This post is part of a series about what to do while your Priority Date is retrogressed, once you have received your I-140 Approval Notice from USCIS. It applies to cases which will be processed through US Consulates, and not to Applications to Adjust Status filed in the US.
Police clearances are valid for one year.
Medical examinations are good for six months (as opposed to exams submitted with Adjustment of Status cases, which are good for one year).
Birth certificates, marriage certificates, divorce decrees, and other biographical records do not expire.
Professional licenses expire on the date set by the professional licensing board that issued them.
VisaScreens expire five years after they are issued.
If your documents expire before your Priority Date becomes current again, the NVC will send you a letter asking you to update them.