Snake venom detection (CSL Kit) on bite site (or urine if there is systemic envenoming).
Coagulation studies. Prothrombin time/INR and APTT and if these are prolonged do fibrinogen, fibrin(ogen) degradation products and possibly TCT (Thrombin Clotting Time).
Complete blood picture (platelet count).
Plasma/serum electrolytes and renal function (especially K+, creatinine and urea).
Urine (ward test=dipstix looking for blood=?myoglobin or ? true haematuria - microscopy required to look for red cells).
All tests should be performed on first presentation and at intervals thereafter, the frequency depending on the results and the patient's condition.