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 19201-3: Free PSA Qn

Name: LOINC Code 19201-3: Free PSA Qn
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

19201-3 is a LOINC code used to identify Free PSA Qn 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.free. It is commonly used with the system or sample type Ser/Plas.

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.free. It is commonly used with the system or sample type Ser/Plas.

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 Free [Units/volume] in Serum or Plasma
Prostate specific Ag.free
Arbitrary concentration; Chemistry; fPSA; FR; Kallikrein 3; Non-protein bound; P-30 antigen; Pl; Plasma; Plsm; Point in time; PS; PSA; PSA Free; QNT; Quan; Quant; Quantitative; Random; Seminin; SerP; SerPl; SerPlas; Serum; Serum or plasma; Spec; SR; Tumor marker; UniversalLabOrders

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 Free PSA Qn (19201-3)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Free PSA QnProstate Specific Ag Free [Units/volume] in Serum or PlasmaPSA Free SerPl-aCncProstate specific Ag.freeCHEMFree PSA, BloodACnc

Frequently asked questions

Code details

Code19201-3

SystemLOINC

Display nameFree PSA Qn

DescriptionProstate specific Ag.free

Short namePSA Free SerPl-aCnc

ComponentProstate specific Ag.free

PropertyACnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHEM

Example unitsIU/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.73

Consumer names

Free PSA, Blood

Part names

Prostate specific Ag.freeACncPtSer/PlasQnProstate Specific Ag FreeArbitrary ConcentrationPoint in time (spot)Serum or Plasma

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.