Characterizing the endometrium in unexplained and tubal factor infertility: a multiparametric investigation.

Objective: To characterize endometrial development in unexplained and tubal factor infertility.

Design: Prospective study of 20 women with unexplained infertility, 22 with tubal factor infertility, and 21 fertile controls in the midproliferative, periovulatory, and midluteal phases of the menstrual cycle.

Setting: Reproductive Medicine Department of St.