From survival analysis of proportional hazard model, we also found elevated CEA levels increased mortality of COVID-19 (HR = 1.023, 95% CI: 1.005–1.042), as well as age (HR = 1.050, 95% CI: 1.016–1.086) and ferritin levels (HR = 1.001, 95% CI: 1.001–1.002). Here, CEACAM5 is linked to COVID-19.