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 85339-0: Progesterone receptor Ag Immune stain Ql (Breast cancer specimen)

Name: LOINC Code 85339-0: Progesterone receptor Ag Immune stain Ql (Breast cancer specimen)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:13.315Z

85339-0 is a LOINC code used to identify Progesterone receptor Ag Immune stain Ql (Breast cancer specimen) 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 Progesterone receptor Ag. It is commonly used with the system or sample type Breast cancer specimen.

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 Progesterone receptor Ag. It is commonly used with the system or sample type Breast cancer specimen.

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: Immune stain

What it does not mean

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

Key facts

Progesterone receptor Ag [Presence] in Breast cancer specimen by Immune stain
Progesterone receptor Ag
Antigen; Antigens; Br ca spec; Brst; CA; Ca spec; IHC; Imm; Immunohistochemical stain; Immunostain; ImStn; Imun; Imune; Oncology; Ordinal; P4; Pathology; PGRA; Point in time; PR; PRA; Prog; Proges; Progest; Progestin; QL; Qual; Qualitative; Random; Rec; Recept; Receptors; Recp; Recptr; Screen; Spec; St; Stains; Stn

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

Progesterone receptor Ag Immune stain Ql (Breast cancer specimen)Progesterone receptor Ag [Presence] in Breast cancer specimen by Immune stainPR Ag Br ca spec Ql ImStnProgesterone receptor AgPATHProgesterone receptor antigen, Breast cancer specimenPrThr

Frequently asked questions

Code details

Code85339-0

SystemLOINC

Display nameProgesterone receptor Ag Immune stain Ql (Breast cancer specimen)

DescriptionProgesterone receptor Ag

Short namePR Ag Br ca spec Ql ImStn

ComponentProgesterone receptor Ag

PropertyPrThr

TimingPt

System (specimen)Breast cancer specimen

ScaleOrd

MethodImmune stain

ClassPATH

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.61

Last changed2.61

Consumer names

Progesterone receptor antigen, Breast cancer specimen

Part names

Progesterone receptor AgPrThrPtBreast cancer specimenOrdImmune stainPresence or ThresholdPoint in time (spot)

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.