Increased 'anion gap' is not seen in-
Salicylate poisoning
Renal tubular acidosis
Lactic acidosis
Ethylene glycol poisoning
The most common causes of high anion gap metabolic acidosis are: ketoacidosis, lactic acidosis, renal failure, and toxic ingestions. Ketoacidosis can occur as a complication of type I diabetes mellitus (diabetic ketoacidosis), but can occur due to other disorders, such as chronic alcoholism and undernutrition. Ref Davidson 23rd edition pg 364
Fluid and electrolytes