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LOINC Code 74809-5: vWf.activity actual/normal IA (PPP control) [Relative ratio]

74809-5 is a LOINC code used to identify vWf.activity actual/normal IA (PPP control) [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 von Willebrand factor.activity actual/Normal. It is commonly used with the system or sample type PPP^Control.

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 von Willebrand factor.activity actual/Normal. It is commonly used with the system or sample type PPP^Control.

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

von Willebrand factor (vWf).activity actual/normal in Control Platelet poor plasma by Immunoassay
von Willebrand factor.activity actual/Normal
Mixing studies are performed using patient plasma and normal control plasma to determine the cause of decreased von Willebrand Factor (vWF) activity levels. In order to appropriately evaluate the results of the mixing studies, it is necessary to perform a vWF activity level on the normal control plasma. This code is created for, but not limited in use to, the submitter's BCS test kit.
Act/Nor; Activ; Actvty; COAGULATION; Contrl; Control; EIA; ELFA; ELISA; Enzyme immunoassay; Fac; Fact; Hematology; Heme; IAA; MEIA; Movements; Normal; Plas; Platelet poor plasma; Point in time; QNT; Quan; Quant; Quantitative; Random; Relative ratio; SUDS; Von will; Vonwillebrand; vWf; vWfAc

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

vWf.activity actual/normal IA (PPP control) [Relative ratio]von Willebrand factor (vWf).activity actual/normal in Control Platelet poor plasma by ImmunoassayvWf:Ac Act/Nor PPP Cont IAvon Willebrand factor.activity actual/NormalCOAGvWf.activity actual/normal, control BloodRelRto

Frequently asked questions

Code details

Code74809-5
SystemLOINC
Display namevWf.activity actual/normal IA (PPP control) [Relative ratio]
Descriptionvon Willebrand factor.activity actual/Normal
Short namevWf:Ac Act/Nor PPP Cont IA
Componentvon Willebrand factor.activity actual/Normal
PropertyRelRto
TimingPt
System (specimen)PPP^Control
ScaleQn
MethodIA
ClassCOAG
Example units%
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.48
Last changed2.73

Consumer names

vWf.activity actual/normal, control Blood

Part names

von Willebrand factor.activity actual/NormalRelRtoPtPPP^controlQnIARelative RatioPoint in time (spot)Platelet poor plasma^ControlImmunoassay

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 74809-5 | HealthAssure