What does the medical abbreviation gfr non black mean?

The medical abbreviation "GFR non black" refers to the estimated glomerular filtration rate (GFR) of a patient who is not of African descent. GFR is a measure of how well the kidneys are functioning and is calculated using a formula that takes into account the patient's age, gender, race, and serum creatinine level. The "non black" designation is used to indicate that the calculation was performed using a formula that is specific for patients who are not of African descent. This is because the GFR formula used for African American patients differs slightly from the formula used for non-African American patients.