This article is a systematic review of multiple articles which examine the use of multiple biomarkers. High CRP and d-dimer are associated with increased mortality. Also, a decline in platelets is also associted with increased mortality.
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Kermali, Muhammad, Raveena Kaur Khalsa, Kiran Pillai, Zahra Ismail, Amer Harky. “The role of biomarkers in diagnosis of COVID-19 – A systematic review." Life Sciences 254, (2020). https://doi.org/10.1016/j.lfs.2020.117788