And some people have to take medication right away to get blood sugar down to safe levels.

For that reason, most media reports call this the "safe" level of exposure.

Recent medical research has found no known safe level for lead exposure.

As a result, the sugar in your blood rises above a safe level.

"That is a safe level for a one in a million cancer risk."

"There is no such thing as a safe level of radio- activity," he said.

Your doctor can suggest a safe level of exercise for you.

Questions have also been raised about the department's response to outside advice and its ability to determine a safe level of operation.

Lead readings in his blood were more than twice the safe level.

One part per billion is now considered a safe level.