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What's a Cc of Blood? A "cc" of blood is 1 cubic centimeter of blood. A cubic centimeter is equal to 1 milliliter. The average human has about 5,000 cubic centimeters of blood. Blood is a necessary element within the human physique that distributes nitrogen, oxygen and other nutrients to very important organs. Blood is composed of plasma and blood cells. Plasma incorporates proteins that assist in blood clotting during harm. About half of blood volume is made up of blood cells. Red blood cells carry oxygen to tissues and organs, white blood cells combat infections and platelets help in blood clotting. The American Red Cross collects roughly 15.7 million blood donations yearly in the United States. About 1 pint, or 473 cubic centimeters, of blood is collected throughout the donation. In response to the American Red Cross, one blood donation can save up to 3 lives, as pink blood cells, platelets and plasma can be utilized individually from the blood.
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The Apple Watch Series 6 feels like it has perfected lots of the options I favored about its predecessor. It has a brighter all the time-on show, a more powerful processor, faster charging and two new colorful choices to choose from. However the function I was most excited to try out was its new sensor that measures oxygen saturation in the blood (aka SpO2) with the faucet of a display screen. As somebody who panic-bought a pulse oximeter firstly of the coronavirus pandemic and nonetheless checks her levels at the first sign of a cough, the thought of getting one strapped to my wrist at all times was enough to pique my interest. But in contrast to the ECG function on the Apple Watch, which has been tried, examined and [painless SPO2 testing](https://wiki.insidertoday.org/index.php/Normal_Blood_Oxygen_Levels:_What_Is_Safe_What_Is_Low) cleared by the US Food and Drug Administration, along with the irregular coronary heart rhythm notifications, SpO2 on the Apple Watch still seems to be in its early phases. Navigating all this new knowledge can be daunting for [BloodVitals SPO2](http://ascrew.awardspace.info/index.php?PHPSESSID=7c08bae57e353e6ddf027f7ef4fcaec4&topic=19129.0) anybody who's not a medical professional.
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I purchased an FDA-cleared pulse oximeter, the machine medical doctors use to measure SpO2 on your fingertip, as a precaution when coronavirus cases in the US began to climb. Having low blood oxygen ranges would not guarantee you have COVID-19, however it's considered one of the key signs of the illness. I had read horror tales of people that waited too long to go to the hospital and had died of their sleep as a result of they did not understand their levels had dipped in a single day. You need to at all times examine with a physician if you're experiencing shortness of breath (another symptom of COVID-19), even when a pulse oximeter says you're in a healthy vary, however I discovered comfort in understanding that I might no less than use it as a reference if I ever experienced shortness of breath. That's not something you can do with the Apple Watch -- Apple says it ought to be used for wellness functions only and not as a medical gadget, that means you will have to take the results with a grain of salt and should not use it to display screen for any sort of illness, which is what I had been hoping to get out of it.
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But there may be different benefits of having it strapped in your wrist at all times. Very similar to a pulse oximeter, the Series 6 uses red and infrared gentle from its new sensor to determine the proportion of oxygen within the blood. But as a substitute of shining the sunshine by your fingertip, it makes use of the sunshine that is reflected back from the blood vessels in your wrist to determine your oxygen levels based on the coloration of your blood. During the setup process you are asked whether or not you want to activate SpO2 monitoring, which I did, but you'll be able to always go back and disable it in the settings after the very fact. The very first thing I did after strapping on the Watch was open the Blood Oxygen app. It offers you a couple of tips on tips on how to get the best end result and you'll want to relaxation your arm on a table or flat surface whereas the Watch is taking a reading.
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Then the 15-second countdown begins and you're carried out -- straightforward and [painless SPO2 testing](http://code.sz-chaohui.cn/artbaskett149). I bought a 95% on my first read, which was lower than what I'm used to from my pulse oximeter. Anything above 90% is usually thought-about by clinicians to be inside a healthy range, but most often, greater is healthier. I tested it a few extra instances and got slightly completely different results inside a few proportion factors relying on whether I used to be completely nonetheless and silent during the test, where I had the watch positioned on my wrist and the way tight the strap was. There are many elements that may affect a studying, [painless SPO2 testing](https://www.agecop.pt/ola-mundo/) comparable to skin temperature or [painless SPO2 testing](http://wikitrade.org/index.php/User:FlorrieEstell0) the position of the sensors on the body. Side-by-facet with my pulse oximeter, the Apple Watch was usually off by about one or two points, however generally spot on. What was more attention-grabbing to me was the SpO2 information that collected over time in the Health app .
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