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Table 2 Sensitivity, Specificity and Youden index of serum calcium, PTH, Calcium×PTH and Pfindex in diagnosis of PHPT

From: New parathyroid function index for the differentiation of primary and secondary hyperparathyroidism: a case-control study

 Sensitivity (%)Specificity (%)Youden index
PFindex> 3496.997.60.945
Calcium> 2.5195.397.60.929
PTH > 11.9685.11000.851
Calcium*PTH > 35.4393.097.60.906
Ca/P > 2.7191.493.90.853