Like Sarah said, 12 months before they will usually do any testing. We had the CD21 Blood test and Ultrasound then DH had a sperm test, even though we already had a child together. Our 1st visit was around 2 years TTC, then got serious and followed it up again a couple of years later. If you haven't been TTC for 12 months, and do start the pre testing phase, I would think they would make you do it all again once you got to the 12 month mark so they had 'current' results IYKWIM?