FCER1A and systemic lupus erythematosus: Serum FcεRIα: 3.52 (2.18, 4.71) μg/ml in SLE patient group was significantly higher than that in healthy control group: 1.87 (1.52, 2.33) μg/ml; serum anti‐IgE antibody level in SLE patient group: 0.85 (0.55, 1.21) μg/ml was significantly lower than that in healthy control group: 1.23 (0.95, 1.58) μg/ml (p = .000; Figure 1).