In article c0bvf.6904$JT.3204@fed1read06, Steve B says...

If you suspect you or someone is affected, look at their nails. Cyanosis,
bluing of nailbeds and lips, is a sign.

Interestingly this is absolutely untrue.

CO poisioning exhibits itself as nail beds, lips, etc as being
bright cherry red.

Carboxyhemolglogin is every bit as red as the oxygenated
variety - even more so.

In fact this is a strong indicator of CO exposure.

Jim


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