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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Renal GFR is best measured by –
assistant
The correct answer is  Inulin clearance is the gold standard for assessing GFR. It is the preferred measure of GFR when an accurate measure is critical. However, this method is not performed in clinical practice, because of technical complexity and limited availability.
Next to inulin, radiocontrast agents (Tc - DTPA) are most accurate.
However, because of its convenience and low cost, creatinine clearance is most commonly used.