21 citations,
September 1977 in “Journal of Pharmaceutical Sciences” Minoxidil levels measured in human blood.
12 citations,
December 2017 in “Scientific reports” The new test can measure very small amounts of testosterone in hair, and grinding the hair up first gives more accurate results.
14 citations,
January 1990 in “Fertility and Sterility” Some patients with high prolactin levels don't show symptoms because they have a form of the hormone that's less active.
1 citations,
October 2023 in “PloS one” Cosmetic hair treatments can increase hair testosterone levels, while natural hair color does not affect it.
February 2023 in “Malaysian Journal of Science. Series B, Physical & Earth Sciences” Analyzing bear poop helps measure their stress without harming them.