Normal anion gap is seen in:

Ans. (d) Renal tubular acidosis* Anion gap :The anion gap is the difference between primary measured cations (sodium Na+ and potassium K+) and the primary measured anions (chloride Cl and bicarbonate HCO3) in serum.* So we take value of sodium and from it subtract the value of chloride and bicarbonate.* Value of Normal anion gap =10 to 12 mmol/LAG calculated as follows: AG = Na+ - (Cl" + HCO3~)Normal anion gap(Mn: FUSED CAR)Increased anion gap(Mn: MUDPILES)Decreased anion gap(Mn: BPH-M)F- Fistula pancreaticM - MethanolBromide intoxicationU- UreterosigmoidostomyU - UremiaPlasma cell dyscrasiaS- Small bowel fistulaD - DKA/ AKA/ SKA (diabetic/alcoholic/ starvation)HypoalbuminemiaE- Extra chlorideP - Paraldehyde / phenforminMonoclonal proteinD- Diarrhea1 - Iron / INH C- Carbonic anhydraseInhibitor (acetazolamide)L - Lactic acidosis A- Adrenal insufficiencyR- Renal tubular acidosisE - Ethylene glycol S - Salicylates