LOINCActiveBoth

LOINC Code 3177-3: Antithrombin Ag IA (PPP) [Moles/Vol]

3177-3 is a LOINC code used to identify Antithrombin Ag IA (PPP) [Moles/Vol] 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 Antithrombin Ag. It is commonly used with the system or sample type PPP.

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 Antithrombin Ag. It is commonly used with the system or sample type PPP.

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

  • Antithrombin Ag [Moles/volume] in Platelet poor plasma by Immunoassay
  • Antithrombin Ag
  • Anti thrombin; Antigen; Antigens; Antithrm; Antithrombin III; Antithrombn; AT; AT III; ATIII; COAGULATION; EIA; ELFA; ELISA; Enzyme immunoassay; Hematology; Heme; Heparin cofactor I; IAA; Level; MEIA; Plas; Platelet poor plasma; Point in time; QNT; Quan; Quant; Quantitative; Random; Substance concentration; SUDS; Thrombin inhibitor I

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

Antithrombin Ag IA (PPP) [Moles/Vol]Antithrombin Ag [Moles/volume] in Platelet poor plasma by ImmunoassayAT III Ag PPP IA-sCncAntithrombin AgCOAGAntithrombin antigen, BloodSCnc

Frequently asked questions

Code details

Code3177-3
SystemLOINC
Display nameAntithrombin Ag IA (PPP) [Moles/Vol]
DescriptionAntithrombin Ag
Short nameAT III Ag PPP IA-sCnc
ComponentAntithrombin Ag
PropertySCnc
TimingPt
System (specimen)PPP
ScaleQn
MethodIA
ClassCOAG
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0
Last changed2.73

Consumer names

Antithrombin antigen, Blood

Part names

Antithrombin AgSCncPtPPPQnIASubstance ConcentrationPoint in time (spot)Platelet poor plasmaImmunoassay

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.

LOINC Code 3177-3 | HealthAssure