Dosage Calculations Practice
1 Dram = _____ mL - ---------------ANS: 4
1 gm = _____ gr. - ---------------ANS: 15
1 grain = ___ mg - ---------------ANS: 64.8 mg (60)
1/4 gr. = _____ mg - ---------------ANS: Answer: 15
Convert 1/4 to a decimal => 0.25, then solve
2 gm = _____ gr. - ---------------ANS: 30
A child weighs 10 lb 2 oz. What is their weight in kg? - ---------------ANS: 1. First,
convert the 2 oz to lbs. 2 oz is 0.1 lbs. This gives you 10.1 lbs.
2. Now convert 10.1 lbs to kg.
3. Answer: 4.59 => 4.6 kg
A patient has a bottle of warfarin (Coumadin) 5 mg tablets at home. After his most
recent international normalized ratio (INR), the doctor calls and tells him to take 7.5
mg/day. How many tablets (scored) should the patient take? - ---------------ANS: 1.5
Calculate the patient's total urinary output for the shift. The patient has continuous
bladder irrigation and a Foley catheter.
0800-1000: 3 Liters of bladder irrigation
1000: emptied Foley catheter 3600 mL
1100: 1 Liter of bladder irrigation
1200: 2 Liters of bladder irrigation and emptied 3250 mL from Foley catheter
1300: 1 Liter of bladder irrigation
1400: 1 Liter of bladder irrigation
1500: 1 Liter of bladder irrigation and emptied 3120 mL from Foley Catheter
1600-1900: 3 Liters of bladder irrigation
1900: emptied 4200 mL from Foley catheter - ---------------ANS: Intake: 2170 mL
Remember, irrigation in NOT urine. You can not count it. The patient received 3000
mL of irrigation from 0800-1000. When the Foley cath was emptied at 10, there was
a total of 3600 mL. 3000 mL of that was irrigation fluid. Only 600 mL was urine and
considered output.
, Calculate the patients INTAKE during your 12-hour shift.
0800: Two pieces of toast, 2 cups of oatmeal, 8 oz yogurt, 12 oz orange juice, 2 oz
grits
1000: Two 8 oz of coffee w/ 2 oz of cream in each
1100: 24 oz of ice chips
1200: IV infusion of Zosyn 50 mL, 2 mL IV push Zofran and 10 cc saline IV flush
1230: house salad, 12 oz soda, three 12 oz popsicles
1400: One pack of red blood cells (250 mL)
1500: 2 mL Morphine and 10 cc saline flush IV
1715: 10 cc saline flush IV
1600-1900: Normal Saline IV 100 cc/hr - ---------------ANS: Intake: 3394 mL
Remember, intake is measured in mL. Convert all ounces to mL. 1 oz = 30 mL
Also, ice melts to ONE HALF the total ounces. So, 24 ounces of ice melts to 12
ounces.
Do NOT count solids like the toast, oatmeal, yogurt, grits, or salad. It has to be liquid
at room temp to be counted.
Convert 0.3 g to kg. - ---------------ANS: 300
Convert 0.3 g to mg. - ---------------ANS: Answer: 300 mg
Since milli means 1000, just move the decimal 3 spots to the right. Or, set up an
equation as follows:
We know 1 g = 1000 mg.
1 g/1000 mg = 0.3 g/x
Solve for x by cross mulitiplying.
Convert 0.625 to a fraction. - ---------------ANS: Write down 0.625 over 1. (0.625/1)
Multiply the top and bottom by 1000. You are multiplying by 1000 because there are
3 digits after the decimal. If there were only 1 digit, you would multiply by 10. If there
were 2 digits, you would multiply by 100. 4 digits would be 10000 and so on.
After multiplying top and bottom by 1000, you will have 625 over 1000. Now, simplify
this by dividing each by 125 (largest number that will go into each evenly). Now, you
have 5 over 8, so 0.625 has been converted into the fraction 5/8.
