OBJECTIVES: The objective of this analysis is to study the relationship between the Health Assessment Questionnaire (HAQ) and utility value in Rheumatoid Arthritis (RA) patients. METHODS: Studies regarding the severity of RA and utility value were performed on RA patients. RA severity and utility value were measured by using the HAQ and the EQ-5D, respectively. SPSS11.5 was used for statistical analysis. RESULTS: The final sample size included 307 patients. The sex distribution of RA patients was 86.3% females. Patientsf mean age, mean age of RA onset and mean RA duration were, 61.0 years, 44.3 years and 16.6 years, respectively. The mean utility values of RA patients obtained from the HAQ and EQ-5D were 0.83 and 0.60, respectively. Regression analysis using the HAQ as the independent variable and the utility level as the dependent variable was performed. The resulting regression equation was utility=- 0.17 x HAQ + 0.74iR2=0.45j CONCLUSIONS: The utility values obtained from the HAQ and EQ-5D were negatively correlated. R2=0.45 in the estimated regression equation. The resulting regression equation may therefore be effective in estimating utility value with the HAQ.