To calculate the DAS28 you need four things:
- The number of tender joints of the 28 that are measured, (tender28)
- The number of swollen joints of the 28 that are measured, (swollen28)
- The Erythrocyte Sedimentation Rate (ESR), in mm/hour
- The patients’ general health (GH) or global disease activity measured on a Visual Analogue Scale (VAS) of 100 mm
In a soon to be available instruction video, you can see how to score the joints on swelling and pain.