Our findings revealed that plasma C3 levels are positively correlated with hematoma volume (r = 0.279, p < 0.05) and the NIHSS score (r = 0.42, p < 0.0001), but are negatively correlated with the GCS score (r = −0.453, p < 0.0001) after ICH (Figure 2). The gene discussed is C3; the disease is hematoma.