Coagulation Panel Calculator

A coagulation panel measures several different, largely independent parts of the clotting cascade, and this calculator classifies each one separately before combining all five into an overall bleeding-risk estimate. PT Status is the simplest of the five: it stays Normal for any Prothrombin Time up to 13.5 seconds and switches to Elevated the moment PT exceeds that cutoff, with no lower threshold at all -- raising PT past 13.5 seconds always pushes PT Status from Normal to Elevated across this calculator's full 5-60 second range, and it never reverses back to Normal at higher values. PT Status is computed purely from PT itself; Fibrinogen has no bearing on it, since PT and fibrinogen assess different parts of the clotting cascade and this calculator keeps their status classifications separate. The same independence holds throughout: INR Status depends only on INR, PTT Status only on PTT, and Platelet count only feeds the bleeding-risk score, not any of the three status fields. INR Status has five bands, not four: below 0.9 is Low, 0.9-1.1 is Normal, above 1.1 up to 2.0 is a distinct Mildly Elevated/Subtherapeutic band (which covers subtherapeutic warfarin dosing, early liver disease, and early DIC and is deliberately not folded into Normal), 2-3 is Therapeutic, and above 3 is High.

PTT Status likewise has a Short band (below 25 seconds) in addition to Normal and Elevated, since a short aPTT can be clinically relevant and is not the same result as a normal one. Bleeding Risk itself is a points system built from all five values -- more severe deviations in PT, INR, PTT, low fibrinogen, and low platelet count each add points, and points accumulate across parameters rather than any single abnormal value alone driving the risk category. A platelet count below the standard prophylactic-transfusion threshold of 20 x10^3/uL adds enough points on its own to reach the High bleeding-risk tier, even when every other value on the panel is normal, since a critically low platelet count is itself a significant spontaneous-bleeding risk. Because INR and PT largely track the same clotting pathway, both are shown together, and a patient on stable warfarin therapy will typically show a therapeutic INR (2-3) alongside a correspondingly elevated PT -- discordance between the two is itself often clinically notable. INR here is treated as a lab-reported value, not derived from PT and an ISI (International Sensitivity Index) within this calculator -- there is no ISI input and no PT-to-INR conversion performed.