NIST traceable calibrations are often called ISO 9001 calibrations. In the ISO/IEC 17025 world, the term we should use is metrological traceability, and the chain of comparisons is to the SI unit, not any particular national metrology institute (NMI). The vast majority of the global NMI's participate with each other in comparisons to most of the highest precision measurements to measure or realize many of the SI units or other indirect unit. The participants recognize each other through these key comparisons, and thus the traceability chain can channel through any one of them in most cases. This means that a lab in the United States may have a very satisfactory metrological traceability for some of their measurements that have no participation from NIST in their chain of comparisons.