What color is blood

Blood is always red. However, when it is deoxygenated, it becomes a darker shade of red. When it is oxygenated, it is bright red. Veins appear blue because the tissue on the outside of the vein is a bluish color. The blood on the inside, ho…

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Blue – but then I’m a lobster, and have copper-based compounds to carry oxygen round my body. This is why I answer questions quite slowly, as typing doesn’t come naturally to my pincers. Humans only ever have red blood, due to the iron-ba…

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Human blood is ALWAYS red. Really. Anyone who says it’s blue is mistaken. This is plainly obvious if you ever donate blood. Phlebotomists always take blood from veins, they are required to do it without exposing it to air, and it always loo…

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Related Questions Answered on Y!Answers

What color is blood before it leaves your body?

Q: I know that once the blood gets contact with oxygen, it turns red, but what is the real color before that happens.

A: Darker red. I know, it looks blue through your skin, but that’s because your skin scatters light, just like the sky does. All blood in your body is red, just different shades of red.

Why are citrate blood collection tubes color coded specifically and universally light blue?

Q: Are there any international norms for color coding blood collection tubes? If yes why specifically light blue for citrate, lavender for edta etc. Please let me have the links for the explanation if you know of any.

A: Why not? It’s just the way that they designed it when they first started making the test tubes that they decided to make all of the certain types of tubes the same universally colored tops. They could have just as easily made the citrate blood collection tubes colored orange… or green. The color itself doesn’t matter, as long as the same color is used universally for each test type.After all, if they were sent to a lab for testing, wouldn’t it be easier for that lab to sort them into the proper testing area if they were all the same color? It makes it more efficient and helps the lab to make sure they aren’t doing the wrong test much easier. Personally, I think it was a great idea that they did it, just for the testing facility

Why is the color of the blood different for some people?

Q: The color of blood for some people is dark red and some light red.What factor/s affect the color of blood in humans.

A: The amount amount of oxygen in blood, changes how bright red the blood will look. The more oxygen there is in the blood, the brighter red it will appear.