American Thoracic Society Documents 401 Figure 2. Algorithm forinitiating empiric antibi-otic therapy for hospital-acquired pneumonia (HAP),ventilator-associated pneu-monia (VAP), and health-care-associatedpneumonia(HCAP). Figure 2.
One milligram is one thousandth of a gram and one thousand micrograms. A milligram is generally abbreviated as mg. MICROGRAM. One microgram is one millionth of a gram and one thousandth of a milligram. It is usually abbreviated as mcg or ug. Mcg and ug are the same.
Micrograms. A microgram -- mcg -- is an extremely small unit of measurement equal to one-millionth of 1 g or one-thousandth of 1 mg. For example, the average adult needs 15 mcg of vitamin D daily. This is equal to 0.015 mg and 0.000015 g. microgram -- mcg -- is an extremely small unit of measurement equal to one-millionth of 1 g or one-thousandth of 1 mg. For example, the average adult needs 15 mcg of vitamin D daily. This is equal to 0.015 mg and 0.000015 g.