blood test for gender?

Sam
Have any of you ladys taken the blood test early on in your pregnancy to find out the gender of your baby? I was told by a friend about this test and also the ultrasound tech had metioned it to me when i went to my first ultrasound at 6w4d.. i did some research and read that you can find out as early as 10 weeks. I want to ask my dr about this test my next vist. I will be 9w6d at the time.. i was wondering if any of you ladys have done this test and if so were the result accurate?