Enumerated powers. The enumerated powers are a list of items found in Article I, Section 8 of the U.S. Constitution that set forth the authority of Congress. In summary, Congress may exercise the powers that the Constitution grants it, subject to the individual rights listed in the Bill of Rights.
The average adult has 10-12 pints of blood. Someone needs blood every two seconds in the U.S. 40,000 pints: Amount of donated blood used each day in the U.S. and Canada. Through a process of separating blood into its individual parts, a single unit of blood can help extend the lives of as many as three people.
But 7 to 8 g/dL is a safe level. Your doctor should use just enough blood to get to this level. Often, one unit of blood is enough. Some doctors believe that hospital patients who fall below 10 g/dL should get a blood transfusion. But recent research found that: Many patients with levels between 7 and 10 g/dL may not need a blood transfusion. One unit of blood is usually as good as two, and it may even be safer. Some patients in intensive care may do better when they receive less blood. Using more blood units may increase risks.