Del. Code tit. 24, § 1769

A person certified to practice medicine who bills patients or third-party payors for individual tests or test series administered by any private or hospital clinical laboratory shall disclose on the bill the name of the laboratory, the amount or amounts charged by the laboratory for individual tests or test series and the amount of any procurement or processing charge made by the person certified to practice medicine for each test or test series. A test or test series performed at a state laboratory or at another laboratory at which no charge is made must be noted on the bill.