![]() ![]() If your heart rate is too high (above 150 bpm) while at rest, you won't be able to get a successful blood oxygen measurement.The bright red color of crimson is often considered the color of fresh blood, but blood-red color may also describe a dark maroon shade of red. Certain postures, such as arms hanging by your side or fingers in a fist position will also result in unsuccessful measurements. Jacci Howard Bear Updated on OctoReviewed by Michael Barton Heine Jr Share Blood red is a warm color that can be bright or dark red. Motion is another factor that can affect your ability to get successful background or on-demand measurements.Red urine isnt always caused by red blood cells. When to see a doctor See a health care provider whenever urine looks like it might have blood in it. But if blood clots get passed in the urine, that can hurt. (REUTERS/Jonathan Ernst) 'The optics of Biden's speech instantly became a source of Internet chatter with the weird red background that made the President look like he was giving a stump speech. It takes only a small amount of blood to turn urine red. This text is placeholder text to give you an idea of how this color looks when used as a font color on a black background. The ink, pattern, and saturation of some tattoos can block light from the sensor, making it difficult for the Blood Oxygen app to get a measurement. Red blood cells cause the urine to change color. ![]() Permanent or temporary changes to your skin, such as some tattoos, can also impact performance.If you are out in the cold, for example, the skin perfusion in your wrist might be too low for the sensor to work with the Blood Oxygen app to get a measurement. Skin perfusion varies significantly from person to person and can also be impacted by the environment. Observe how a red blood cell travels from the heart to the lungs and other body tissues to exchange oxygen and carbon dioxide See all videos for this article The constancy of the composition of the blood is made possible by the circulation, which conveys blood through the organs that regulate the concentrations of its components. Skin perfusion (or how much blood flows through your skin) can impact measurements.For a small percentage of users, various factors may make it impossible to get any blood oxygen measurement. Even under ideal conditions, your Apple Watch may not be able to get a reliable blood oxygen measurement every time. ![]()
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