Fig. 4
From: Correlating COVID-19 severity with biomarker profiles and patient prognosis
Study design for Long COVID questionnaire. Methods: 1. Recruitment of outpatient volunteers and after hospital discharge for a period of 1 year. 2. Stages of venous blood collection, sample processing, storage at – 80 °C, questionnaire application, and informed consent form signing. 3. DNA extraction stage, laboratory analyses, and molecular assays. 4. Recall of participants with altered results after 6 months from the first collection. 45% return rate. 5. Remote application of the questionnaire dedicated to LC. Long COVID Questionnaire: 6. The musculoskeletal system (joint pain, myalgia, and fatigue) was evaluated. 7. Cardiovascular system (chest pain, palpitations, dyspnea, and dry cough) 8. Vascular system (phlebitis, swelling, and cramps). 9. Evaluation of the EURO-QOL-5 Dimension questionnaire.
