Download foundations dosage calculation packet

UNIVERSITY OF TEXAS OF PERMIAN BASIN
NURSING PROGRAM
DOSAGE CALCULATION PACKET
Fall 2016
STUDENT:
CALCULATION CONVERSION CHART
1 kilogram (kg)
=
2.2 pounds (lb)
1 kilogram (kg)
=
1000 grams (g, gm, Gm GM)
1 gram
=
1000 milligrams (mg)
1 milligram
=
1000 micrograms (mcg)
1 liter (l, L)
=
1000 milliliter (ml, mL)
1 milliliter (ml, mL)
=
1 cc
5 milliliter (ml, mL)
=
1 teaspoon (tsp, t)
15 milliliter (ml, mL)
=
3 teaspoons (tsp, t)
3 teaspoons (tsp, t)
=
1 tablespoon (T, tbsp.)
1 tablespoon (T, tbsp.)
=
15 milliliter (ml, mL)
30 milliliter (ml, mL)
=
1 ounce (oz)
1 inch
=
2.54 centimeter (cm)
MEASUREMENT EQUATIONS
Body Mass Index (BMI) = [weight in pounds (lb) / (height in inches)2] x 703
Body Surface Area (m2) = square root of [(height in centimeters) x (weight in kilograms) / 3600]
OR
Square Root of [(height in inches) x (weight in pounds) / 3131]
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MEDICATION ADMINISTRATION ABBREVIATIONS
ROUTE
MEANING
A.D., ad
A.S., as
A.U., au
IM
ID
IV
IVPB
KVO
NGT
O.D., od
O.S., os
O.U., ou
PO, po
PR, pr
SC, subc, sc, SQ, subQ
SL, sl, subl
TKO
Vag
Right ear
Left ear
Both ears
Intramuscular
Intradermal
Intravenous
Intravenous piggyback
Keep vein open
Nasogastric tube
Right eye
Left eye
Both eyes
By mouth, orally
By rectum, rectally
Subcutaneous
Sublingual
To keep open
vaginal
TIMES
MEANING
a with a line over it
AC, ac
Ad lib
BID, b.i.d., bid
c with a line over it
hs
NPO
p with a line over it
PRN, prn
q
qAM
qh
qs
q2h
QID, qid
s with a line over it
STAT
TID, tid
before
Before meals
As desired
Twice a day
with
Hours of sleep, bedtime
Nothing by mouth
after
As needed
Every
Every morning
Every hour
Every shift
Every two hours (number is variable)
Four times a day
without
Immediately
Three times a day
ADDITIONAL ABBREVIATIONS
MEANING
gtt
cap
SR
supp
susp
TORB
VORB
Drops
Capsule
Slow-release
Suppository
suspension
Telephone order read back
Verbal order read back
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CONVERSION PRACTICE WORKSHEET
EXAMPLE:
How many mL are in a 3 teaspoon dose? (3 tsp = _______ mL)
***Note how the “tsp” cancels out because in the first equation tsp is in the denominator and in the following equation tsp is in the
numerator.
QUESTIONS:
1.
1 tbsp = ____________mL
2.
120 lb = ____________ kg
3.
2 tsp = _____________ mL
4.
5000 g = ____________ kg
5.
7000 mcg = _________ g
6.
2 inches = ___________ cm
7.
8 ounces = ___________ mL
8.
30 mL = _____________ cc
9.
0.5 kg = _____________ g
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Dosage Calculation for Non-Intravenous Medications
In ALL calculations, do not round until the end!!! If you have to round, round to the nearest tenth
EXAMPLE: 2.5687 will round to 2.6
EXAMPLES:
The physician orders Ampicillin 0.25 grams PO daily. The dose supplied (available) is Ampicillin 125 mg tablets. How many tablets will you
give?
The physician orders Fentanyl 0.125 mg PO STAT. The dose supplied (available) is Fentanyl 250mcg/5mL.
