von Willebrand factor (vWf) ristocetin cofactor/von Willebrand factor (vWf) Ag [Ratio] in Platelet poor plasma   81643-9

LOINC Code


LOINC code81643-9
namevon Willebrand factor (vWf) ristocetin cofactor/von Willebrand factor (vWf) Ag [Ratio] in Platelet poor plasma
descriptionThis term represents a ratio of two results that are expressed as percentages of normal: the von Willebrand factor.ristocetin cofactor activity and the von Willebrand factor antigen concentration, both of which are reported as actual/Normal. The von Willebrand factor (vWF) ristocetin cofactor activity to antigen ratio can help distinguish different types of von Willebrand disease (VWD). VWD types 1 and 3 are usually associated with a quantitative decrease in vWF, which would affect both the vWF ristocetin cofactor activity as well as vWF antigen concentration, while type 2 is associated with a functional defect in VWF, which would affect the activity but not the amount of antigen present. Therefore, patients with type 2 VWD are likely to have a lower vWF ristocetin cofactor activity to antigen ratio (less than 0.6-0.7) compared to patients with types 1 or 3 VWD.
statusACTIVE

Fully-Specified Name

componentvon Willebrand factor.ristocetin cofactor activity/von Willebrand factor Ag
propertyRatio
timePt  =  Point in time:  To identify measures at a point in time. This is a synonym for “spot” or “random” as applied to urine measurements.
systemPPP  =  Platelet poor plasma
scaleQn  =  Quantitative:  The result of the test is a numeric value that relates to a continuous numeric scale. Reported either as an integer, a ratio, a real number, or a range. The test result value may optionally contain a relational operator from the set {<=, <, >, >=}. Valid values for a quantitative test are of the form "7", "-7", "7.4", "-7.4", "7.8912", "0.125", "<10", "<10.15", ">12000", 1-10, 1:256
method

Additional Names

short namevWf:RCo/vWF Ag PPP-Rto

Basic Attributes

classCOAG
type1  Laboratory
order vs. observationBoth
formula (readable)(vWF ristocetin cofactor activity actual/Normal)/(vWF Ag actual/Normal)
example UCUM units{ratio}
The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business (www.unitsofmeasure.org)
example unitratio

Associated Observations

LOINC codes that represent optional associated observation(s) for a clinical observation or laboratory test. A LOINC term may represent a single associated observation or panel containing several associated observations.

History/Usage

test rank3139 of 2000 most commonly performed tests by labs in USA
first released
last updated2.73
last change typeMIN  - change to field other than name

Related Names

Activ
Actvty
AggRecetin
COAGULATION
Cofact
Fac
Fact
Hematology
Heme
Movements
Plas
Platelet poor plasma
Point in time
QNT
Quan
Quant
Quantitative
Random
Ratios
Risto
Rto
Von will
Von willebrand factor activity
Vonwillebrand
vWf
vWf Activity
vWF:Ag
vWf:RCo

Copyright © 2024 Regenstrief Institute, Inc. All Rights Reserved. To the extent included herein, the LOINC table and LOINC codes are copyright © 1995-2024, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. See https://loinc.org/license for the full LOINC copyright and license.

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