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A study was carried out to compare the efficiency of vaginal electrical impedance with serum progesterone profile, cytological examination and clinical findings. Vaginal electrical impedance values varied at the different stages of the estrous cycle, with the highest value during the transition into estrous and the lowest in diestrus (P< 0.05). There was a negative statistical correlation between serum progesterone values and the impedance values (36%) (P< 0.001). Vaginal electrical impedancedoi:10.21521/mw.6080 fatcat:xiujhdcguzginlywbfogmncoge