CFR›Title 7›Subtitle B›Chapter I›Part 91›Subpart D ContainsSections 91.15–91.18CorpusDaily eCFRDisplayed edition2026-05-07Last updated2026-05-07 Subpart D—Laboratory Service Sections 91.15 § 91.15 Basis of a laboratory service. 91.16 § 91.16 Order of a laboratory service. 91.17 § 91.17 Postponing a laboratory service. 91.18 § 91.18 Financial interest of a scientist. Previous C Subpart C—Application for Services Next E Subpart E—Samples