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 19198-1: Prostate specific Ag Qn (Sem)

Name: LOINC Code 19198-1: Prostate specific Ag Qn (Sem)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

19198-1 is a LOINC code used to identify Prostate specific Ag Qn (Sem) 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 Prostate specific Ag. It is commonly used with the system or sample type Semen.

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 Prostate specific Ag. It is commonly used with the system or sample type Semen.

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

Prostate specific Ag [Units/volume] in Semen
Prostate specific Ag
Antigen; Antigens; Arbitrary concentration; Chemistry; Ejaculate; Genitourinary; GU; Kallikrein 3; Oncology; P-30 antigen; Point in time; PS; PSA; QNT; Quan; Quant; Quantitative; Random; Sem; Seminal fluid; Seminin; Smn; SMPLS; Spec; Tumor marker; URO; Urology

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 Prostate specific Ag Qn (Sem) (19198-1)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Prostate specific Ag Qn (Sem)Prostate specific Ag [Units/volume] in SemenPSA Smn-aCncProstate specific AgCHEMProstate specific antigen, SemenACnc

Frequently asked questions

Code details

Code19198-1

SystemLOINC

Display nameProstate specific Ag Qn (Sem)

DescriptionProstate specific Ag

Short namePSA Smn-aCnc

ComponentProstate specific Ag

PropertyACnc

TimingPt

System (specimen)Semen

ScaleQn

ClassCHEM

Example unitsIU/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.42

Consumer names

Prostate specific antigen, Semen

Part names

Prostate specific AgACncPtSemenQnArbitrary ConcentrationPoint 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.