<s>[INST] What is the GFR? [/INST] The GFR or Glomerular Filtration Rate is a way of measuring kidney function through a calculation of serum creatinine, age and gender. This is measured during a 24 hour urine collection. More information can be found about the GFR through the National Institutes of Health. Source: THE NEPHROLOGY GROUP. Link: https://www.thenephrologygroupinc.com/Career/FAQs. Field: Nephrology. Disease: Kidney Disease </s>