There was a way to measure the level of oxygen in the blood using a smartphone camera.

American scientists have figured out how to use a smartphone camera to measure saturation - the level of oxygen saturation in the blood. Usually, doctors use a pulse oximeter for this - a small device that resembles a clothespin and is worn on a finger. To measure saturation with a smartphone, you need to put your fingertip on the camera. There, flashes of red, green and blue will turn on in turn. The process will take about 15 minutes. The camera will record how, with each heartbeat, blood flows over the illuminated part of the finger and absorbs the light from the flash. Based on this data, specially trained artificial intelligence will calculate the level of oxygen in the blood.