Md. Code, Health - General § 20–101

(a) Notwithstanding any other provision of law, a minor who is at least 17 years old, without the consent of a parent or legal guardian, may give blood to a program that:

(1) Is voluntary;

(2) Does not pay money for the blood; and

(3) Is approved by:

(i) The American Association of Blood Banks; or

(ii) The American Red Cross.

(b) (1) Notwithstanding any other provision of law, a minor who is at least 16 years old, and has obtained the consent of a parent or legal guardian, may give blood to the programs listed in subsection (a) of this section.

(2) Consent may be obtained via telephone or electronic means.