BGLAP and hyperparathyroidism: ADR• Hyperparathyroidism (n=8)• Low vitamin D (n=15)• Increased osteocalcin levels (58%)• Lowered serum procollagen type l N propeptide (25%)• Increased serum C-terminal cross-linking telopeptide of collagen (57%)• Increased urine pyridinoline levels (10%)• Increased urine deoxypyridinoline levels (9%)