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Arch Pathol Lab Med ; 146(1): 26-33, 2022 01 01.
Article in English | MEDLINE | ID: mdl-34543379

ABSTRACT

CONTEXT.­: The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a highly infectious agent, with the propensity to cause severe illness. While vaccine uptake has been increasing in recent months, many regions remain at risk of significant coronavirus disease 19 (COVID-19)-related health care burden. Health systems will continue to benefit from the availability of a variety of clinical and laboratory models when other triaging models are equivocal. OBJECTIVE.­: To validate previously reported clinical laboratory abnormalities seen in COVID-19 patients and identify what laboratory parameters might be outcome predictive. DESIGN.­: We undertook an observational study of hospital-admitted COVID-19 patients (n = 113), looking at a broad selection of clinical, laboratory, peripheral blood smear, and outcome data during discrete discovery and validation periods from March 2020 to November 2020. RESULTS.­: We confirmed the findings of previous studies noting derangement of a variety of laboratory parameters in COVID-19 patients, including peripheral blood morphologic changes. We also devised a simple-to-use decision tree by which patients could be risk stratified on the basis of red blood cell count, creatinine, urea, and atypical plasmacytoid lymphocyte ("covidocyte") count. This outcome classifier performed comparably to the World Health Organization clinical classifier and the neutrophil-lymphocyte ratio. CONCLUSIONS.­: Our data add to the increasing number of studies cataloguing laboratory changes in COVID-19 and support the clinical utility of incorporating blood morphologic assessment in the workup of hospitalized COVID-19 patients.


Subject(s)
COVID-19 , SARS-CoV-2 , Humans , Laboratories , Laboratories, Clinical , Risk Assessment
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