Does fat freezing and CoolSculpting affect kidney function?

Thanks for your question and I appreciate your concern. CoolSculpting is a non-invasive procedure that should not cause any problems with your kidney condition. Clinical trials were performed that analyzed blood work before and after Coolsculpting treatment that did not show any worsening kidney function. However, make sure you are working with a board-certified dermatologist who is well-versed on your medical history to ensure your procedure is as safe as it is successful.

A CoolSculpting treatment on the abdomen and love handles (or anywhere else on the body) should not affect kidney function, so I would see no problem treating you even though you had nephritis as a child.  

Your history of nephritis as a child should not have an impact on the CoolSculpting treatment and the resultant fat destruction and metabolism.
Be Well
Dr Gerrish