COVID-19 not just lung disease, can also cause lethal blood clots: Experts The prevalence of blood clot formation in COVID-19 is high in patients with conditions such as type-2 Diabetes Mellitus, said Dr Ambarish Satwik, vascular and endovascular surgeon at Delhi's Sir Ganga Ram Hospital PTI | May 8, 2021 | Updated 10:42 IST There is increasing evidence to suggest that COVID-19 is not just a disease of the lungs as initially thought but can also cause dangerous blood clots which need to be immediately removed to save limbs in some cases, say experts. Global studies have shown that the prevalence of blood clot formation known as deep vein thrombosis (DVT) in hospitalised COVID-19 patients is 14-28 per cent and is a lower 2-5 per cent for arterial thrombosis.