![]() The definitions for the severity of illness categories also apply to pregnant patients. ![]() Although inflammatory markers such as C-reactive protein (CRP), D-dimer, and ferritin are not routinely measured as part of standard care, results from such measurements may have prognostic value. Laboratory testing should include a complete blood count with differential and a metabolic profile, including liver and renal function tests. The initial evaluation for patients may include chest imaging (e.g., X-ray, ultrasound or computed tomography scan) and an electrocardiogram. 1 Health care providers should closely monitor patients with these conditions until they achieve clinical recovery. Other underlying conditions associated with a higher risk of severe COVID-19 include asthma, cancer, cardiovascular disease, chronic kidney disease, chronic liver disease, chronic lung disease, diabetes, advanced or untreated HIV infection, obesity, pregnancy, cigarette smoking, and being a recipient of immunosuppressive therapy or a transplant. Patients who are aged ≥65 years are at a higher risk of progressing to severe COVID-19. Clinicians who use SpO 2 when assessing a patient must be aware of those limitations and conduct the assessment in the context of that patient’s clinical status. However, pulse oximetry has important limitations (discussed in more detail below). SpO 2 is a key parameter for defining the illness categories listed above.
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