IVF Clinics are central to advanced infertility treatment. If you are over 35 or been trying to get pregnant for more than 9 months, or if clomiphene (Clomid or Serophene) hasn't worked in 3 to 6 months, this is the place to start.
Although they are called "IVF Clinics" the physicians and staff provide a large range of intertility treatments, including IVF (in vitro fertilization). They may even re-do some of the low tech treatment that took place at the general Ob/Gyn. The physicians at an IVF clinic have much more experience dealing with infertility patient needs than a general Ob/Gyn.
The overwhelming majority of patients wish they were referred, or self-referred sooner ... especially considering the biological clock doesn't stop.
One of the most important aspects of an IVF clinic is the lab. The embryologist(s) help "patients" who can only be seen under a microscope.
The lab is often credited with a significant amount of an IVF clinic's success in helping you have a baby and may be a factor in your consideration for the selection of that clinic.