The considered "safe" blood lead has been lowered by increments of 10 through the years and until just recently, a level below 10 micrograms per deciliter
was deemed safe and required no discussion or treatment.
Conclusions: Blood lead concentrations, even those below 10 [micro]g per deciliter
, are inversely associated with children's IQ scores at three and five years of age, and associated declines in IQ are greater at these concentrations than at higher concentrations.
In addition, there was an average difference of 8.5 milligrams per deciliter
in total cholesterol levels and 5.8 milligrams per deciliter
in LDL cholesterol levels between the one-fifth of participants with the highest and lowest PFOS levels.
Furthermore, people at the top end of that risk category, those with at least a 20 percent estimated chance of having a heart attack within a decade, should reduce their LDL to no more than 100 milligrams per deciliter
(mg/dl) and, at their doctors' discretion, to 70 mg/dl or less.
In October 1991 the Centers for Disease Control (CDC) lowered the permissible limit on blood lead levels to 10 micrograms per deciliter
of whole blood (ug/dl).
Centers for Disease Control and Prevention (CDC) reduced the lead level "of concern" for children from 30 micrograms to 10 micrograms per deciliter
of blood, but the suggest that even levels below 10 present a health risk, providing the first evidence that lead levels that low may impair kidney function.
Men in the highest exposure group (8.17-35.0 micrograms per deciliter
) had 2.5 times the risk of having cataract as the men in the lowest exposure group (1.0-3.0 micrograms per deciliter
The CDC defines an elevated level as being at least 10 micrograms per deciliter
Their HDL scores rose even higher after they took torcetrapib twice a day--more than doubling from an average of 34 milligrams per deciliter
of blood after taking only the inert pill to 70 mg/dl.
Results of city-wide lead tests give only some indication of the level of contamination in area youngsters because in October of 1991, the level of contamination was lowered to a finding of 10 micrograms per deciliter
The results showed that decrements in nerve function--a precursor to neuropathy--were limited to large and small myelinated sensory nerve fibers, with a threshold effect at a TWA of 28 micrograms per deciliter
. At higher levels of lead exposure and presence of ergonomic stress, nerve fibers were more susceptible to increased damage, something that has never before been shown in human studies.
Patients entered the study with an average LDL concentration of 106 milligrams per deciliter