A 135 pound patient is to receive a medication dose of 0.5 mg per kg of body mass. The medication is available in 120 mg/ml. How many ml of medication should the patient receive?
135 lb x 1kg/2.2lb x .5 mg/kg / 120 mg/ml = 0.256 ml
135 lbs x 0.45359237 kg / 1 lb x 0.5 mg / kg x ml /120 mg ≈ 0.255 ml
+12 
