For instance, there’s a watchlike device equipped with a sensor that measures the amount of chloride excreted in sweat. Increasing levels of chloride predict hormonal surges a few days before ovulation, giving you more notice than standard urine tests. Saliva-based microscope monitors, meanwhile, measure the levels of estrogen in electrolytes found in the saliva. You place a small sample on a lens, which is examined under a microscope after it dries. When estrogen levels rise—indicating a fertile phase—you see a distinct, fernlike pattern. The electronic version of this test makes interpreting the results even easier.
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Secrets of Sweat and Saliva
Urine isn’t the only bodily fluid that can predict ovulation. Some newer tests now use sweat or saliva to determine the fertile window. If you're trying to get pregnant, find the best times for sex with our Fertility Calculator.