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 85529-6: PRRSV North American strain IgG IF Ql (S)

Name: LOINC Code 85529-6: PRRSV North American strain IgG IF Ql (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:13.315Z

85529-6 is a LOINC code used to identify PRRSV North American strain IgG IF Ql (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 Porcine reproductive and respiratory syndrome virus North American strain Ab.IgG. It is commonly used with the system or sample type Ser.

Reviewed by HealthAssure Clinical TeamUpdated 21 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 Porcine reproductive and respiratory syndrome virus North American strain Ab.IgG. 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: Observation
Method: IF

What it does not mean

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

Key facts

PRRSV North American strain IgG Ab [Presence] in Serum by Immunofluorescence

Porcine reproductive and respiratory syndrome virus North American strain Ab.IgG

The IFA method for antibody testing of Porcine reproductive and respiratory syndrome (PRRS) is fast and less expensive than other methods but can result in false positives so should be confirmed by virus isolation (VI) or RT-PCR methods. [http//lib.dr.iastate.edu/ cgi/viewcontent.cgi?article=4013&context=etd] It uses sample and control serums that are diluted and incubated on the PRRSV infected cells followed by examination using a fluorescent microscope for characteristic patterns of fluorescent staining.

Abortus blauw; ABS; Aby; ACIF; Antby; Anti; Antibodies; Antibody; Anticomplement Immunofluorescence; Autoantibodies; Autoantibody; Blue-eared pig disease; FA; Fluorescent antibody; Fluoresent; ID; IFA; Immune fluorescence; Immune globulin G; Immunoflour; Immunofluor; Immunofluorescence; Immunoglobulin G; Infectious Disease; InfectiousDisease; Lelystad virus; Microbiology; Mystery swine disease; Ordinal; Point in time; Porcine epidemic abortion & respiratory syndrome; Porcine reproductive and respiratory syndrome; Pork; PR; PRRS; PRRSV; PRRSV NA strain; Ql; Qual; Qualitative; Random; Screen; Serum; Seuchenhafter spatabort der schweine; SIRSV; SR; Swine; Swine infertility and respiratory syndrome; Syndrome dysgenesique et respiratoire porcin; Time Resolved Fluorescence; TRF; Vet; Veterinary

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

PRRSV North American strain IgG IF Ql (S)PRRSV North American strain IgG Ab [Presence] in Serum by ImmunofluorescencePRRSV NA strain IgG Ser Ql IFPorcine reproductive and respiratory syndrome virus North American strain Ab.IgGMICROPRRSV North american strain IgG antibody, BloodPrThr

Frequently asked questions

Code details

Code85529-6

SystemLOINC

Display namePRRSV North American strain IgG IF Ql (S)

DescriptionPorcine reproductive and respiratory syndrome virus North American strain Ab.IgG

Short namePRRSV NA strain IgG Ser Ql IF

ComponentPorcine reproductive and respiratory syndrome virus North American strain Ab.IgG

PropertyPrThr

TimingPt

System (specimen)Ser

ScaleOrd

MethodIF

ClassMICRO

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.61

Last changed2.64

Consumer names

PRRSV North american strain IgG antibody, Blood

Part names

Porcine reproductive and respiratory syndrome virus North American strain Ab.IgGPrThrPtSerOrdIFPRRSV North American strain IgGPresence or ThresholdPoint in time (spot)SerumImmunofluorescence (IF)

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.