Pneumonia suspected: A 'bad cold' could mean a number of things - but I worry in your case you might have some congestion in the lungs. You should get formal evaluation for this - a chest X-ray would be most helpful. "Just a cold" should NOT drop your oxygen levels like that. If you've measured them as significantly lower like this, you could have pneumonia. My differential includes CHF- so get checked out ASAP.
Answered 7/4/2016
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