The USCIS announced last week that effective November 1st, 2018, they will require applicants to submit form I-693 Report of Medical Examination and Vaccination Record that is signed by a civil surgeon no more than 60 days before filing the underlying application for immigration benefit. This applies to the adjustment of status or application to register permanent residency. For our customers, you'll want to make sure that you complete that medical examination probably at the last stage, at the very last step before you mail your petitions or your applications to USCIS because in most cases that medical examination would expire.
As many of you know the Department of State is scrutinizing applications more, changing rules, and basically doing all they can to make the process of obtaining a green card more difficult. Make sure you get the medical exam right when you submit your paperwork so that it doesn't expire, and so you also give yourself enough time in case your application is rejected for incorrect payment amount or a check was returned from the bank or any other hold up comes about so you give yourself a little room or buffer in that process.
The process for all immigrant visa petitions and for the K1, which is technically a non-immigrant visa petition, requires the applicant to have a medical exam. So when you're in a foreign country you're typically going to have that just before your interview. During this exam, they're looking for communicable diseases, signs of drug abuse, and other factors which you can check the government form I-693 for details on.
In the event your exam expires, you would need to get another exam in the U.S. at your expense by a designated civil surgeon's office.