Platelet counts, MPV, and platelet morphology in COVID-19 patients are normal. (A) Platelet counts and (B) MPV are represented from COVID-19 non-ICU (red, n = 17) and ICU (blue, n = 12) patients. The reference range provided by ARUP is below the figure and represented by the shaded region. (C) TPO levels were measured by enzyme-linked immunosorbent assay (ELISA) in healthy donors (n = 7) and COVID-19 patients (non-ICU, n = 15; ICU, n = 14,). Blue dots indicate ICU patients whereas red dots indicate non-ICU patients. (D) Platelets were isolated from healthy donors (n = 4; HD; top panel) and COVID-19 patients (n = 4; COVID-19; bottom panel) and adhered to Acylar coated with poly-lysine and imaged with a JEOL JEM-1011 electron microscope. Digital images were captured with a side-mounted Advantage HR CCD camera. Lower power magnifications are provided on the left with representative images from 2 separate donors or patients on the right at a higher magnification. Scale bars: black bars = 1 μm; white bars = 0.5 μm. *P < .05. K/uL indicates ×10³/μL.