Investigation for acute abdomen includes

.Gram -ve septicaemia is common in acute abdomen like peritonitis, abscess, urinary infections, biliary infections, postoperative sepsis. It is commonly seen in malnutrition, old age, diabetics, immunosuppressed people. Diabetic acute abdomen -Patient with diabetes mellitus may present as acute abdomen. Free fluid in the flank may not be present. Patient may be ketotic also.the investigation of choice in a case of acute abdomen is ultrasound. ref:SRB&;s manual of surgery,ed 3,pg no 502