Feeling a child's forehead is unreliable for determining the presence of a fever.

This property is used to determine the presence of boron in qualitative analysis.

There were no instruments on board with which to determine the presence of an atmosphere.

To determine the presence of streptococcus bacteria, your doctor will do a throat culture.

Initially, the Roche test is to be used to determine the presence of anthrax in a letter or a building.

This analysis might have been able to determine the presence of volatile compounds, such as water.

No longer would the patient and doctor have to wait on lab results to determine the presence of foreign bodies.

The only way to determine the presence of lead in paint is to have the paint tested.

A mind which could determine the presence of energy or mass if it was large or dense enough.

Conventional urine tests can generally determine the presence of drugs only for a limited period.