Question

ordered: gemzar® 150 mg in 750 ml nss over 3h using 15 gtt/ml tubing
dosage available: gemzar® 200 mg/5 ml
(source: math and dosage calculations for healthcare professionals (booth, 5, isbn 1259166260) > chapter 15: intravenous calcula
a) calculate the mount to administer in ml per dose.

• your answer is incorrect.

part 2 of 3
b) calculate the flow rate in milliliters per hour.

• your answer is incorrect.

part 3 of 3
e number of drops per minute in gtt per minute.
try again
recheck

Explanation:

Part a)

Step1: Set up the proportion

We know that the dosage available is \(200\ mg/5\ mL\). Let \(x\) be the volume to be administered for \(150\ mg\). Using the proportion \(\frac{200\ mg}{5\ mL}=\frac{150\ mg}{x\ mL}\).
Cross - multiply: \(200x = 150\times5\).

Step2: Solve for \(x\)

\(200x=750\), then \(x=\frac{750}{200}=3.75\ mL\).

Part b)

Step1: Use the formula for flow rate

The formula for flow rate (\(mL/h\)) is \(\text{Flow rate}=\frac{\text{Volume}(mL)}{\text{Time}(h)}\).
Given the volume \(V = 750\ mL\) and time \(t = 3h\).

Step2: Calculate the flow rate

\(\text{Flow rate}=\frac{750}{3}=250\ mL/h\).

Answer:

a) \(3.75\ mL\)
b) \(250\ mL/h\)