This document summarizes fertility clinic rankings in California based on the GCR Index. The top 10 clinics are listed, with USC Reproductive Endocrinology and Infertility and Stanford Fertility and Reproductive Medicine Center ranked first based on their scores of 3.5 out of 5. The rankings are calculated using hundreds of performance indicators across four pillars: clinic expertise, facilities, services, and patient feedback. The GCR aims to help patients compare clinics and help clinics understand their reputation in order to improve patient satisfaction.