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4.5 mL blood added to 0.5 mL citrate.
Recalcification of platelet-poor plasma at 37°C in presence of Stypven (Russell viper venom) and phospholipid.
| Reference Interval|
Investigation of possible bleeding disorder.
Stypven activates factor X directly, thus the Stypven time is normal in factor VII deficiency, but abnormal in factor V, II and most cases of factor X deficiency.
Dacie JV and Lewis SM. Practical Haematology. 8th ed. Churchill Livingstone 1995.