Version 2.80

Term Description

Von Willebrand Factor Activity (VWF Activity, vWF:Act) in plasma specimens can be quantitatively determined by immunological methods. This code is created for, but not limited in use to, the submitter's kit, HemosIL Von Willebrand Factor Activity Kit, which determines VWF activity by measuring the increase of turbidity produced by the agglutination of the latex reagent. This assay uses a specific anti-VWF monoclonal antibody directed against the platelet binding site of VWF, glycoprotein Ib receptor, and reacts with the VWF in patient plasma. The degree of agglutination is directly proportional to the activity of VWF in the sample and is determined by measuring the decrease of transmitted light caused by the aggregates. The submitter's lab reports the results in U/mL where U represents "units" rather than the standard meaning of U, which is mmol/Min, a measure of enzyme rates. Additional testing (e.g. ristocetin cofactor assay) may be needed to confirm a diagnosis of von Willebrand disease (VWD).

Fully-Specified Name

Component
von Willebrand factor.activity
Property
ACnc
Time
Pt
System
PPP
Scale
Qn
Method
IA

Additional Names

Long Common Name
von Willebrand factor (vWf).activity [Units/volume] in Platelet poor plasma by Immunoassay
Short Name
vWf:Ac PPP IA-aCnc
Display Name
vWf.activity IA Qn (PPP)
Consumer Name Alpha Get Info
vWf.activity, Blood

Basic Attributes

Class
COAG
Type
Laboratory
First Released
Version 2.44
Last Updated
Version 2.73 (MIN)
Change Reason
Renamed Method from "Imm" to "IA" for consistency across classes (approved by Laboratory LOINC Committee 2016 12).
Order vs. Observation
Both
Common Test Rank Get Info
8787

Language Variants Get Info

Tag Language Translation
de-DE German (Germany) von Willebrand-Faktor.Aktivität:Arbiträre Konzentration:Zeitpunkt:Thrombozytenarmes Plasma:Quantitativ:Immunoassay
el-GR Greek (Greece) παράγοντας Von Willebrand.δραστηριότητα:ACnc:Pt:PPP:Qn:IA
Synonyms: ACnc Δραστηριότητα παράγοντας Von Willebrand παράγοντας Von Willebrand.δραστηριότητα
es-ES Spanish (Spain) Factor von Willebrand .actividad:Concentración arbitraria:Punto temporal:Plasma pobre en plaquetas:Qn:IA
Synonyms: Cuantitativo
es-MX Spanish (Mexico) Factor de von Willebrand.:Concentración arbitraria:Punto temporal:Plasma pobre en plaquetas:Cuantitativo:Inmunoensayo
fr-CA French (Canada) Facteur von Willebrand.activité:Concentration arbitraire:Temps ponctuel:Plasma pauvre en plaquettes:Quantitatif:IA
fr-FR French (France) Facteur Willebrand activité:Arbitraire/Volume:Ponctuel:Plasma pauvre en plaquettes:Numérique:Immunoanalyse
it-IT Italian (Italy) Fattore di von Willebrand.attività:ACnc:Pt:PPP:Qn:IA
Synonyms: Concentrazione Arbitraria Fattore di von Willebrand (vWf) Fattore di von Willebrand (vWf).attività Immunoassay Plasma povero di piastrine Punto nel tempo (episodio) Studio di coagulazione
nl-NL Dutch (Netherlands) von Willebrand-factor.activiteit:eenheid/volume:moment:plaatjesarm plasma:kwantitatief:immunoassay
Synonyms: coagulatiemethode IA
pt-BR Portuguese (Brazil) Fator von Willebrand atividade::Pt:PPPQ:Qn:Imunológico
ru-RU Russian (Russian Federation) von Willebrand фактор.активность:ПроизвКонц:ТчкВрм:ОПП:Колич:IA
Synonyms: Количественный Обеднённая пластинками плазма;Бедная тромбоцитами плазма Произвольная концентрация Точка во времени;Момент
tr-TR Turkish (Turkey) von Willebrand faktörü.aktivite:SçKons:Zmlı:TFkP:Kant:İA
Synonyms: İmmünölçüm, immünoassay
zh-CN Chinese (China) von Willebrand 因子.活性:任意型浓度:时间点:贫血小板血浆:定量型:免疫测定法
Synonyms: von Willebrand von Willebrand 因子（von Willebrand Factor，vWf）;vWf;vWf 因子;血管性假血友病因子;血管性血友病因子 von Willebrand 因子（vWf 因子、血管性假血友病因子、血管性血友病因子）.活性;von Willebrand 因子（von Willebrand Factor，vWf）活性;vWf 活性;vWf 因子活性;血管性假血友病因子.活性;血管性血友病因子.活性 乏血小板血浆;Platelet poor plasma;PPP 任意型浓度(单位体积);任意浓度;单位体积的任意单位数;人工型浓度 免疫测定;免疫分析法;免疫检定法;免疫检定;免疫试验;酶免疫测定法;酶免疫测定;酶免疫分析法;酶免疫检定法;酶免疫检定;酶免疫试验 冯·威勒布兰德 冯威勒布兰德 冯威勒布兰德氏 凝血功能;凝血功能试验;凝血过程;血液凝固;血液凝固功能;血液凝固过程 可用数量表示的;定量性;数值型;数量型;连续数值型标尺 因素 时刻;随机;随意;瞬间 活动 系数

Example Units

Unit Source
[arb'U]/mL Example UCUM Units

LOINC Terminology Service (API) using HL7® FHIR® Get Info

CodeSystem lookup
https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=73978-9