Running extreme distances may strain more than just muscles and joints. New research suggests ultramarathons can alter red blood cells in ways that make them less flexible and more prone to breakdown, ...

Red blood cells transport oxygen throughout your body, including to vital organs and tissues. They also help your body get rid of carbon dioxide. Too little or too many red blood cells may be ...

Red blood cells carry oxygen from the lungs to every other organ, and blood-forming stem cells must make about 200 billion new red blood cells each day to keep the oxygen flowing. For many years, ...

What Is an MCHC Blood Test? A mean corpuscular hemoglobin concentration (MCHC) blood test measures the amount of a protein called hemoglobin in your red blood cells. It’s one of many measurements ...

What Is an MCV Blood Test? MCV stands for mean corpuscular volume. An MCV blood test measures the average size of red blood cells, which have the critical job of carrying oxygen to your organs. If ...

Red Cross phlebotomist technician Michael Reihms draws blood from double-red participant Shaun Ralston at the blood drive at the Red Cross headquarters in Concord on Friday, February 28, 2026. Ralston ...

As blood banks across the U.S. report dangerously low supplies of O-negative blood (red blood cells), anesthesiologists are calling for increased donation and changes in how hospitals use this ...

A new study from Gladstone Institutes shows red blood cells act as hidden glucose sponges in low-oxygen conditions, explaining why people living at high altitude have lower diabetes rates and pointing ...

Research shows that anything from walking to strength training may add years to your life, underscoring the importance of exercise. But there are so many different ways to get your blood pumping, and ...

Safi Biotherapeutics is working to manufacture inexpensive red blood cells at scale. The company has received more than $16 million from the U.S. Department of Defense and on Wednesday announced a $5 ...

In a pair of fluorescent-lit rooms on both sides of the Atlantic, the guinea pigs awaited their fate. They were not literally guinea pigs. Two were lightly sedated, extremely fluffy white rabbits ...

In a routine blood test that turned extraordinary, French scientists have identified the world’s newest and rarest blood group. The sole known carrier is a woman from Guadeloupe whose blood is so ...