Lack of apparent relationship between measured carboxyhemoglobin concentration (percent) and outcome of human fetal CO exposure. Data in this series came from the literature and is summarized in table 1 from the source below. It should be noted that some fetuses/newborns were reported normal, even after exposure to very high COHb levels; whereas, many fetuses/newborns died or were reported abnormal after exposure to quite low COHb levels.

From: Bailey, B. (2001) "Carbon monoxide poisoning during pregnancy", Chapter 15, pgs. 257-268, In: Maternal-Fetal Toxicology: A Clinician's Guide, 3rd. ed., edited by G. Koren.