Bioequivalence and Bioavailability Forum

Dear all,

We have prepare stock solution of Reference standard for bulk spiking. At that time Reference standard within valid period. From this Stock solution prepared CC and QC samples.

After five days validity of Reference standard Expired as per validity date of COA.
Now my question is
Can we use these CC and QC samples after validity date of reference standard during study sample analysis? We have already prove stock solution stability of reference standard during Method validation at that time Reference standard within valid period.

Thanks in advance.

Regards,
Vishal Nakrani