Joy-girl

Thanks. My conversation has been with the NVC ( not the embassy in Lagos).  They told me that I may need to call Lagos and as to re-schedule the interview date if the letter does not get to me soon enough.  We called one of the medical places and they will accept our letter that states that we have been documentarily approved by the NVC as long as  it has our case number.  It also takes 7 days to get medical results back. I just confirmed with the clinic.  The question now is how long to wait before calling the embassy to re-schedule.
 

I  have actually called 3 different times to confirm and got the same answer.  On other forums, people have mentioned up to a week's notice before their interview.
 

Just get more clarification about the 'citizenship" concern that has been mentioned by many.  Non-US citizens also have SSN including international students etc.