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 90919-2: Bound rFVIII/vWf Ag IA (P) [Relative ratio]

Name: LOINC Code 90919-2: Bound rFVIII/vWf Ag IA (P) [Relative ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:20.875Z

90919-2 is a LOINC code used to identify Bound rFVIII/vWf Ag IA (P) [Relative ratio] 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.recombinant.bound/von Willebrand factor Ag. It is commonly used with the system or sample type 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 Coagulation factor VIII.recombinant.bound/von Willebrand factor Ag. It is commonly used with the system or sample type 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
Method: IA

What it does not mean

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

Key facts

Coagulation factor VIII.recombinant.bound/von Willebrand factor (vWf) Ag in Plasma by Immunoassay

Coagulation factor VIII.recombinant.bound/von Willebrand factor Ag

This test measures the binding activity of von Willebrand factor (vWF) to Factor VIII as the ratio of the amount of exogenous recombinant Factor VIII bound to vWF in the patient sample to the amount of vWF in the patient sample. It is used to differentiate between various bleeding disorders including hemophilia A and type 2N von Willebrand disease (2N vWD, VWD2N, or Type 2 Normandy). Type 2N vWD is caused by mutations to the Factor VIII binding site of vWF, which results in reduced binding and faster clearance of Factor VIII. Patients with type 2N vWD usually have reduced Factor VIII activity with normal VWF levels. [PMID19298374]

AHF; AHG; Antihemophilic factor; Antihemophilic globulin; Associated; bnd; Circulating anticoagulant; Coag; EIA; ELFA; ELISA; Enzyme immunoassay; F8; Fac; Fact; Fact VIII; Fact VIII.recomb.bound; Factor 8; Factor VIII clotting activity; FVIII; Hematology; Heme; IAA; MEIA; Normandy; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; Relative ratio; SUDS; Thrombocyte cofactor A; Type 2 Normandy; VIIIC; Von will; Vonwillebrand; vWf; vWF:Ag

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

Bound rFVIII/vWf Ag IA (P) [Relative ratio]Coagulation factor VIII.recombinant.bound/von Willebrand factor (vWf) Ag in Plasma by ImmunoassayFact VIII.recomb.bound/vWF Ag Plas IACoagulation factor VIII.recombinant.bound/von Willebrand factor AgCOAGBound Recombinant Factor VIII/vWF Antigen, BloodRelRto

Frequently asked questions

Code details

Code90919-2

SystemLOINC

Display nameBound rFVIII/vWf Ag IA (P) [Relative ratio]

DescriptionCoagulation factor VIII.recombinant.bound/von Willebrand factor Ag

Short nameFact VIII.recomb.bound/vWF Ag Plas IA

ComponentCoagulation factor VIII.recombinant.bound/von Willebrand factor Ag

PropertyRelRto

TimingPt

System (specimen)Plas

ScaleQn

MethodIA

ClassCOAG

Example unitsratio

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.65

Last changed2.68

Consumer names

Bound Recombinant Factor VIII/vWF Antigen, Blood

Part names

Coagulation factor VIII.recombinant.bound/von Willebrand factor AgRelRtoPtPlasQnIARelative RatioPoint in time (spot)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.