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Activated protein C resistance - plasma

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Eurofins Biomnis code



  • Activated protein C resistance test
  • Dahlback test
  • RPCa
  • Dahlback factor

Clinic significance

Activated Protein C Resistance (APCR, also referred to as Factor V Leiden) is an important risk factor for familial thrombophilia. This phenomenon is found in 15 to 25% of subjects with a history of venous thromboembolism and in 2 to 7% of the population as a whole. In 90 to 95% of cases, this abnormality is associated with a specific mutation in the gene encoding Factor V (a Gln to Arg transition at position 1691 - Arg506Gln); the mutant Factor V (also referred to as Factor V Leiden) is resistant to inactivation by Protein C. There are currently two different modalities for diagnosing this condition. The first is a functional test based on detecting a prolonged Activated Partial Thromboplastin Time after addition of activated Protein C with Factor V-deficient plasma and a heparin inhibitor. The second is based on molecular genetic methods to detect the actual mutation in the subject's genome.


  • 2 mL
  • Citrated Plasma

Further information

  • It is advisable to send us a frozen and centrifuged citrate sample in compliance with the GFHT pre-analytical recommendations.
  • Please specify whether factor V Leiden should be performed if the activated protein C resistance test is positive (please ensure to enclose a consent form from the patient in accordance with the regulatory requirements, as well as 5 mL EDTA whole blood)
  • [To be translated]


Chronometric method

Turnaround time

2 days

Pathologist(s) in charge
Biomnis Paris
Dr Dominique ENGERAND
Dr Laurence GUIS
+331 49 59 17 44
+331 49 59 62 70
+331 49 59 15 01