Eurofins Biomnis code

PSAG

Synonyms

• Total protein S Antigen
• Total protein S antigen
• Total PS Ag

Specialty

Haematology

Clinical significance

Protein S (PS) acts as a cofactor of Protein C to accelerate inactivation of the activated forms of Factors V and VIII. It is a vitamin K-dependent protein synthesized in the liver which circulates in either a free, functional form (40%) or in an inactive form bound to C4 binding protein (60%). The main purpose of this test is to detect congenital deficiency. Congenital PS deficiency is an autosomal dominant trait and both qualitative and quantitative deficiency is associated with recurrent venous thrombosis. Acquired PS deficiency (i.e. a loss of activity) is associated with liver disease, diabetes and inflammation (which entails elevated levels of C4 binding protein) or it can be induced by vitamin K antagonists and other drugs (L-asparaginase and oral contraceptives). This test should not be performed within one month of an episode of thrombosis or vitamin K antagonist treatment.This test is used to confirm or investigate PS deficiency.

Preanalytics

• 1 mL :
• Citrated Plasma
•   FROZEN
• Freezing within 4 hours

• A tube specifically for this analysis : Yes

Further information

Enclose the specific clinical information form (R5-INTGB : Haemostasis)
1 individual aliquot for this analysis.
It is advisable to send us a frozen and centrifuged citrate sample in compliance with the GFHT pre-analytical recommendations.

Documents to download

• Specific clinical information form (R5-INTGB)

Methodology

Enzyme-immunoassay

Turnaround time

2 weeks