Question

lpn 101 dosage calculation exam 1

1. order: codeine 30 mg po

available: 15 mg/5 ml. how many ml?

1. order: antacid 1,200 mg po

available: 400 mg/5 ml. how many ml?

1. order: heparin 5,000 units sq

available: 10,000 units/ml. how many ml? round to the nearest tenth.

1. order: insulin lispro 12 units sq

available: 100 units/ml. how many ml? round to the nearest tenth.

1. order: morphine 4 mg im

available: 10 mg/ml. how many ml? round to the nearest tenth.

1. order: calcium carbonate 1.5 g po daily, tablets available: 500 mg.

how many tablets?

1. a patient needs 0.375 mg digoxin po. tablets available: 0.125 mg.

how many tablets?

Explanation:

Step1: Set up dosage formula

$\text{Volume (mL)} = \frac{\text{Ordered Dose}}{\text{Dose per mL}}$

Step2: Calculate for Q7

Ordered dose = 30 mg, Dose per mL = $\frac{15\ \text{mg}}{5\ \text{mL}} = 3\ \text{mg/mL}$
$\text{Volume} = \frac{30}{3} = 10\ \text{mL}$

Step3: Calculate for Q8

Ordered dose = 1200 mg, Dose per mL = $\frac{400\ \text{mg}}{5\ \text{mL}} = 80\ \text{mg/mL}$
$\text{Volume} = \frac{1200}{80} = 15\ \text{mL}$

Step4: Calculate for Q9

Ordered dose = 5000 units, Dose per mL = 10000 units/mL
$\text{Volume} = \frac{5000}{10000} = 0.5\ \text{mL}$

Step5: Calculate for Q10

Ordered dose = 12 units, Dose per mL = 100 units/mL
$\text{Volume} = \frac{12}{100} = 0.12 \approx 0.1\ \text{mL}$

Step6: Calculate for Q11

Ordered dose = 4 mg, Dose per mL = 10 mg/mL
$\text{Volume} = \frac{4}{10} = 0.4\ \text{mL}$

Step7: Calculate for Q12

Convert units: $1.5\ \text{g} = 1500\ \text{mg}$
$\text{Tablets} = \frac{1500}{500} = 3$

Step8: Calculate for Q13

$\text{Tablets} = \frac{0.375}{0.125} = 3$

Answer:

1. 10 mL
2. 15 mL
3. 0.5 mL
4. 0.1 mL
5. 0.4 mL
6. 3 tablets
7. 3 tablets