Bob,
you have to validate your sterilisation process, since you can only verify sterility by adestructive testing that renders the product un-usable for its intended use.
Still, whether you employ an ethylene oxide or irradiation sterilisation process, the respective standards provide you with guidance how to validate single batches:
Ethylene oxide: ISO 11135:2014/AMD 1:2018, Annex E, Single Batch release
Irradiation: ISO 11137-2:2013, sections 9.3 and 9.5, Procedure for Method VDmax25/15 for a single production batch
HTH,