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Table 3 Sensitivity of peak day method for determining estimated day of ovulation compared to Clearblue® Easy fertility monitor in 26 cycles

From: Pilot test and validation of the Peak Day method of prospective determination of ovulation against a handheld urine hormone monitor

  Exact day ≤1 day ≤ 2 days ≤ 3 days >3 days
  n (%) n (%) n (%) n (%)  
“Last fertile sign1” algorithm including seven days prior to menses 4 (15) 13 (50) 18 (69) 18 (69) 8 (31)
“Last fertile sign1” algorithm excluding seven days prior to menses 5 (19) 14 (54) 20 (77) 20 (77) 6 (23)
“Best quality2” algorithm including seven days prior to menses 5 (19) 17 (65) 23 (88) 24 (92) 2 (8)
“Best quality2” algorithm excluding seven days prior to menses 5 (19) 17 (65) 23 (88) 24 (92) 2 (8)
  1. 1Last day during a menstrual cycle when a woman observed any of the three fertile-type cervical fluid characteristics.
  2. 2Last day during a menstrual cycle when a woman observed the most number of fertile-type cervical fluid characteristics.