🧪 Coagulation Tests

Tests that evaluate the blood's ability to clot properly.

Prothrombin Time (PT / INR)(PT / INR)

Prothrombin time measures how long blood takes to form a clot via the extrinsic coagulation pathway. The INR standardises PT results across laboratories and is essential for monitoring warfarin therapy.

Venous blood (citrate tube — must be filled exactly to the line)

D-Dimer(D-Dimer)

D-dimer is a fibrin degradation product released when a blood clot dissolves. It is primarily used as a rule-out test for deep vein thrombosis (DVT) and pulmonary embolism (PE) — a low result in a low-risk patient effectively excludes these diagnoses.

Venous blood (citrate or serum — lab dependent)

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