Convert ratio into mg per mL expression

3. Percent, Ratio, mg/mL, PPM, PPB 3.3) mg/mL 3.3.1) mg per mL - General

3.3.1.1) mg per mL - General Normal 1


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A medication is expressed as 1 : 820. Express this in mg/mL strength


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lb equals 1.22 mg/mL kg

    1 : 820 means, 1 g of drug is present in each 820 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)/(820 \quad mL)=x/(1 \quad mL) therefore x = 1/820 ` g.

    Now, convert this gram unit into mg unit:
    `(1000\quad mg)/(1\quad g) = y/(1/820\quad g)`
    `therefore y = 1.22` mg.
    `therefore 1.22` mg/mL is the answer.