1 Dram = _____ mL - ---------------ANS: 4
1 gm = _____ gr. - ---------------ANS: 15
1 grain = ___ mg - ---------------ANS: 64.8 mg (60)
1/4 gr. = _____ mg - ---------------ANS: Answer: 15
Convert 1/4 to a decimal => 0.25, then solve
2 gm = _____ gr. - ---------------ANS: 30
A child weighs 10 lb 2 oz. What is their weight in kg? - ---------------ANS: 1. First,
convert the 2 oz to lbs. 2 oz is 0.1 lbs. This gives you 10.1 lbs.
2. Now convert 10.1 lbs to kg.
3. Answer: 4.59 => 4.6 kg
A patient has a bottle of warfarin (Coumadin) 5 mg tablets at home. After his most
recent international normalized ratio (INR), the doctor calls and tells him to take 7.5
mg/day. How many tablets (scored) should the patient take? - ---------------ANS: 1.5
Calculate the patient's total urinary output for the shift. The patient has continuous
bladder irrigation and a Foley catheter.
0800-1000: 3 Liters of bladder irrigation
1000: emptied Foley catheter 3600 mL
1100: 1 Liter of bladder irrigation
1200: 2 Liters of bladder irrigation and emptied 3250 mL from Foley catheter
1300: 1 Liter of bladder irrigation
1400: 1 Liter of bladder irrigation
1500: 1 Liter of bladder irrigation and emptied 3120 mL from Foley Catheter
1600-1900: 3 Liters of bladder irrigation
1900: emptied 4200 mL from Foley catheter - ---------------ANS: Intake: 2170 mL
Remember, irrigation in NOT urine. You can not count it. The patient received 3000
mL of irrigation from 0800-1000. When the Foley cath was emptied at 10, there was
a total of 3600 mL. 3000 mL of that was irrigation fluid. Only 600 mL was urine and
considered output.
, Calculate the patients INTAKE during your 12-hour shift.
0800: Two pieces of toast, 2 cups of oatmeal, 8 oz yogurt, 12 oz orange juice, 2 oz
grits
1000: Two 8 oz of coffee w/ 2 oz of cream in each
1100: 24 oz of ice chips
1200: IV infusion of Zosyn 50 mL, 2 mL IV push Zofran and 10 cc saline IV flush
1230: house salad, 12 oz soda, three 12 oz popsicles
1400: One pack of red blood cells (250 mL)
1500: 2 mL Morphine and 10 cc saline flush IV
1715: 10 cc saline flush IV
1600-1900: Normal Saline IV 100 cc/hr - ---------------ANS: Intake: 3394 mL
Remember, intake is measured in mL. Convert all ounces to mL. 1 oz = 30 mL
Also, ice melts to ONE HALF the total ounces. So, 24 ounces of ice melts to 12
ounces.
Do NOT count solids like the toast, oatmeal, yogurt, grits, or salad. It has to be liquid
at room temp to be counted.
Convert 0.3 g to kg. - ---------------ANS: 300
Convert 0.3 g to mg. - ---------------ANS: Answer: 300 mg
Since milli means 1000, just move the decimal 3 spots to the right. Or, set up an
equation as follows:
We know 1 g = 1000 mg.
1 g/1000 mg = 0.3 g/x
Solve for x by cross mulitiplying.
Convert 0.625 to a fraction. - ---------------ANS: Write down 0.625 over 1. (0.625/1)
Multiply the top and bottom by 1000. You are multiplying by 1000 because there are
3 digits after the decimal. If there were only 1 digit, you would multiply by 10. If there
were 2 digits, you would multiply by 100. 4 digits would be 10000 and so on.
After multiplying top and bottom by 1000, you will have 625 over 1000. Now, simplify
this by dividing each by 125 (largest number that will go into each evenly). Now, you
have 5 over 8, so 0.625 has been converted into the fraction 5/8.
