Alligations: A Question about 1/3 Normal Saline Solution and Sterile Water for Injection

by Sherri
(Raleigh, NC)


A liter of 1/3 NS is to be prepared from 23.4% concentrated sodium chloride solution and sterile water for injection. How many milliliters of each are to be used?What is 1/3? Can you walk me through this?The book says the answers are 333 mL of NaCl and 667mL of water. I can't figure out how they get this answer or how to get it. Can you please post my problem on your website? If you can't answer my question, maybe one of your visitors can.

Comments for Alligations: A Question about 1/3 Normal Saline Solution and Sterile Water for Injection

Average Rating starstarstarstarstar

Click here to add your own comments

Rating
starstarstarstarstar
Here is the REAL answer to your question.
by: Anonymous

Okay Pharma techs...here it is

1/3 NS is 1/3 of NORMAL Saline. Normal saline is
0.9%. In order to do the problem you must find out how much 1/3 of normal saline is. So...
1/3 x 0.9 = 0.3%

0.9 is your high
0.3 is what you want
0 is the low because there is no saline in your diluent.

0.9 0.3
0.3
0 0.6
Total 0.9

0.3 x 1000mL 0.6 x 1000mL
--- = 333.3 --- =666.7
0.9 0.9

I hope this helps all the other people like me who struggled with this problem.

Rating
starstarstarstarstar
how do I set up tictactoe table (desired/on hand)
by: Anonymous

thanks for helping but you didn't tell me how to set up tic tac toe table (desired/on hand) using the 1/3 to obtain the 333 and 667?How do I set up ratio/proportion table ? I understand your reply to a certain extent but it was still sort of vague.Where do you get 1/2 from 1/3?I know you can use only distilled and sterile water.From what i've heard you calculate the water as 0%, I was trying to put .33 as 1/3 in tic tac toe table.Is there another percentage I should use/can use for 1/3?I apologize if this seems like a stupid question

Rating
starstarstarstarstar
Answer about 1/3 Normal Saline Solution and Sterile Water for Injection Question
by: Anonymous

I’m more than happy to help you answer your question on IV compounding. As a pharmacy tech, this is going to be an important formula for you to understand. So, we’ll work through this question together.

The first thing to understand is that NS stands for Normal Saline. This liquid will typically contain .9% mass volume. When delivering this solution intravenously, of the 1,000 mL that goes into the patient, about 250 mL will remain in their system during the course of an hour treatment.

Now, 1/3 NS means that the IV compounding is 1/3 normal saline. The problem is that based on how the question is supposed to be resolved, you will never end up with 333 mL of NaCl and 667mL of water. Those results would come from a 1/2 normal saline solution. This is the saline at .45% which is where the treatment fluid needs to be, in an effort to ensure proper therapy.

When a patient is given 1000 mL of a solution that is .45% NS, it will be the equivalent of providing them 500 mL of NS and 500 mL of standard water. This combination can then successfully help to treat a patient that has suffered from dehydration. The result would be 333 mL of NaCl in the intracellular fluid, while delivering a total of 667 mL of water fluid. The end being the full 1000 mL of solution, knowing the starting formulas is important in this case.

It will be important to look at the 23.4% concentrated sodium chloride solution. This is the common formulation of sodium chloride solution that you will find. For any concentrated solutions of sodium chloride you do need to ensure you are properly breaking them down based on their ratios.

If you proceed to make the normal saline for any reason, it is important to understand that tap water won’t be a good choice. The standard formula for saline has the water listed as purified water.

Hopefully, this answers your question about IV compounding. Good luck in your pharmacy tech program. This will be an exciting and informative role for you to fill.

Rating
starstarstarstarstar
Can someone answer/reply to this question already?
by: Anonymous

How is someone supposed to figure out how to set up the tic tac toe table or figure out how to solve this if nobody answers this question or replies to it?What is the point in anyone contributing math questions in first place if no one ever replies to their posts?It defeats the purpose of posting questions to begin with.This is very annoying.

