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 99103-4: Tumor necrosis factor.alpha Qn

Name: LOINC Code 99103-4: Tumor necrosis factor.alpha Qn
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:33.064Z

99103-4 is a LOINC code used to identify Tumor necrosis factor.alpha 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 Tumor necrosis factor.alpha. It is commonly used with the system or sample type Ser/Plas.

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 Tumor necrosis factor.alpha. 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

Tumor necrosis factor.alpha [Units/volume] in Serum or Plasma
Tumor necrosis factor.alpha
Alfa; Arbitrary concentration; A-Tumor Necrosis Fact; Cachectin; Cachectine; Chemistry; Fac; Fact; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; TNF

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

Tumor necrosis factor.alpha QnTumor necrosis factor.alpha [Units/volume] in Serum or PlasmaA-Tumor Necrosis Fact SerPl-aCncTumor necrosis factor.alphaCHEMTumor necrosis factor.alpha, BloodACnc

Frequently asked questions

Code details

Code99103-4

SystemLOINC

Display nameTumor necrosis factor.alpha Qn

DescriptionTumor necrosis factor.alpha

Short nameA-Tumor Necrosis Fact SerPl-aCnc

ComponentTumor necrosis factor.alpha

PropertyACnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHEM

Example unitsarb U/mL

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.72

Last changed2.72

Consumer names

Tumor necrosis factor.alpha, Blood

Part names

Tumor necrosis factor.alphaACncPtSer/PlasQnArbitrary 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.