When my CKD GFR dropped from 45 to 36 I began to see horizontal ridges on my thumbnail (unlike the usual vertical ridges that go up and down).
I remember seeing a traditional Chinese doctor once who checked my nails. These horizontal ridges are still appearing although a follow a good diet.
I check them now and then as I feel it shows the amount of CKD that i have.
Has anyone had a similar experience?