| Test | Conventional | SI | Critical |
|---|---|---|---|
| Activated Partial Thromboplastin Time (aPTT) | 25–35 seconds | 25–35 seconds | > 70 seconds (bleeding risk) |
| Bleeding Time | 2–7 minutes | 2–7 minutes | — |
| D-Dimer | < 0.5 (negative) µg/mL FEU | < 0.5 mg/L FEU | — |
| Fibrinogen | 200–400 mg/dL | 2–4 g/L | < 100 mg/dL (bleeding risk) |
| International Normalized Ratio (INR) | 0.8–1.1 (off anticoagulation) ratio | 0.8–1.1 ratio | > 5.0 (high spontaneous bleeding risk) |
| Prothrombin Time (PT) | 11–13.5 seconds | 11–13.5 seconds | > 30 seconds (marked bleeding risk) |
| Thrombin Time | 14–19 seconds | 14–19 seconds | — |
Panel
Coagulation Studies
PT/INR, aPTT, fibrinogen, and D-dimer for bleeding and clotting. 7 tests, 4 with a critical value.
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