From: New parathyroid function index for the differentiation of primary and secondary hyperparathyroidism: a case-control study
Sensitivity (%)
Specificity (%)
Youden index
PFindex> 34
96.9
97.6
0.945
Calcium> 2.51
95.3
0.929
PTH > 11.96
85.1
100
0.851
Calcium*PTH > 35.43
93.0
0.906
Ca/P > 2.71
91.4
93.9
0.853