This study aimed to test the relationship of the Modified Stanford Health Assessment Questionnaire (MHAQ) for assessment of physical disability as compared to a set of function tests in rheumatoid arthritis (RA). Fifty RA patients with mean age of 39 years and median disease duration of five years were included in this study. The patients completed the MHAQ. Four simple function tests were performed (walk test, chair test, upper extremity mobility test and grip strength test) and a Modified Larsen score was established. Mean Grade Disease Activity (MGDA) and laboratory variables for inflammation were recorded. The results showed that MHAQ, simple function tests, Modified Larsen score and C reactive protein (CRP) correlated significantly (P<0.01). However, MHAQ did not correlate with erythrocyte sedimentation rate (ESR) (P = 0.078). In our study, we found a highly significant correlation between the score of MHAQ and Modified Larsen score (P = 0.002). The four simple function tests used in this study also significantly correlated with radiological joint damage especially after disease duration of five years. Therefore, we can conclude that there was no significant difference between MHAQ and simple function tests as regards their correlation with radiological joint damage in RA patients.