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Objective: To evaluate QoL in a sample of Brazilian patients with Gaucher (GD) and Fabry (FD) disease using the SF-36 survey., Method: Observational cross-sectional study. The SF-36 survey was administered to cognitively able patients 12 years or older, who were seen in the Medical Genetics Service of Hospital de Clínicas de Porto Alegre, Brazil., Results: Thirty-five patients were included in the study (GD = 21, FD = 14), mean age was 29.8 ± 14.2 years and 29 (82.9%) were receiving ERT. Patients with GD receiving ERT had better scores in the general health (p = 0.046) domain of the SF-36 than patients with FD receiving ERT. Comparison of patients with GD naive to ERT and those receiving ERT revealed differences only in the bodily pain domain (p = 0.036). The Zimran score showed a moderate negative correlation with the following domains of the SF-36: physical functioning (p = 0.035), role-physical (p = 0.036), general health (p = 0.023) and role emotional (p = 0.021)., Discussion and Conclusion: Although limited because of the small number of patients included, findings suggest that patients with GD receiving ERT have a better QoL than patients with FD or with GD not receiving ERT. Imiglucerase has a beneficial effect against pain for patients with GD. Further studies should be conducted to confirm our findings.