Can't help you on the hair question since I've lost most of mine.
The blood testing may depend on your insurance coverage. For example, I have Tricare Standard (retired military) so I don't need any referrals. If I know I need something in a particular town, I'll check the website for participating doctors in that area and call well in advance. When I was married my DW needed monthly transfusions so our travel itinerary was dictated by availability of a nearby transfusion center.
Joe, Mary and Dakota, the wacko cat
Fulltiming since 2006
2006 Dodge 3500 QC CTD SRW Jacobs Exhaust brake
2017 Open Range 3X388RKS, side porch