Why is the blood color black?

There are many examination items in clinical practice, one of which is blood drawing. Many diseases require blood tests to be confirmed. Many people are curious about the color of blood when it is drawn. Most people still consider the color of blood to be bright red, so seeing the color of blood turn black will make many people feel doubtful or even worried. So why does the blood turn black when it is drawn?

1. It is normal for human venous blood to be black and dark in color because it contains carbon dioxide and has a relatively low oxygen content. Don't worry or be afraid, have a blood lipid test. If the blood lipids are high, it may be hyperlipidemia. It may also be due to long-term irregular diet, bad mood and other factors that lead to poor circulation of qi and blood in the body, qi stagnation and blood stasis, resulting in insufficient oxygen and organic matter in the blood. It is recommended to pay attention to your diet, eat light food, eat more fruits and vegetables, and eat less fish, meat, fat, and foods high in salt.

2. If the blood is dark, it is usually related to blood heat or high blood lipids, and should be adjusted in time to avoid affecting the health of the body. Suggestions: Hello, this does not mean that there is inflammation, but simply the blood is dark will not affect blood donation, unless there are other diseases, such as some infectious diseases, hepatitis, etc. For the sake of future health, you should also pay attention to timely adjustment.

3. The blood contains a molecular particle called melanin. When it is more viscous, the melanin is denser, so the blood looks black. The dark color of blood is also due to the low oxygen content in the blood. Another possibility is that black blood may appear due to local congestion. If it is the last possibility, just drink more water and exercise.