OBJECTIVE: To establish the effectiveness threshold of mycophenolic acid-area under the concentration-time curve between 0 h and 12 h (MPA-AUC METHODS: This observational cohort study enrolled 48 pediatric LN patients treated with mycophenolate mofetil (MMF), tacrolimus, and prednisone. MPA-AUC RESULTS: To achieve renal remission, the MPA-AUC CONCLUSION: There is a significant correlation between MPA-AUC