Table 1.

Depicting the laboratory investigations of both the siblings.

Serial number	Investigation	Normal levels	Levels in Case  1	Levels in Case  2
1	Serum inorganic phosphorus	4.5–5.5 mg/dL	3 mg/dL	2.8 mg/dL
2	Serum alkaline phosphatase	100–644 IU/L	1143 IU/L	1378 IU/L
3	Vitamin D	20–50 ng/mL	15 ng/mL	12 ng/mL
4	Serum chloride	98–106 mMol/L	113 mMol/L	89 mMol/L
5	Serum potassium	3.4–5.2 mMol/L	3.2 mMol/L	2.5 mMol/L
6	Serum bicarbonate	19–25 mMol/L	15 mMol/L	11 mMol/L
7	Serum calcium	8.8–10.8 mg/dL	9.1 mg/dL	7.3 mg/dL