Specimen Name Result Units Range
Plasma Sodium 144 mmol/L (135-145)
Potassium 4.0 mmol/L (3.5-5.5)
Chloride 97 mmol/L (100-109)
Bicarbonate 25 mmol/L (22-32)
Urea 2.5 mmol/L (2.7-7.2)
Creatinine 70 μmol/L (60-110)
Phosphate 0.71 mmol/L (0.80-1.45)
Total Calcium 1.84 mmol/L (2.10-2.55)
Albumin 22 g/L (34-48)
ALP 700 U/L (30-110)

47 male with known cirrhosis.

What is the calcium disorder?
Hypocalcaemia 2° Hypoalbuminaemia
  • ionized Ca++ was normal (1.12 mmol/L)
  • cirrhosis frequently → alkalotic (CNS respiratory effect) → ↓ ionized Ca++

 

Corrected calcium = [Ca++]mmol/L + 0.02 × (40 − [Alb]g/L)

≈ 1.84 + 0.02*(40 − 22) ≈ 2.2 mmol/L