We manufacture measuring units for industry and of course we calibrate our instruments before we ship then as well later on. So we are a calibrating lab... There is a special 17025 part that is for calibrating laboratories... what is it called?
ISO 17025 is applicable for testing and Calibration laboratories. ISO 17025 has clear Reporting Result requirements in clause 7.8 and specifically for calibration reports in clause 7.8.4 Specific requirements for calibration certificates.
Depending on your activities, certain ISO 17025 requirements will not be relevant, for example, Sampling (clause 7.3); whereas others will need more detail, for example, evaluation of Measurement uncertainty (clause 7.6). Measurement uncertainty must be evaluated for all calibrations and reports. The accreditation body requirements are typically documented, with reference to ILAC (The International Laboratory Accreditation Cooperation) policies and guidelines.
See too, Appendix A3 Demonstrating metrological traceability, where Calibration and measurement capabilities are addressed for calibration laboratories. The Scope must be defined clearly, according to the accreditation body programs.
Furthermore, careful consideration of decision rules must be made as typically for calibration, a statement of conformity to a specification or standard for the calibration (e.g. pass/fail, in-tolerance/out-of-tolerance), is made. For more information refer to https://ilac.org/publications-and-resources/ and become familiar with ILAC G8:09/2019 Guidelines on Decision Rules and Statements of Conformity and ILAC P14:09/2020 ILAC Policy for Measurement Uncertainty in Calibration.