In relation to laboratory analysis, among the different tests requested from patients admitted to our service, lymphopenia (768.4 ± 340.4; p < 0.001), elevation in Cr (1.73 ± 1.68; p = 0.009), increase in troponin (18.7 ± 26.9; p = 0.018), and increase in complement C4 (52.4 ± 12.6; p = 0.04) were shown to be statistically significant as predictors of a worse prognosis. The gene discussed is C4A; the disease is lymphopenia.