Coagulation is its own department. The sample for these tests is citrate plasma, the blue-top tube, not the EDTA tube used for CBC.
PT with INR
Opening price ₹250. Four rows: prothrombin time, control PT, INR and ISI. Patient PT opens at 11–16 seconds. Control opens at 11–14. INR opens at 0.8–1.2, and the range text says a therapeutic range varies. ISI opens at 0.9–1.5 with the words “as per reagent”. If the laboratory’s thromboplastin has a different ISI, type that ISI. The program does not look up the reagent bottle.
Someone on a blood thinner can have an INR above 1.2 on purpose. The flag only means the number is outside the stored band. Staff who release the report decide what to do with that mark. The band can be edited if the laboratory wants the routine range to match its own control.
The other three
aPTT opens at ₹300, with a patient time and a control. The patient band opens at 25–35 seconds. D-dimer opens at ₹1,200, cut-off text under 500 ng/mL FEU, and the text says the cut-off depends on the laboratory. Fibrinogen opens at ₹600, by the Clauss method, band 200–400 mg/dL.