Table 1.

Biochemical and US examinations at baseline and during a 96 months (8 years) period of PHPT follow-up in our patient with primary hyperparathyroidism.

Parameter	Normal range	Baseline	3 months after US-FNAB	105 months after US-FNAB
Serum calcium (mg/dL)	8.5–10.6	11.3	9.3	9.3
Corrected calcemia*	–	11.1	9.1	9.1
Serum phosphorus (mg/dL)	2.5–5.1	2.3	3.0	3.0
Urinary calcium (mg/24 h)	100–300	330.2	104.0	102.0
Serum PTH (pg/mL)	15–88	249.0	90.1	53.1
25-OH vitamin D (ng/mL)	30–100	21.9	–	33.0
Creatinine (mg/dL)	0.5–1.2	0.8	–	0.7
GFR** (mL/min/1.73 m2)	60–90	67.6	–	70.1
Neck US		4.6 × 16.1 × 28.8 mm (volume 1.1 mL) enlarged parathyroid	No evidence of the enlarged parathyroid	No evidence of the enlarged parathyroid

*Corrected calcemia was calculated using the formula: corrected calcemia (mg/dL) = total serum calcemia (mg/dL) + 0.8 × (4 – serum albumin (g/dL)); **glomerular filtration rate (GFR) was calculated using the Cockcroft–Gault formula normalized for body surface.