Increased 'anion gap' is not seen in-
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
Salicylate poisoning
Renal tubular acidosis
Lactic acidosis
Ethylene glycol poisoning
Fluid and electrolytes