As a good nerd I bought my pulse oximeter in early days, but I (a) know that I've had poor measured blood oxygenation since at least my mid-20s, (b) have no idea how bad that actually is, either under the threat of COVID or generally & (c) have no idea how to interpret my #'s now
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From there, you’re equipped to ask “how unusual is this measure from my baseline” if you *do* suspect something in the future. But you should still get some medical input on why your baseline SpO2 is low. That may affect your risk level and inform behaviour change.
When I became aware of the issue it was "who knows?" I'm a former smoker. Normal weight. No known chronic illnesses. Struggle with cardiovascular exercise, which is probably to be expected. Nobody was going to order any additional tests then and I'm *certain* they won't now 
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You’re may be right about additional tests. But a call with a doctor might offer you new information in the context of Covid-19. My (uninformed) suspicion is that someone with lower baseline sats would be at higher risk. (But I’m not a doctor so I’m not giving advice.)
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