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 12841-3: Free PSA/Total PSA [Mass fraction]

Name: LOINC Code 12841-3: Free PSA/Total PSA [Mass fraction]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

12841-3 is a LOINC code used to identify Free PSA/Total PSA [Mass fraction] 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/Prostate specific Ag.total. 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/Prostate specific Ag.total. 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: Observation

What it does not mean

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

Key facts

Prostate Specific Ag Free/Prostate specific Ag.total in Serum or Plasma
Prostate specific Ag.free/Prostate specific Ag.total
Chemistry; fPSA; FR; Genitourinary; GU; Kallikrein 3; Mass fraction; Non-protein bound; Oncology; P-30 antigen; Percent; 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; Tot; Totl; 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 Free PSA/Total PSA [Mass fraction] (12841-3)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Free PSA/Total PSA [Mass fraction]Prostate Specific Ag Free/Prostate specific Ag.total in Serum or PlasmaPSA Free MFr SerPlProstate specific Ag.free/Prostate specific Ag.totalCHEMFree PSA/Total Prostate Specific Antigen (Total PSA), BloodMFr

Frequently asked questions

Code details

Code12841-3

SystemLOINC

Display nameFree PSA/Total PSA [Mass fraction]

DescriptionProstate specific Ag.free/Prostate specific Ag.total

Short namePSA Free MFr SerPl

ComponentProstate specific Ag.free/Prostate specific Ag.total

PropertyMFr

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHEM

Example units%

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0j-a

Last changed2.73

Consumer names

Free PSA/Total Prostate Specific Antigen (Total PSA), Blood

Part names

Prostate specific Ag.free/Prostate specific Ag.totalMFrPtSer/PlasQnMass fractionPoint 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.