Neurology visit/ HRV

Visited a Neurologist a few weeks ago and was blown away by the fact that neither the doctor nor nurse knew what HRV is. The nurse kept asking me well who diagnosed you with HRV… am I crazy or is it insane to go to a neurologist who doesn’t even what that is. They wanted to argue with me that it’s not related to the CNS and doesn’t matter when they didn’t even know what it is. Kinda felt like a weird stance/ hill to die on.

I understand it’s just a metic and has no set scale for what is a healthy HRV and there’s no HRV that says oh you have this disease etc. But i just feel like im not going to be getting the best care possible when a neurologist doesn’t know what it is. HRV is controlled by the autonomic nervous system, which is clearly apart of the central nervous system. It just blows my mind that they have no concept of it even though it wouldn’t directly tell them what is wrong.

Wouldn’t want to hire a mechanic for basically anything who can’t change a tire or doesn’t know about Freon for ac. Yea those aren’t my car problems but you’re a specialist and should know the ins and out of your field. At least a general idea. Not the best example but you get the idea.

Am I going crazy?