The cytology of the normal cyclic endometrium.

Endometrial cytologic samples obtained with Cohen's endocyte from 501 normally menstruating women were studied and correlated with histologic sections from cell blocks. In this article, the cytologic diagnostic criteria for normal cyclic endometrium are pointed out. The diagnostic accuracy of normal cyclic endometrium has been 92%. A possibility of a cytologic dating is discussed. The diagnostic accuracy was 71.8% for early proliferative endometria, 82% for late proliferative, 93% for early secretory, 81% for midsecretory, and 60% for late secretory endometria.