So I'm trying to take this whole thing a bit more seriously and I want to get a few tests done, namely a Lactose Tolerance Test to test for SIBO and a hopefully Arginine/GHRH tolerance test to test for Growth Hormone Deficiency. I checked with insurance and "They do not require prior authorization if performed as outpatient at an in network facility by in network physician". I do not know how to go about this. I also checked the CPT codes for Quest Diagnostics. Does this same test transfer between different companies who might do it? Or can I go in to Quest and get these kind of outpatient tests there? I've only ever gone there for blood draws. My GP is about 2 hours away and will probably write me an order for anything I want, but how do I go about this? Do I call my office and have her send that request to a hospital in my area? I'm familiar with getting a lab order and going to Quest Diagnostics for blood work but I've never had to deal with this kind of thing. It also has to be in network stuff. Will my Dr's office be able to determine who is in network? Sorry if this is common knowledge stuff, I'm not sure where to get this information from.