Simple Disease Activity Index (SDAI)
Sum of joint counts, patient/physician globals (0–10 each), and CRP in mg/dL.
Calculator
How it works
SDAI is a simple additive RA index including CRP on the mg/dL scale (Smolen et al.; published reference).
Limits
CRP must be in mg/dL (not mg/L); confirm laboratory units before interpreting.
Educational tool only—not for diagnosis or treatment decisions.