Criteria for Parathyroid Surgery in Patients with Asymptomatic Primary Hyperparathyroidism
| Variable | Criterion |
|---|---|
| Serum calcium concentration | 1.0 mg/dL above upper limit of normal |
| 24-h urinary calcium excretion | >400 mg |
| Reduction in creatinine clearance | >30% |
| Bone mineral density | t score below −2.5 at any site |
| Age | <50 y |
Adapted from Bilezikian and Silverberg (2).