Asymptomatic Severe Hypocalcemia Secondary to Vitamin D Deficiency in an Elderly Patient

Table 1

Initial blood chemistry studies.

Test (unit)	Value (normal range)
Serum calcium (mg/dL)	5.2 (8–10.5)
Ionized calcium (mmol/L)	0.79 (1.1–1.4)
BUN (mg/dL)	16 (7–18)
Serum creatinine (mg/dL)	1.4 (0.5–1.4)
Phosphorous (mg/dL)	4.7 (3.0–4.5)
Albumin (mg/dL)	3.4 (3.5–4.8)
Alkaline phosphatase (U/L)	313 (20–70)
Serum iPTH (pg/dL)	462 (14–72)
25-hydroxyvitamin D (pg/dL)	4 (10–55)

Blood urea nitrogen (BUN); intact parathyroid hormone (iPTH).