Relevant biochemical alterations were noticed, especially in the hypertensive patients with a previous diagnosis of COVID-19 (HCP group): LDH (lactate dehydrogenase) (25%), glucose (75%), and CRP (C-reactive protein) (55%), while the HCN group presented a limited number of patients with those alterations: 5.8, 35 and 23.5%, respectively. Here, CRP is linked to COVID-19.