As Nephrologist, a practitioner will assess and diagnose diseases of the kidneys. While many people know that the kidneys remove waste products from the body, many don’t know that they also release hormones that regulate blood pressure, control the production of red blood cells, balance the bodies fluids, and produce an active form of vitamin D that promotes strong, healthy bones. That means that the kidneys have an impact on every other system in our bodies. If they aren’t doing their job, the effects can be felt through out the body.