Problem: Jayden, a 50-year-old man who self-identifies as biracial, presents to his primary care physician for evaluation of his type 2 diabetes and CKD. He is currently taking metformin, which can be used safely when eGFR is 45 mL/min/1.73 m2 or higher. His current eGFR is 48 mL/min/1.73 m2, but his physician is not sure which equation is being used to generate this serum creatinine-based eGFR. To be sure to obtain the most accurate eGFR, what is the best approach? Need Professional Help?