AMNIOTIC FLUID CRYSTALLIZATION TEST FOR RUPTURED MEMBRANES.

A simple and inexpensive test is described which permits positive identification of amniotic fluid by its fern-type crystallization. It permits a rapid and certain differential diagnosis between leukorrhea, hydrorrhea, urinary incontinence and spontaneous amniotomy. The crystallization test was shown to be most reliable and the few sources of error are easily avoided. The test is inhibited by cellular debris or blood when it is in a concentration greater than 1:10. Centrifugation permits the reappearance of fern-leaf crystallization. The typical image resembles that of the crystallization of cervical mucus. However, amniotic fluid crystallizes on the entire smear, whereas mucus crystallizes in a linear fashion. Cervical mucus crystallization is normally absent during pregnancy. It may occur in cases of threatened abortion. The authors have performed the test in combination with a nitrazin paper test in a series of 192 patients. In their hands it has given nearly perfect results.