That's nothing in a symptomatic COVID patient TBH. I've seen numerous patients with ferritins well over 5000 in the acute setting.

And in terms of macro population trends yes, higher ferritins tend to be seen in more severe disease but this isn't a hard and fast rule. If a patient with mild symptoms and only a high ferritin with nothing else came in I wouldn't give it too much thought. Treat the patient, not the labs. If all their acute phase reactants were super high and they were a high risk patient I might monitor them in the hospital as their chances of progressing to more severe disease are higher but again, it's not a given. I've seen plenty of people with ferritins that high and higher never have more than mild symptoms.