For how we live.
In a study of 750 women, those with 'low' ovarian-reserve hormones were no less likely to conceive. Professional guidance says the test shouldn't be used to counsel women who aren't already infertile.
Self-testing and self-managing warfarin cut clot events by roughly 40%, and self-management also lowered deaths — one of the few at-home tests with randomised evidence of real benefit.
New at-home molecular tests catch most established colorectal cancers, but find only 13–43% of the advanced precancerous polyps a colonoscopy is meant to remove before they become cancer.
Consumer kits reliably estimate sperm concentration, and a smartphone assay matched lab classification ~98% of the time. But a normal count can't rule out the motility, shape and DNA problems a full analysis checks.
Two BMJ reviews found high-risk usability problems in 18 of 30 tests, and use judged contrary to evidence-based guidance for 11 of the 19 conditions covered.