# Math help

1. Im studying for my Math final and our teacher gave us a practice sheet but no answers to the questions!

Here's two I'm not a 100% sure of..

Available 60mg/10mL. ordered 7.5mg/500mL babg of NS. How much should be added to the bag??

Also this one:

Oreded: Augmentin 10mg/kg/day q6h. Available: 250mg per 5mL. The patients weight was 75lbs. How much will the patient receive per dose?

Thank You!!!
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Joined: Aug '05; Posts: 294; Likes: 56
Specialty: ICU, Mother/Baby

3. Available 60mg/10mL. Ordered 7.5mg/500mL bag of NS. How much should be added to the bag?
Dose Desired: 7.5 mg/500mL
Dose on Hand: 60 mg/10 mL

7.5 mg (dose desired)/60 mg (dose on hand) x 10 mL (amount of solution the dose on hand comes in) = 1.25 mL of the drug solution should be added to the bag of NS.
Ordered: Augmentin 10mg/kg/day q6h. Available: 250mg per 5mL. The patients weight was 75lbs. How much will the patient receive per dose?
Dose Desired: 10mg/kg/day
Dose on Hand: 250mg/5mL
Patient's Weight: 75 lbs.
Conversion Factor: 1 kg = 2.2 lbs
Conversion Factor (for q6h of doses): 4 doses per day

10 mg/kg (dose desired) x 75 lb/1 day (patient's weight/dose desired per day) x 1 kg/2.2 lb (conversion factor) x 5 mL/250 mg (dose on hand) = 6.81 mg/day (dose to give for a day)

Then, 6.81 mg/day (dose to give in 24 hours) x 1 day/4 doses (number of doses in 24 hours) = 1.74045 mg/dose, or rounded off to 1.7 mg/dose (amount to give with each q6h dose)
4. Quote from Daytonite
Dose Desired: 7.5 mg/500mL
Dose on Hand: 60 mg/10 mL

7.5 mg (dose desired)/60 mg (dose on hand) x 10 mL (amount of solution the dose on hand comes in) = 1.25 mL of the drug solution should be added to the bag of NS.
Dose Desired: 10mg/kg/day
Dose on Hand: 250mg/5mL
Patient's Weight: 75 lbs.
Conversion Factor: 1 kg = 2.2 lbs
Conversion Factor (for q6h of doses): 4 doses per day

10 mg/kg (dose desired) x 75 lb/1 day (patient's weight/dose desired per day) x 1 kg/2.2 lb (conversion factor) x 5 mL/250 mg (dose on hand) = 6.81 mg/day (dose to give for a day)

Then, 6.81 mg/day (dose to give in 24 hours) x 1 day/4 doses (number of doses in 24 hours) = 1.74045 mg/dose, or rounded off to 1.7 mg/dose (amount to give with each q6h dose)
Thanks! Thats what I came up with too. Just wanted to be sure since we didnt have an answer sheet! The study group we have, half of them had that answer and the other half had another. L:ast question was a rounding issue for a few.

But I really do apperciate your help!!!

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