Coordinating Document Validity with travel dates.

Apologies if this is answered somewhere here. I did search but did not find. As a US citizen, the OA application wants:

A health certification stating no prohibiting disease on an official form not greater than 90 days.

A clean criminal history record not greater than 90 days.

Are these associated with your date of travel, or your issue date?

Say I have both documents generated today, and I apply for the OA visa a month from now. and am approved in 15 days. Do i need to travel before those documents expire, or do I have a set expiration based on issue date? "Must travel within XX days"?

Asking because I had my last Dr appointment with My PMD today, and he was nice enough to complete the health form, but now I am not sure if it will work for a travel date in early December.