My wife got FTJ IV visa stamped in her passport in Chennai. EB3 - PD 4/30/2001.
Below is the process, in her words, she went thru:
Medicals:
Called two days ahead for a 10.00 AM appointment with "Lister METROPOLIS Laboratory Research Center Pvt. Ltd" and a 4.00 PM appointment with "Dr. Mathai Thomas".
Flew in from Hyderabad to Chennai, had in-flight breakfast, took a taxi from airport to the Lab, 30 min ride.
When an I-485 is accepted at the Service Center, requests for FD-258 FBI fingerprint checks, fingerprint fees, and G-325A consular background checks are made by USCIS. Responses to these requests come back to USCIS and must be matched up with the appropriate files held in staging. File Maintenance "file connects" these responses to the corresponding files.
My wife and I had our passports stamped after a 6 hour ordeal that started at 8:30 a.m. and ended at 2:30 p.m. Here are some tips based on what we experienced,
1. For an 8:40 appointment, get there before 8 if at all possible. They were not checking appointment timings, so people with 9/10 a.m. appointments were ahead of us in the line. All they care is that you have an appointment for that day.