During the last years recent publication have been showing that the APC Resistance phenotype is a risk factor for venous thrombosis, irrespective of the FV Leiden mutation, and hence this illustrates that the Coatest® APC Resistance and the Coatest® APC Resistance V kits measure different entities. For this reason, both Coatest® APC Resistance and the Coatest® APC Resistance V kits are included in the thrombophilia screening panel in some important laboratories. A recent and interesting publication on inherited thrombophilia was done by Uri Seligsohn and Aharon Lubetsky. In this paper, both APCR and APCR V are suggested as part of six high priority tests. The diagnosis for factor V Leiden should be confirmed by genetic test, in order to decide whether the family members should be examined.