Convert ratio into mg per mL expression
3. Percent, Ratio, mg/mL, PPM, PPB 3.2) Ratio 3.2.1) Ratio - General
3.2.1.1) Ratio - General Normal 1
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A medication is expressed as 1 : 990. Express this in mg/mL strength
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lb equals 1.01 mg/mL kg
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1 : 990 means, 1 g of drug is present in each 990 mL of the solution.
First, determine the gram amount of drug present per 1 mL of the solution. Then, the gram will be changed to mg. `therefore (1 \quad g)/(990 \quad mL)=x/(1 \quad mL) therefore x = 1/990 ` g.
Now, convert this gram unit into mg unit:
`(1000\quad mg)/(1\quad g) = y/(1/990\quad g)`
`therefore y = 1.01` mg.
`therefore 1.01` mg/mL is the answer.