Minn. Stat. § 145.41: BLOOD DONATIONS, AGE OF DONOR.

(a) Any person of the age of 17 years or over may donate blood in any voluntary and noncompensatory blood program without the necessity of obtaining parental permission or authorization.

(b) A person who is 16 years of age may donate blood in a voluntary and noncompensatory blood program if the person obtains written permission from the person's parent or guardian.