SAEDNEWS: A blood transfusion is a medical procedure in which a certain amount of blood is taken from one person and given to another person who needs it.
According to Saednews, When you need a blood transfusion, it means that your body does not have enough healthy blood to function properly. The heart pumps blood through the blood vessels, delivering it to different organs and tissues throughout the body. One of the most important functions of blood is to carry oxygen to the body's cells. As we all know, without oxygen, the body cannot survive.
The following are religious rulings regarding blood transfusions during the holy month of Ramadan and while fasting, according to several prominent Shia Islamic scholars:

Question: Does receiving a blood transfusion invalidate the fast?
Answer: No, the fast is not invalidated.
Question: Does a blood transfusion invalidate the fast of a person who is fasting?
Answer: As a precaution, the person should complete the fast of that day and make it up afterward.
Question: What is the ruling on receiving a blood transfusion while fasting?
Answer: It invalidates the fast.
If a person is ill, their fast is not valid, regardless of whether they receive a blood transfusion or not.
The ruling on receiving a blood transfusion while fasting may differ according to the religious authority a person follows. Those observing a fast should refer to the ruling of their own marja (religious authority) for guidance.