Failure to detect elevated levels of carboxyhemoglobin in infants dying from SIDS.

Carboxyhemoglobin (COHb) levels were determined in stored blood samples from 91 infants diagnosed to have died from the sudden infant death syndrome (SIDS) (0.59 ′ 0.41%, excluding one outlying value of 10.83%); 48 age-matched controls (0.53 ′ 0.38%); and three individuals who died from fire related causes (41 ′ 20%). No statistical differences in COHb levels were detected between blood from SIDS and control infants (p = 0.43).