Nutritional deficiency testing and doctor in NYC

I was wondering if anyone knew of a good doctor or alternative medicine specialist who knows their shit when it comes to nutrition and testing. I have no idea how to approach this. I made an appointment with a dietitian; and they called me back saying they don’t even do blood work and that I should see my primary care physician. I don’t have one and I don’t want a one whose against alternative therapies. If anyone has some suggestions in or outside nyc, I’d greatly appreciate it.