Table 2.

Additional Workup

	Patient's lab value	Normal range
Potassium (mmol/L)	2.7	3.5–5.2
Alkaline phosphatase (U/L)	249	35–120
Phosphorus (mg/dL)	1.7	2.3–4.6
Ionized calcium (mmol/L)	2.17	1.18–1.32
25-hydroxyvitamin D (ng/mL)	35	30–100
1,25-dihydroxyvitamin D (pg/mL)	9.0	19.9–79.3
Intact parathyroid hormone (pg/mL)	<6.3	18.5–88.0
Parathyroid hormone-related peptide (pmol/L)	<2.0	<3.4