What Happens to GFR During Dehydration?

By Staff WriterLast Updated Apr 10, 2020 12:08:24 AM ET

During severe dehydration, because blood pressure lowers and kidney function is reduced, the glomerular filtration rate (GFR), declines. When rehydration occurs, GFR normalizes, unless there has been some kidney damage. Mild dehydration normally does not affect GFR.