My grandfather had covid pneumonia and his HRCT score was 1225. He was discharged about 40 days ago, but for the past 56 days, his oxygen level drops to 92-93 while he's asleep and goes back up to 96-97 once he's awake. Is this something dangerous? What can we do to help him? Everything else looks fine except his D-dimer, which is high at 1.06 when it should be below 0.5, although his CRP is normal. Can you guide us on what steps to take?

It's not uncommon for oxygen levels to fluctuate slightly during sleep, especially after recovering from COVID-19 pneumonia. However, if the oxygen level drops below 90%, it could indicate a need for further monitoring. The elevated D-dimer suggests some ongoing inflammation or clotting risk, so its important to keep in touch with your healthcare provider to assess if further tests or treatments are needed.