On admission, laboratory studies including complete blood count (CBC), complete metabolic panel (CMP), prothrombin (PT), activated prothrombin time (aPTT), lipids, thyroid-stimulating hormone (TSH), coronavirus disease 2019 (COVID-19) polymerase chain reaction (PCR) screen and toxicology screen were unremarkable. During his hospital stay, the only medication that he received was enoxaparin 40 mg subcutaneous injection daily for deep vein thrombosis prophylaxis. Here, F2 is linked to deep vein thrombosis.