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Secrets of Sweat and Saliva

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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