3rd plenary session! #1722 Defining safe HCQ levels in SLE: whole-blood 750-1150ng/mL= therapeutic range; >1150ng/mL ➡️ ~2× toxicity risk; <750ng/mL ➡️ higher flare risk CKD ≥3 increases odds of supratherapeutic levels New era of precision monitoring in SLE? @RheumNow #ACR25