Table Severity-of-Illness Score for Toxic Epidermal Necrolysis (SCORTEN) Risk Factor * Score 0 1 Age < 40 years ≥ 40 years Associated cancer No Yes Heart rate (beats / minute) < 120 ≥ 120 Serum blood urea nitrogen ≤ 28 mg / dL (10 mmol / L) > 28 mg / dL (10 mmol / L) Detached or compromised body surface < 10% ≥ 10% Serum bicarbonate ≥ 20 mEq / L (≥ 20 mmol / L) < 20 mEq / L (< 20 mmol / L) Serum glucose ≤ 250 mg / dL (≤ 13.88 mmol / L) > 250 mg / dL (> 13.88 mmol / L) * More risk factors indicate a higher score and a higher mortality rate (%) as follows: 0 - 1 = 3.2% (CI: 0.1 to 16.7) 2 = 12.1% (CI: 5.4 to 22.5) 3 = 35.3% (CI: 19.8 to 53.5) 4 = 58.3% (CI: 36.6 to 77.9) ≥ 5 = > 90% (CI: 55.5 to 99.8) CI = confidence interval.