Specimen Name Result Units Range
Plasma Sodium 140 mmol/L (135-145)
Potassium 2.4 mmol/L (3.5-5.5)
Chloride 84 mmol/L (100-109)
Bicarbonate 39 mmol/L (22-32)
Anion Gap 19 mmol/L (7-17)
Glucose 4.2 mmol/L (3.8-5.5)
Urea 15.5 mmol/L (2.7-7.2)
Creatinine 140 μmol/L (60-110)

Young female. Very low body weight.
Anorexia Nervosa & Self-induced Vomiting (Purging)
  • hypokalemic metabolic alkalosis
  • pre-renal AKI ∝ vomiting / hypovolaemia
  • given very low weight & muscle-mass ↑[urea/creat] ≅ significant impairment

 

Hypokalaemic Metabolic Alkalosis
Diuretics (esp. loop agents) - low Na+, Cl- / high urea
Mineralocorticoid excess - normal-high Na+, Cl- / normal urea
Vomiting / Gastric outlet obs. - very low Cl- / low-normal Na+ / high urea
Diarrhoea / laxatives - low Cl- / normal Na+ / high urea
Post massive transfusion - citrate metabolism & acidosis correction