While saturating briefly <94% is certainly underwhelming under most clinical circumstances, it is one of the criteria for severe covid. Moreover, only those with severe disease qualify for treatment with remdesivir and dexamethasone. The CDC references the NIH guidelines for both
treatment and
disease classification. Here is an excerpt from the latter addressing disease severity:
We know Trump required supplemental oxygen, but don’t know his nadir saturation, nor the duration of hypoxia. His doctor suggested somewhere in the mid- to high 80’s when he said something along the lines of “not in the low 80’s”, but I can’t find any specific number quoted lower than 93% - less than 94 regardless. So by the letter of the law, he had severe disease.
Of course there are caveats:
1. Trump clearly received treatment outside the standard of care.
2. Brief desaturation is very common, and of questionable clinical significance. It’s certainly possible the oximeter reading was a poor waveform/spurious. Alternatively, Trump may have sleep apnea, obesity hypoventillation or other undiagnosed cardiopulmonary condition with lower than average baseline saturations.
3. The information we have been given is limited and of questionable veracity. Particularly concerning are omissions regarding timing of testing, chest x-ray findings and the extent/duration of hypoxia.
Even given the above limitations, my impression is Trump has/had severe covid-19, and therefore should be subject to 20 days isolation after symptoms’ onset, provided he’s been afebrile 24 hours and other symptoms are improving. As
@gianmarco pointed out, he’s planning a rally less than 10 days after symptom onset, so clearly he’s ignoring the guidelines.