Amber's itching and kidney failure

I'm super curious if her doctor is checking phosphorus.

I was an in center dialysis, acute dialysis, and PD/HH nurse for 6 years.

First thing I thought was, what's her phosphorus? The thing about kidney failure is people will say I was a little more tired than usual, and then one day, it's the worst they've felt in their lives because their kidneys couldn't compensate anymore.

Curious if they tested her.