ObjectiveAs a healthârelated quality of life (HRQOL) measure, the LupusQoL is a reliable and valid measure for adults with systemic lupus erythematosus (SLE). This study evaluates the responsiveness and minimal important differences (MIDs) for the 8 LupusQoL domains.MethodsPatients experiencing a flare were recruited from 9 UK centers. At each of the 10 monthly visits, HRQOL (LupusQoL, Short Form 36 health survey [SFâ36]), global rating of change (GRC), and disease activity using the British Isles Lupus Assessment Group 2004 index were assessed. The responsiveness of the LupusQoL and the SFâ36 was evaluated primarily when patients reported an improvement or deterioration on the GRC scale and additionally with changes in physicianâreported disease activity. MIDs were estimated as mean changes when minimal change was reported on the GRC scale.ResultsA total of 101 patients were recruited. For all LupusQoL domains, mean HRQOL worsened when patients reported deterioration and improved when patients reported an improvement in GRC; SFâ36 domains showed comparable responsiveness. Improvement in some domains of the LupusQoL/SFâ36 was observed with a decrease in disease activity, but when disease activity worsened, there was no significant change. LupusQoL MID estimates for deterioration ranged from â2.4 to â8.7, and for improvement from 3.5 to 7.3; for the SFâ36, the same MID estimates were â2.0 to â11.1 and 2.8 to 10.9, respectively.ConclusionAll LupusQoL domains are sensitive to change with patientâreported deterioration or improvement in health status. For disease activity, some LupusQoL domains showed responsiveness when there was improvement but none for deterioration. LupusQoL items were derived from SLE patients and provide the advantage of diseaseâspecific domains, important to the patients, not captured by the SFâ36.