Abst#0788 #ACR21. Forgot to measure vitamin D? ▶️ Red cell distribution width (RDW) inversely correlates w vit D 25(OH) levels prior to MTX ⭐️ RDW ⬆️ after starting MTX, no longer correlates https://t.co/b5EPDmGE18 @Rheumnow https://t.co/cNN14ErOmF