV; HPIV2; Human rubulavirus 2; ID; II; Immune globulin M; Immunoglobulin M; Infectious Disease; InfectiousDisease; Microbiology; Para; Parainflu; Parainfluenza type 2; Parainfluenza type II; PI2; Point in time; QNT; Quan; Quant; Quantitative; Random; Serum; SR

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 Parainfluenza virus 2 IgM Qn (S) (31551-5)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Parainfluenza virus 2 IgM Qn (S)Parainfluenza virus 2 IgM Ab [Units/volume] in SerumHPIV2 IgM Ser-aCncParainfluenza virus 2 Ab.IgMMICROParainfluenza virus 2 IgM antibody, BloodACnc

Frequently asked questions

Code details

Code31551-5

SystemLOINC

Display nameParainfluenza virus 2 IgM Qn (S)

DescriptionParainfluenza virus 2 Ab.IgM

Short nameHPIV2 IgM Ser-aCnc

ComponentParainfluenza virus 2 Ab.IgM

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.07

Last changed2.69

Consumer names

Parainfluenza virus 2 IgM antibody, Blood

Part names

Parainfluenza virus 2 Ab.IgMACncPtSerQnParainfluenza virus 2 IgMArbitrary ConcentrationPoint in time (spot)Serum

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.