I reassured him and sent him to get another blood specimen drawn without a tourniquet. Why? Because I suspected that the ...

Measuring blood glucose levels is critical for maintaining optimal health and identifying sudden changes. Test strips are a ...

Famed biohacker Bryan Johnson and his Blueprint team devised this measure of harmful plastic particles in your blood.

Blood draws for several kinds of diagnostic tests require you to fast for several hours. Eating or drinking anything besides water can skew the results, leading to you needing to be retested. You may ...

Your doctor just mentioned ordering a comprehensive metabolic panel, and you’re wondering what that means and why you need it. Don’t worry — this isn’t some scary, complicated procedure. It’s actually ...

Medically reviewed by Robert Burakoff, MD Key Takeaways A cortisol test measures the level of cortisol in your body to help ...

Add Yahoo as a preferred source to see more of our stories on Google. Grail's Galleri test screens for more than 50 different types of cancer from a single blood draw. (Getty Images) (Getty Images) If ...

Analyzing metabolites from routine blood draws could help doctors catch disease in early stages, then recommend preventative ...

Fasting before blood tests helps ensure accurate results by reflecting your true health status. Schedule blood tests in the morning to minimize waking hours spent fasting. Drink water to stay hydrated ...

Whoop’s test, in comparison, starts at $349 for two per year, and unlike with Oura, you can upload tests done through your doctor’s office to the Whoop app for free. Whoop’s Advanced Labs costs more ...

March 15, 2010 (Atlanta, Georgia) — Using smaller blood tubes decreases the amount of blood collected, does not appear to affect laboratory test results, and reduces the amount of blood drawn overall, ...