Taking into account the rule of three, the nurse should administer 0.4166 mL per dose.
<h3>Rule of three</h3>
The rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
If the relationship between the magnitudes is direct, the direct rule of three must be applied as follow, being a, b and c known data and x the variable to be calculated:
a ⇒ b
c ⇒ x
So: x= (c×b)÷ a
<h3>Volume the nurse administers per dose</h3>
A nurse prepares to administer 250 mg (or 0.25 g, being 1 mg equal to 0.001 g) of an antibiotic, available at 3 g/5 mL.
Then, the following rule of three applies: if 3 g are contained in 5 mL, 0.25 g is contained in how much volume?
3 g ⇒ 5 mL
0.25 g ⇒ x
So: x= (0.25 g× 5 mL)÷ 3 g
Solving:
<u><em>x= 0.4166 mL</em></u>
Finally, the nurse should administer 0.4166 mL per dose.
Learn more with this example:
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