Rox Prothrombin

For quantitative determination of Prothrombin (FII) functional activity in plasma and FII containing concentrates. The method is suitable for plasma collected in citrate or EDTA.

Factor II is a single chain vitamin K dependent glycoprotein of 72 kDa, which is activated to thrombin (FIIa) by FXa in the presence of FVa, calcium ions and phospholipids.

Key characteristics

• A chromogenic Prothrombin method based upon the prothrombinase complex.
• non-γ-carboxylated-FII is not activated in the method in contrast to snake venom-based prothrombin methods.
• Detection Limit 0.05 U/mL (5%) when using a plasma dilution of 1:200 as prescribed in the package insert.
• Suitable for analysis of plasma samples, plasma derived prothrombin containing concentrates and recombinant prothrombin*.

* Lövgren A,  Deinum J, Rosén S, Bryngelhed P, Rosén P, Hansson, K M. Characterization of thrombin derived from human recombinant prothrombin. Blood Coagulation & Fibrinolysis 2015; 26(5): 545-555.

Measurement principle

FII functional activity is determined in a chromogenic prothrombinase method, in which human FII is activated to thrombin (FIIa) by human FXa in the presence of bovine FV, calcium ions and phospholipid. The amount of FIIa formed is determined from the hydrolysis of a chromogenic FIIa substrate. The FII activity of the sample is assigned vs. plasma or a FII concentrate standard with FII potency expressed in International Units (IU).

The prothrombinase complex is sensitive to γ -carboxylation and therefore non-γ-carboxylated-FII is not activated in this method in contrast to snake venom based prothrombin methods.

Kit information

• 1 Kit = 4 x 25 test
• For In Vitro Research Use Only