Sodium Citrate 1.8 mL Paed (Clear/Pale Blue Inner)
Sodium Citrate 1.0 mL Neonate (Pale Blue Top)
Accurate filling of specimen tube essential. Specimens must be transported at room temperature to the Laboratory in a red specimen bag ASAP. (Maximum delay to testing laboratory must not exceed 2hrs) * If several factor assays are requested e.g. II, V,VII and X, a total of 3 x sodium citrate tubes are required for an adult and 2 tubes for a child.
Prothrombin has a biological half-life of 3 days. Fewer than 100 cases of prothrombin deficiency have been described. Acquired F II deficiency may be due to liver disease and Vit K deficiency/antagonism. Antibodies against F II can be seen in patients with the lupus anticoagulant or the antiphospholipid syndrome and on rare occasions as isolated cases.