Known also as an E2 test, an estradiol test measures the amount of the hormone estradiol in your blood, which is essential for bone and joint health in females and helps control how fat is distributed ...

Christina Majaski writes and edits finance, credit cards, and travel content. She has 14+ years of experience with print and digital publications. Khadija Khartit is a strategy, investment, and ...

The best at-home COVID-19 tests are FDA-authorized, easy to use, accurate, quick, and can also detect flu viruses. Lauren Paige Richeson is an Editor at Health, where she’s been writing, editing, and ...

Mark Gurarie is a writer covering health topics, technology, music, books, and culture. He also teaches health science and research writing at George Washington University's School of Medical and ...

Numerous gadgets, from remote controls to hearing aids, depend on small batteries. It’s vital to know when these batteries are close to being drained so they can be substituted before they’re fully ...

The top free internet speed test apps are Meteor for app-specific performance insights, Speedtest by Ookla for all-around network testing, and FAST Speed Test for quick ad-free checks. Several factors ...

Compare the best penetration testing tools for 2026, including pricing, key features, use cases, and top picks for modern security teams today. Penetration testing tools help security teams identify ...

An antinuclear antibody (ANA) test checks your blood for certain types of antibodies called autoantibodies. Autoantibodies commonly develop in people with autoimmune conditions, but they can show up ...