*** Because we only have mL available, ask…” how many mL will I give per dose?”
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Questions:
1. The patient should receive codeine 30 mg tablet PO BID. The dose supplied is 60 mg/tablet. How many tablets should the patient receive
per dose?
2. The order is for polycillin 250mg PO Q6 hours. The dose supplied is 100 mg per 5 mL. How many mL will you administer?
3. The physician orders elixir of Benadryl 25 mg PO Q4hours. The dose supplied is 12.5mg / 5mL.
A. How many mL should the patient receive per dose?
B. If the patient can receive the dose every 4 hours, how much in milligrams and milliliters can the patient receive per day?
4. Antivert 25 mg PO TID is ordered for your patient. On hand, you have Antivert 10 mg scored tablets.
A. How many tablets will you administer per dose?
B. How many tablets will you administer per day?
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5. The physician orders Synthroid 225 mcg PO QAM. The dose available is 150mcg / 1 tablet. How many tablets will the patient receive?
6. Lanoxin 0.25 mg PO daily. You have lanoxin 0.125 mg tablets. How many tablets will you give?
7. You patient is ordered to have Chloral Hydrate 250 mg PO QHS. The following medication comes from the pharmacy. How many mL will
you administer?
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8. The physician orders Dilantin 250 mg PO BID. The following medication comes from the pharmacy.
A. How many mL will you administer per dose?
B. How many mL will you administer per day?
9. You patient is to receive Amoxil suspension 10 mg/kg. The patient’s weight this morning was 44 lbs. The medication you have available
is 250mg / 5mL. How many mL per dose will you administer?
10. The physician orders morphine 0.6 mg/kg. The patient’s weight is 80lbs. The medication you have available is 100mg / 5 mL. How many
mL per dose will you administer?
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DOSAGE CALCULATION FOR INTRAVENOUS MEDICATIONS
In ALL calculations, do not round until the end!!! If you have to round, round to the nearest tenth
EXAMPLE: 2.5687 will round to 2.6
EXAMPLES:
The physician orders Heparin 1500 units/hr IV. The pharmacy sends an IV bag with the label Heparin 25,000 units in 250 mL of D5W. How
many mL per hour will you administer?
Questions:
1. The physician orders aminophylline 35mg / hr IV. The dose supplied is aminophylline 1g / 250 mL NS. How many mL/hr will you deliver?
2. The patient is receiving 25,000 units in 250 mL D5W infusing at 30 mL/hr. How many units per hour is the patient receiving?
3. The patient is ordered to receive 900 units/hr IV. The dose supplied is 25,000 units / 500 mL D5W. How many mL per hour is the patient
receiving?
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DOSAGE CALCULATION FOR INTRAVENOUS FLUID ADMINISTRATION
In ALL calculations, do not round until the end!!! If you have to round, round to the nearest tenth
EXAMPLE: 2.5687 will round to 2.6
[amount of fluid to be infused] x [drop factor] / minutes to infuse = gtts/minute
EXAMPLES:
The physician orders one liter of D5W to run this 8-hour shift. The drop factor is 15. What is the drip rate per minute (infusion rate)?
The physician orders 1000 mL D5W. The drop factor is 15 with an infusion rate of 50 gtts/min. How many hours will it take to infuse?
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QUESTIONS:
1. The physician orders 250 mL of normal saline to infuse in 30 minutes. The drop factor is 10 gtts/mL. What is the drip rate per minute
(infusion rate)?
2. The physician orders 1000 mL of D5W and 0.45% NS to infuse over 8 hours. The drop factor is 20 gtts/mL. What is the drip rate per minute
(infusion rate)?
3. The physician orders 1000 mL of D5W. The drop factor is 10 gtts/mL with an infusion rate of 21 gtts/min. How many hours will it take the
fluid to infuse?
4. The physician orders 800 mL LR to infuse in 8 hours. The drop factor is 15 gtts/mL. What is the drip rate per minute (infusion rate)?
5. The physician orders 250 mL of NS to be infused. The drop factor is 15 gtts/mL with an infusion rate of 60 gtts/min. How many hours will
it take the fluid to infuse?
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