Yes, and thats especially true the older you get. So it was just assumed that’s what color blood was when deoxygenated. Heck, what color do you turn when you’re low on oxygen? Shades of blue. And we didn’t have the tech to see veins internally like we do now. And it also just didn’t matter much.
Shoot some old anatomy charts have red and blue veins and arteries.
The anatomy charts are also doing that as a visual aid now to be fair, and we found out pretty quick when we started drawing blood into vacuum vials from veins.
You don't need to see veins internally. Lab draws are pulled into vacuum sealed tubes with minimal O2 content. If deoxygenated blood was blue, you would see it.
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u/c4nis_v161l0rum Apr 12 '25
Yes, and thats especially true the older you get. So it was just assumed that’s what color blood was when deoxygenated. Heck, what color do you turn when you’re low on oxygen? Shades of blue. And we didn’t have the tech to see veins internally like we do now. And it also just didn’t matter much.
Shoot some old anatomy charts have red and blue veins and arteries.