I've been going to Dr. O'Dea in Marina del Rey for 2 years and love him. He does good work, I am happy to hand out another review.
He's on informed consent, so the first visit can also be the first treatment- pretty neat. He doesn't always require bloodwork depending on your case and history. You just have to talk to him and he will decide if you need bloodwork beforehand.
The downside for some is that he is expensive and doesn't accept any form of insurance. The upside is that he is a master with subdermal implants, which means treatments every 4-6 months and good results, low emotional impact.
If you are looking for something a little less pricey, there are lots of endocrinologists out there that do accept insurance- probably closer to OC as well. Perhaps others will have some good recommendations.
Good luck Jasmine

And welcome to the site!