Notification of anticoagulant therapy is essential

One (1x) Sodium citrate tubes is required. Do not use 1 ml citrate tubes.

Filled to label marker and mixed by inversion

The patient must not be receiving heparin

Unspun sample is stable for up to 4 hours and must be transport to laboratory immediately. (Sample must be double spun, aliquoted and frozen within 4 hours from time of collection).

Tests performed:

INR, APTT, APTT Mix, Silica Clotting Time and Dilute Russell's Viper venom time (LA screen/Confirm).

LA screen   <1.2 Lupus anticoagulant not detected.

LA Confirm <1.2 Lupus anticoagulant not detected

                    1.2 - 1.5 L.A. weakly present

                    1.5 - 2.0 L.A. moderately present.

                     >2.0      L.A. strongly present