Table 4 Comparison of progesterone (P4) sensitivity and specificity relative to pregnanediol glucuronide (PDG) in the exploratory cohort (ovulation had not been otherwise identified). P4, progesterone; PDG, pregnanediol glucuronide.

From: Confirmation of ovulation from urinary progesterone analysis: assessment of two automated assay platforms

  PDG above luteal threshold concentration PDG below luteal threshold conentration  
Ovulatory cycles (n = 20, from 13 women)
   P4 single sample cut-off confirmed ovulation 25 2 Sensitivity of single sample cut-off P4 relative to PDG: 0.89
   P4 single sample cut-off did not confirm ovulation 3 41 Specificity of single sample cut-off P4 relative to PDG: 0.95
   P4 two sample percent rise confirmed ovulation 139 38 Sensitivity of P4 two sample percent rise relative to PDG: 0.95
   P4 two sample percent rise did not confirm ovulation 8 375 Specificity of P4 two sample percent rise relative to PDG: 0.91
Anovulatory cycles (n = 22, from 14 women)
   P4 single sample cut-off confirmed ovulation 0 2 Sensitivity of single sample cut-off P4 relative to PDG: 1.00
   P4 single sample cut-off did not confirm ovulation 0 86 Specificity of single sample cut-off P4 relative to PDG: 0.98
   P4 two sample percent rise confirmed ovulation 26 47 Sensitivity of P4 two sample percent rise relative to PDG: 0.87
   P4 two sample percent rise did not confirm ovulation 4 539 Specificity of P4 two sample percent rise relative to PDG: 0.92