Dose Calculation - 服用量の計算 -


Sam: Hi, Jenny. How was your home visit with Mr. Drew?
Jenny: Hi, Sam.  It was fine.  He's doing much better now.
Sam: That's good news. By the way can I ask you a favor?
Jenny: Sure.   What is it? 
Sam: I have to calculate the rate of the intravenous infusion. I need to know how many hours it will take for the patient to receive his full dose of medication.
Jenny: Let’s see. The doctor ordered an IV infusion of a full dose of a hundred milligrams with a flow rate of 10 mg per hour. What is the concentration of the intravenous medication you have?
Sam: I have a 50 mL intravenous infusion bottle with a concentration of 10 mg per 5 mL. 
Jenny: We can use the conversion factor to get the correct number of hours. First, we need to convert mL to mg and then mg to hours.  So, multiply 50 mL by 10 mg and divide by 5 mL. That equals a 100 mg. Next, a 100 mg multiply by 1 hour equals a 100 mg per hour. Divide that by 10 mg, and the result is 10 hours. 
Sam: Thank you. Can I try?
Jenny: Sure. 

Think about it

  1. What’s Sam doing?
  2. How did Jenny solve the problem?
  3. Are you good in mathematics?

Let's Practice

Practice the dialogue with your teacher.

You and your teacher are pharmacists.


  Medical Terms Words/Phrases
Nouns intravenous / IV infusion /flow rate / mL / mg 
Verbs   calculate /convert
Others   conversion factor

第1問 : 配点1 How is Mr. Drew?
1:He’s not doing very well.
2:He is still sick in bed in a hospital.
3:He’s getting much better.,

第2問 : 配点1 What does Sam ask Jenny?
1:He asked her to check his own medical record.
2: He asked her how to calculate the rate of intravenous infusion.
3:He asked her to say hello to Mr. Drew.,

第3問 : 配点1 What can we use to get the correct number of hours?
1:safety factor
2:conversion factor
3:common factor,

第4問 : 配点1 As a result, how many hours will take for the patient to receive his full dose of medication?
1:10 hours
2:50 hours
3:5 hours,

第5問 : 配点1 What amount of intravenous medication does John have?