Normal blood sampling for laboratory tests or normal blood donation will not cause anemia.
Under normal circumstances, if blood is drawn only for clinical tests, the amount of blood drawn is very small, and the number of red blood cells contained in the blood drawn is also very small, which will not cause anemia and has no effect on the human body in general. Even if there are more checkup items under special circumstances, it has no effect on the total amount of blood in the human body.
If it is a normal way to donate blood, each time a healthy adult donates 200 to 400 milliliters of blood, there is no effect on the body at all, and it will not lead to anemia. If there is dizziness after blood donation, it can be relieved after resting, which is a normal phenomenon. It is not recommended to donate blood if you are anemic yourself.
Therefore, as long as the blood is drawn and donated in regular hospitals and through regular channels, it will not lead to anemia.