dRVVT/dRVVT W excess phospholipid (screen to confirm ratio) 50410-0
LOINC Code
| LOINC code | 50410-0 | ||||
|---|---|---|---|---|---|
| name | dRVVT/dRVVT W excess phospholipid (screen to confirm ratio) | ||||
| description | Dilute 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] | ||||
| status | ACTIVE | ||||
Fully-Specified Name | |||||
| component | Coagulation dilute Russell viper venom induced/Coagulation dilute Russell viper venom induced.excess phospholipid | ||||
| property | Ratio | ||||
| time | Pt = Point in time: To identify measures at a point in time. This is a synonym for “spot” or “random” as applied to urine measurements. | ||||
| system | PPP = Platelet poor plasma | ||||
| scale | Qn = 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 | Coag = 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 name | dRVVT screen to confirm ratio | ||||
Basic Attributes | |||||
| class | COAG | ||||
| type | 1 Laboratory | ||||
| order vs. observation | Both | ||||
| 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 | |||||
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History/Usage | |||||
| test rank | 2022 of 2000 most commonly performed tests by labs in USA | ||||
| first released | |||||
| last updated | 2.73 | ||||
| last change type | MIN - change to field other than name | ||||
Related Names | |||||
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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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