Metabolic acidosis with compensation

• Facts:
  pH < 7.4, PCO2 < 40 mmHg
  Calculate anion gap ( Na - [Cl- +HCO3-] )
• Diagnosis:
  Increased anion gap ("MUDPILES")
  
  M ethanol / formaldehyde (formic acid)
  U remia (impaired excretion of H+)
  D KA (beta-hydroxy butyrate, acetoacetic acid)
  
  P araldehyde
  I ntoxication
  L actic acidosis (lactate)
  E thylene glycol (glycolic acid, oxalic acid)
  S alicylates (ASA ingestion)
  
  Normal anion gap (8-12 mEq/L)
  
  Diarrhea
  Glue sniffing
  Renal Tubular Acidosis
  Hyperchloremia