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Table 3 Sensitivity, Specificity and Youden index of serum calcium, PTH, Calcium×PTH and Pfindex in diagnosis of NPHPT

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

 Sensitivity (%)Specificity (%)Youden index
PFindex> 3494.494.60.890
Calcium> 2.4591.789.20.809
PTH > 11.7194.475.70.701
Calcium*PTH > 31.7391.786.50.782
Ca/P > 2.7182.291.90.741