Click here to add your own comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Pharmacy Tech Math Questions.

Back to Home

[?]Subscribe To This Site
  • XML RSS
  • follow us in feedly
  • Add to My Yahoo!


Didn't find what you were looking for? Use the box below to search this entire site.

Custom Search



Recent Articles

  1. What are some good strategies to preventing medication errors in the pharmacy?

    Apr 22, 18 11:04 PM

    It seems like some of the errors that have been recently made by our pharmacy techs are actually really preventable. Are there any good strategies that

    Read More

  2. Prior Authorization Rejection

    Apr 10, 18 11:13 PM

    This page covers what a Prior Authorization is and why it happens.

    Read More

  3. My 10 yr olds prescription -- Is The Following Situation a HIPPA Violation?

    Apr 10, 18 10:00 PM

    I know someone who is a pharmacy tech. My 10yr.olds medication was called into the pharmacy she works at. Her daughter and my daughters have an on-off

    Read More

  4. My Pharmacy told my mom that I didn't pick up my meds. Is this a Hippa Violation?

    Apr 10, 18 09:26 PM

    My pharmacy told my mom I didn't pick up my meds. Yes, I do have same last name but I have a different address; for all they know, that wasn't my mom.

    Read More

  5. Vitamin Resources

    Apr 08, 18 02:43 PM

    Vitamin Resources - Information about Vitamin A, The B Vitamins, Vitamin C, and Vitamin D.

    Read More

  6. Two HIPPA Questions: Including, Can Pharmacy Techs counsel patients?

    Mar 27, 18 10:20 PM

    under the hippa law can a pharmacist and a pharmacy tech speak about a clients medical record amongs each other and cam pharmacy techs counsel the patient

    Read More

  7. Should pharmacy errors be reported anywhere?

    Mar 27, 18 10:11 PM

    Our pharmacy manager wants us to report any pharmacy error that happens. Why is it important to report errors? Where should we report the errors to?

    Read More

  8. Former employee working for competitor; Enticing former customers to new pharmacy

    Mar 27, 18 09:32 PM

    We had a pharmacy tech resign, then go to work at a grocery/pharmacy - the tech has used PHI to target our patients and entice them to transfer their prescriptions.

    Read More

  9. Wondering how many Percocet I should have left in my bottle?

    Mar 27, 18 08:57 PM

    I got my 120 Percocet Feb 18 how many should be in my bottle March 16 i take 4 a day

    Read More

  10. If my pharmacist states the name of my medication very loudly at pickup, is that a Hippa violation?

    Mar 27, 18 08:32 PM

    Is it a HIPAA violation if a pharmacist says what you are taking very loud so others can hear what you are taking?

    Read More

  11. Is Publicly mentioning the name of the drug the patient is on a HIPPA violation?

    Mar 20, 18 08:53 PM

    If the name of the drug is mentioned in order to further assist the patient with getting them the medication, is this a violation of hipaa?

    Read More

  12. Osmolarity/Hospital Potassium Infusion problem (3 Part Question)

    Mar 20, 18 08:43 PM

    At 3:00 P.M., a pharmacist received an order to add 30 mEq/L of potassium chloride to the already running intravenous fluid for a patient. After checking

    Read More

  13. SILICONE RINGS IN A CLEAN ROOM

    Mar 20, 18 08:39 PM

    The USP797 rules state that no jewelry can be worn in the I.V. clean room setting because it wouldn't be sterile. I was wondering if silicone rings would

    Read More

  14. What is a "Root Cause Analysis"? And how does a pharmacy create "healthy safety culture"?

    Mar 20, 18 08:38 PM

    Recently there was a wrong-drug mistake at the pharmacy I'm employed at as a technician. One of my tech friends (who works at a different pharmacy) asked

    Read More

  15. Liquid Morphine: How many days will my meds last?

    Mar 20, 18 08:32 PM

    I am a post surgical patient I am on liquid morphine 22ml bottle. I’m allowed to take 2ml every 3 hours how many days should by bottle last?

    Read More