A stage IV kidney disease is suspected in a lady with anaemia and progressive malnutrition. Which of the following renal parameters could be TRUE for her condition?
60-89 GFR, mL/min per 1.73 m2 30-59 GFR, mL/min per 1.73 m2 15-29 GFR, mL/min per 1.73 m2 < 15 GFR, mL/min per 1.73 m2