Compare the 6 best free internet speed test apps for 2026. Test Wi-Fi speed, latency, upload and download performance, and diagnose connection issues.

The FM/a test is still new and subject to research. Many doctors don’t use it yet, and insurers may not cover the cost. Doctors may still use current diagnostic criteria as confirmation. Fibromyalgia ...

Cortisol, also known as the stress hormone, plays a vital role in the body by maintaining blood pressure and blood sugar. It also breaks down carbohydrates, lipids (fats), and proteins. Cortisol can ...

A polymerase chain reaction (PCR) test detects genetic material from a pathogen or abnormal cell sample. Ways of collecting samples include a nasal swab, a saliva swab, or taking a sample of blood.

A false positive result is possible with a rapid COVID-19 test. It happens when a person does not have COVID-19 but still tests positive for the disease. People can use a rapid COVID-19 test at home ...

As the nation experiences what many experts believe is the second-largest wave of COVID infections since the pandemic started, many Americans will be checking to make sure they don’t have the ...

If you live with performance anxiety, taking a test can be overwhelming. But test anxiety can be managed and these tips may help. Test anxiety is a common form of performance anxiety, which can create ...

Longevity isn't just about how long you live — it's also about staying healthy for as much of that time as possible. The "sit to stand" test can be a good way to figure out how healthy you are, and it ...

DNA ancestry testing has come a long way, making it far easier to explore where you come from and what your genes can reveal. As these services grow in popularity, more companies are entering the ...

A lipase test is a blood test that measures the level of a digestive enzyme called lipase in your blood. It may also be referred to as a serum lipase or LPS. What is lipase? Your doctor might order a ...

We regularly answer frequently asked questions about life during the coronavirus crisis. If you have a question you'd like us to consider for a future post, email us at goatsandsoda@npr.org with the ...

What Is an EEG (Electroencephalogram)? An EEG, or electroencephalogram, is a test that records the electrical signals of the brain by using small metal discs (called electrodes) that are attached to ...