Mass/Liquid For Liquid Questions

Given an amount of mass per liquid, how much liquid do you require?

Formula:

Ordered Have

x Volume Per Have

=  Y (Liquid Required)

Example: Phenytoin (Dilantin), 0.1 g PO, is ordered to be given through a nasogastric tube. Phenytoin is available as 30 mg / 5 mL. How much would the nurse administer?

Ordered Have

x Volume Per Have

=  Y (Liquid Required)

Convert 0.1 g to mg.

• mcg ← mg ← g ← kg    ( x by 1,000 )
• 0.1 g x 1,000 = 100 mg

100 mg 30 mg

x 5 mL

=  16.7 mL

Example: Ordered Lasix 40 mg IV push now. Available: 80 mg in 1 mL. How much will the nurse draw up?

Ordered Have

x Volume Per Have

=  Y (Liquid Required)

40 mg 80 mg

x 1 mL

=  0.5 mL

• Continue (Go to IV Terms and Abbreviations)