Please don't be hurt by IAAL - he has personal issues he is airing a little too publicly
Re the I-693 - I just had that done. I had evidence from my family physician at home of having my vaccinations done (and a few redone already due to low titres) so he drew blood to recheck the titres. They do a serum HIV and syphilis and a subcutaneous injection of PPD to check for exposure to tuberculosis. You go back in two days to see if the PPD was negative and the labs will be back. If everything is okay, then you get your paper that day.
Good luck!