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 28551-0: Bladder tumor Ag IA Qn (U)

Name: LOINC Code 28551-0: Bladder tumor Ag IA Qn (U)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:15.023Z

28551-0 is a LOINC code used to identify Bladder tumor Ag IA Qn (U) 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 Bladder tumor Ag. It is commonly used with the system or sample type Urine.

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 Bladder tumor Ag. It is commonly used with the system or sample type Urine.

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
Method: IA

What it does not mean

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

Key facts

Bladder tumor Ag [Units/volume] in Urine by Immunoassay
Bladder tumor Ag
Antigen; Antigens; Arbitrary concentration; BT; BTA; EIA; ELFA; ELISA; Enzyme immunoassay; IAA; MEIA; Point in time; QNT; Quan; Quant; Quantitative; Random; Serology; SUDS; Tumor marker; UA; UR; Urn

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

Bladder tumor Ag IA Qn (U)Bladder tumor Ag [Units/volume] in Urine by ImmunoassayBladder tumor Ag Ur IA-aCncBladder tumor AgSEROBladder tumor antigen, UrineACnc

Frequently asked questions

Code details

Code28551-0

SystemLOINC

Display nameBladder tumor Ag IA Qn (U)

DescriptionBladder tumor Ag

Short nameBladder tumor Ag Ur IA-aCnc

ComponentBladder tumor Ag

PropertyACnc

TimingPt

System (specimen)Urine

ScaleQn

MethodIA

ClassSERO

Example unitsarb U/mL

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.00

Last changed2.73

Consumer names

Bladder tumor antigen, Urine

Part names

Bladder tumor AgACncPtUrineQnIAArbitrary ConcentrationPoint in time (spot)Immunoassay

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.