Pooled data fr diff SLE cohorts by Dr SGarg et al were evaluated to determine an upper threshold tx range of HCQ 750-1150 ng/mL: safe & effective HCQ levels >1150ng/mL-supratx, no added tx benefit CKD st >/=3: 2x ⬆️odds of toxic hcq levels #ACR25 @RheumNow Abs1722 #ACRBest https://t.co/RFx1VO0bov