FGF23 and hyperparathyroidism: After adjusting for serum calcium, phosphate, fibroblast growth factor 23, and use of alfacalcidol, the Bb genotype was a significant predictor of developing both moderate (OR,3.88; 95 CI 1.13–13.25, p = 0.03) and severe hyperparathyroidism(OR, 2.54; 95 CI 1.08–5.96, p = 0.03).