dRVVT/dRVVT W excess phospholipid (screen to confirm ratio)   50410-0

LOINC Code


LOINC code50410-0
namedRVVT/dRVVT W excess phospholipid (screen to confirm ratio)
descriptionDilute Russell Viper Venom Time Confirmation reported as a Ratio as part of the Lupus Anticoagulant Panel. In the confirmatory assay, a second dRVVT is performed using a reagent with additional phospholipids capable of neutralizing the LA. A ratio of the clotting times is calculated from the dRVVT screening test divided by the dRVVT confirmatory test. If a LA is present, the dRVVT confirmatory test will correct to normal. The dRVVT confirmatory reagent also contains a neutralizing agent for heparin in concentrations up to 1 unit/mL. Although patients on Coumadin or patients with deficiencies of factor II, V, and X may show prolonged times, the final ratio will be normal unless a LA is present. The dRVVT confirmatory assay should be run only if the dRVVT screening assay is elevated above the normal reference interval. In thei case, the confirmatory test is done and a ratio is calculated. If the ratio is greater than the upper limit of the established normal reference interval, the LA is present. If the ratio is less than or equal to the upper limit, the LA is absent. The dRVVT screen to confirm ratio formula is based on the 2009 International Society on Thrombosis and Haemostasis lupus anticoagulant testing guidelines. [PMID:19624461]
statusACTIVE

Fully-Specified Name

componentCoagulation dilute Russell viper venom induced/Coagulation dilute Russell viper venom induced.excess phospholipid
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
methodCoag  =  Coagulation Assay:  To distinguish coagulation assays based on clotting methods that test function/activity from Immune methods that detect the presence of clotting factors and may or may not be functional assays.

Additional Names

short namedRVVT screen to confirm ratio

Basic Attributes

classCOAG
type1  Laboratory
order vs. observationBoth
formula (readable)Screen dRVVT/Confirm dRVVT
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)

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.

Member of these Panels

75515-7Lupus anticoagulant aPTT and dRVVT screening panel W Reflex
75881-3Lupus anticoagulant aPTT, dRVVT and PT screening panel W Reflex

History/Usage

test rank2022 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

Clot
Clottable
Coag
Coagulation assay
Coagulation dilute Russell viper venom induced confirmatory test
Dil
Dil Russell Vip Ven
Dilut
dRVV
dRVVT
dRVVT cfm
dRVVT confirm
dRVVT confirmation test
dRVVT/dRVVT cfm
EXS
Hematology
Heme
Lipid
Phoslpd
Phospholipids
Pl
Plas
Platelet poor plasma
Point in time
QNT
Quan
Quant
Quantitative
Random
Ratios
Rto
Rus
RVV
Screening test for lupus anticoagulant
Tilt tube

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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