21 C.F.R. § 1.1120
(c) If, within the previous 2 years, the recognized accreditation body conducted an onsite assessment of the laboratory in accordance with ISO/IEC 17011:2017(E) (incorporated by reference, see § 1.1101) to assess whether the laboratory meets the requirements of ISO/IEC 17025:2017(E) (incorporated by reference, see § 1.1101), then the initial assessment under this section: