Table 1. The grading system for classifying the severity of envenoming.

		Grade
		I	II	III
Coagulation disorder*		+	+	+
Local signs	Pain	+	+	+
	Swelling	Not exceeding elbow or knee	Exceeding elbow or knee	Beyond the root of the limb
	Blister	-	+	+
	Necrosis	-	-	+
Local bleeding		-	+	+
Systemic bleeding		-	-	+
Systemic manifestations (Hypotension, Renal failure, Coma, Respiratory failure)		-	-	Organ failure

*Based on results of the 20-min whole blood clotting test and laboratory analysis.