Md. Code, Health - General § 17–211

(a) A laboratory issued a license under this subtitle shall enroll in and continue to demonstrate satisfactory performance as defined by the Secretary by regulations in a proficiency testing program or programs approved by the Secretary.

(b) The Secretary shall adopt regulations that:

(1) Define satisfactory proficiency testing performance; and

(2) Set the standards and requirements that a proficiency testing program must meet before it can be designated as an approved program.