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I've had a lot of delays of scheduled infusions, never for kidney problems, but for low red and white cell counts. My infusions were every three weeks and I once skipped two infusion cycles. My doc told me that the two-cycle delay should not adversely affect my treatment. I was declared NED after the infusion course was complete so the delay likely had no effect on my treatment.
I don't know enough about kidney function and chemotherapy to give you insight. So, I wouldn't know about a wall.
Relying on old labs during a consultation seems odd. That never happened to me. It might be a problem with the practice administration not loading the labs into the medical record. Most records are computerized these days and one would think information technology would solve a problem like chronological ordering of labs.
I agree with FLgirl in drinking water. That was something my chemo nurse told me - drinking lots of water 2 or 3 days prior to the infusion. I am not sure I can remember the reason but I did consume lots of water.
Stay the course.
My husband was getting Carboplatin once every 21 days and nab-paxalataxil every week for 4 cycles at 21 days per cycle. He ended up with something in a kidney but not sure what. They wanted to wait until the chemo was over to check it out. Thanks for the reminder because he has been off chemo for over a month. I hope your Dad gets better soon. Check around and see what may help him support his kidneys getting better like whether or not to drink lots of water or if anything might have a cleansing effect... I just don't know but thinking out of the box so your not just in the waiting game without feeling like something is being done.
He is lucky to have you looking out for him.