Blood clots form naturally as a way to stop bleeding when someone is injured. But blood clots in patients with medical issues, such as mechanical heart valves or other heart conditions, can lead to a stroke or heart attack.
Smartphone app can vibrate a single drop of blood to determine how well it clots washington.edu - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from washington.edu Daily Mail and Mail on Sunday newspapers.