What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveBoth

LOINC Code 50410-0: dRVVT screen to confirm Coag (PPP) [Ratio]

Name: LOINC Code 50410-0: dRVVT screen to confirm Coag (PPP) [Ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:34.496Z

50410-0 is a LOINC code used to identify dRVVT screen to confirm Coag (PPP) [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 Coagulation dilute Russell viper venom induced/Coagulation dilute Russell viper venom induced.excess phospholipid. It is commonly used with the system or sample type PPP.

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 Coagulation dilute Russell viper venom induced/Coagulation dilute Russell viper venom induced.excess phospholipid. It is commonly used with the system or sample type PPP.

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: Both
Method: Coag

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

dRVVT/dRVVT W excess phospholipid (screen to confirm ratio)

Coagulation dilute Russell viper venom induced/Coagulation dilute Russell viper venom induced.excess phospholipid

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. [PMID19624461]

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

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

dRVVT screen to confirm Coag (PPP) [Ratio]dRVVT/dRVVT W excess phospholipid (screen to confirm ratio)dRVVT screen to confirm ratioCoagulation dilute Russell viper venom induced/Coagulation dilute Russell viper venom induced.excess phospholipidCOAGdRVVT screen to confirm ratio, BloodRatio

Frequently asked questions

Code details

Code50410-0

SystemLOINC

Display namedRVVT screen to confirm Coag (PPP) [Ratio]

DescriptionCoagulation dilute Russell viper venom induced/Coagulation dilute Russell viper venom induced.excess phospholipid

Short namedRVVT screen to confirm ratio

ComponentCoagulation dilute Russell viper venom induced/Coagulation dilute Russell viper venom induced.excess phospholipid

PropertyRatio

TimingPt

System (specimen)PPP

ScaleQn

MethodCoag

ClassCOAG

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.22

Last changed2.73

Consumer names

dRVVT screen to confirm ratio, Blood

Part names

Coagulation dilute Russell viper venom induced/Coagulation dilute Russell viper venom induced.excess phospholipidRatioPtPPPQnCoagdRVVT/dRVVT.excess phospholipidPoint in time (spot)Platelet poor plasmaCoagulation assay

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.