LOINCActiveObservation

LOINC Code 38521-1: Coagulation factor VIII Ag actual/normal IA (PPP) [Relative mass conc]

38521-1 is a LOINC code used to identify Coagulation factor VIII Ag actual/normal IA (PPP) [Relative mass conc] 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 Coagulation factor VIII Ag actual/Normal. 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 Coagulation factor VIII Ag actual/Normal. 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: Observation
  • Method: IA

What it does not mean

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

Key facts

Coagulation factor VIII Ag actual/normal in Platelet poor plasma by Immunoassay
Coagulation factor VIII Ag actual/Normal
Act/Nor; Ag Act/Nor; AHF; AHG; Antigen; Antigens; Antihemophilic factor; Antihemophilic globulin; Circulating anticoagulant; Coag; Control; EIA; ELFA; ELISA; Enzyme immunoassay; F8; Fac; Fact; Fact VIII; Factor 8; Factor VIII clotting activity; FVIII; Hematology; Heme; IAA; MEIA; Plas; Platelet poor plasma; Point in time; QNT; Quan; Quant; Quantitative; Random; Relative mass concentration; RLMCNC; SUDS; Thrombocyte cofactor A; VIIIC

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

Coagulation factor VIII Ag actual/normal IA (PPP) [Relative mass conc]Coagulation factor VIII Ag actual/normal in Platelet poor plasma by ImmunoassayFact VIII Ag Act/Nor PPP IACoagulation factor VIII Ag actual/NormalCOAGCoagulation Factor VIII antigen activity, BloodRelMCnc

Frequently asked questions

Code details

Code38521-1
SystemLOINC
Display nameCoagulation factor VIII Ag actual/normal IA (PPP) [Relative mass conc]
DescriptionCoagulation factor VIII Ag actual/Normal
Short nameFact VIII Ag Act/Nor PPP IA
ComponentCoagulation factor VIII Ag actual/Normal
PropertyRelMCnc
TimingPt
System (specimen)PPP
ScaleQn
MethodIA
ClassCOAG
Example units%
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.14
Last changed2.73

Consumer names

Coagulation Factor VIII antigen activity, Blood

Part names

Coagulation factor VIII Ag actual/NormalRelMCncPtPPPQnIARelative Mass 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 38521-1 | HealthAssure