Download Pediatric Dosage Calculation Tutorial

Pediatric Dosage Calculation
Jordan and Logan Shaffer 11/08
How is Pediatric Dosage
Calculation Different than Adults?
• There is no standard dose
• All doses are based on a recommended
dosage based on:
Body weight in kilograms (for this dosage test)
Body Surface Area
Begin by Converting to Kilograms
• All MD orders will be ordered as a dose
per kg
• Convert the patient’s weight in lbs to kg by
dividing the weight in lbs by 2.2
• Example:
50 lbs divide by 2.2 = 22.7272727272727
Round to tenths place = 22.7 kg
Now you try!
1. Patients weight 48 lbs
How many kg does the patient weigh?
Patient weight 13.9 lbs
How many kg does the patient weigh?
Write your answer:
The MD order
The MD order can be written in several
ways:
•
•
In a daily total to be divided in equal doses
Ex: 30mg/kg/day equally divided in three
doses
or
Per dose
Ex: 30mg/kg TID
Lets Try it!
Patients weight: 45 lbs
2. Give 30mg/kg/day equally divided in three
doses
How many mg per dose? How much is the
24 hr drug total?
3. Give 30mg/kg TID
How many mg per dose? How much is the
24 hr drug total?
Write your answers
Is the dose safe?
• All pediatric dosages have a
recommended range in the drug guide
• These ranges are typically based on a 24
hour total amount of a dosage in mg, mcg,
gm, etc.
Is the order safe?
• A statement from the drug guide will be
provided on the dosage test
Ex: The drug guide states the recommended
safe dosage is 3-5 mg/kg/day to be given
in 2 divided doses
Lets try it!
4. MD order Sporanox (itraconazole) 40 mg
bid
Patients weight 47 lbs
Drug guide recommends 3-5mg/kg/day q12 hrs
Is the dose safe?
Write your answer
Supply
• Pediatric medication is typically supplied in
liquid form
• Some children can swallow pills or the
medication may only come in tablet form
• Most of the dosage assessment questions
will consist of medication in liquid form,
few questions will be in tablet form
Remember….
• Supply is expressed as a dosage amount per a
commonly used quantity
• Example
250mg/5ml
100mg/ml
50mcg/1ml
• This is different from the total amount of drug
dosage in the bottle
Calculate Liquid Medication
Dose desired
Dose on hand
X
quantity in ml
= volume to be administered
Lets try it!
5. MD order is to give 75 mg
Supply is 250mg/5ml
Calculate the amount to administer
Write your answer
Read a label
• Some dosage
questions will require
you to read a drug
label
Mixing
directions:
Add 30 ml
of water
Mix
Vigorously
Discard
after 5
days
Zantac
(ranitidine)
Oral
suspension
25mg/5ml
Lets try it!
6. Using the medication label supplied, how
many milliliters should be administered per
dose if the MD order is 100 mg po qd?
Write your answer
Intravenous
• Nothing new here….
Volume in ml x drop factor = gtt/min
Time in min
You are Ready!!! Lets put it all
together
7. The physician orders Kantrex
(kanamycin) oral suspension po 150
mg/kg/day in 2 divided doses.
Supply Kantrex 500mg/5ml.
Patients weight: 28 lbs
How many milliliters should be
administered per dose?
Write your answer
8. The physician orders Prostigmin
(neostigmine bromide) 8 mg q 4 hrs
The drug guide recommended dosage is
2-4 mg/kg/day in divided doses
Patients weight: 21 lbs
Is the physicians order safe?
Write your answer
Careful…some may have patients
weight in kg already!
9. The physician orders Primacor (milrinone
lactate) 50 mcg IM stat.
Supply: 0.2mg/ml
Patients weight: 12 kg.
How many milliliters should be administered
per dose?
Write your answer
10. The physician orders Sustiva (efavirenz)
20mg/kg po q 12 hrs.
Supply: Sustiva 50 mg tablets
Patients weight: 11 lbs
How many tablets are to be administered per
dose?
Write your answer
11. The physician orders IV fluids as follows:
Infuse 1000ml of 0. 45% normal saline
solution in 10 hours IV.
• Calculate the flow rate when the drop
factor is 10 drops per milliliters
Write your answer
12. An infusion of 700 ml of D5W was
ordered to infuse at a rate of 25 gtt/min for
8 hours. The drop factor is 15 drops per
milliliter.
• After 3 hours the patient had received 120
milliliters. The nurse decides the flow rate
must be recalculated.
• Recalculate the flow rate____gtt/min
Write your answer
PRACTICE TEST TIME