Black blood, is it a sign of disease? What blood shows that the body is unhealthy?

Hello, from my personal point of view. Nowadays, people pay more and more attention to blood donation, which is good for health. So many of us can check our health while donating blood.

But when a friend drew blood, he found it was black. At this time, it will be taken seriously, which may be a sign of disease. But if this happens when donating blood, it is normal, so don't worry. Let me tell you something about blood color. Does it imply unhealthy?

1, blood color is black when donating blood.

First of all, we should understand that venous blood is taken when donating blood. Anyone with medical knowledge knows that venous blood is dark when it first comes out. If you don't look carefully, you will feel black. This is actually a very normal phenomenon, because the blood drawn from the venous blood bowl is definitely black, so there is no need to worry about whether it is a health problem.

2, arterial blood, black color is not normal.

When blood is drawn, if arterial blood is drawn, it is found that the blood is dark black. At this time, we will pay attention to it, which shows that there may be some diseases in our bodies. The most basic thing is that blood vessels are blocked, or some conditions such as high blood pressure can cause it. If you encounter such a similar situation, you must check your body in time.

Finally, to sum up, when I donate blood, the blood color is black, which means it is healthy because it is venous blood. If the color of arterial blood is black, it is obviously abnormal and unhealthy. Because the color of arterial blood is bright red.