NUR 101 Dosage Calculations (Common Approx Conversions and Rounding Rules)

115 terms by palentan 

Create a new folder

Advertisement Upgrade to remove ads

NUR 101 Fundamentals CCTC Fall 2011 Judy G Whitaker

Oral Medications: Scored Tablets

Calculate to the tenth and round to the nearest half tablet:
1.5 tablets = give 1 1/2 tablets
1.7 tablets = give 2 tablets

Oral Medications: ALL other oral pills

Calculate to the tenth and round to the whole number:
1.4 tablets = give 1 tablet
1.9 tablets = give 2 tablets

Oral Medications: When preparing ORAL LIQUIDS:

Calculate to the hundredth and round to the tenth:
2.32 mL = give 2.3 mL
2.36 mL = give 2.4 mL

Injections: When giving more than 1 mL:

calculate to the hundredth and round to the tenth:
1.26 mL = give 1.3 mL
1.38 mL = give 1.4 mL

Injections: When giving less than 1 mL:

calculate to the thousandth and round to the hundredth:
0.823 mL = give 0.82 mL
0.666 mL = give 0.67 mL

When working with fractions that have repeating decimal:

it is recommended that you leave the fraction intact while working through the problem:
1/6 = 0.16666 -- leave as 1/6 to calculate the problem

Body Weight:

Calculate to the hundredth and round to the tenth:
7.35 kg = 7.4 kg

Tube Feeding: When calculating calories:

calculate to the tenth and round to the whole number

Tube Feeding: When calculating mL/hr:

calculate to the hundredth and round to the tenth

IV Problems: When calculating drop factor:

calculate to the tenth and round to the whole number

IV Problems: When calculating mg/min, mcg/hr, units/mL, mL/hr:

calculate to the hundredth and round to the tenth

IV Problems: When calculating titration factor:

carry out to the thousandth and round off to the nearest hundredth.

Type of Medication: Scored Tablets:

round to 1/2 tablet

Type of Medication: Oral Pills:

round to whole tablet

Type of Medication: Oral Liquids:

round to the tenth

Type of Medication: Injections over 1 mL:

round to the tenth

Type of Medication: Injection less than 1 mL:

round to the hundredth

Body Weight:

round to the tenth

Calories:

round to the nearest whole number

Tube Feeding mL/hr

round to the nearest tenth

Drop factors

round to the whole number

mg/min, mcg/hr, units/mL, mL/hr

round to the tenth

Volume: Metric: 1 Liter

1L = 1 qt or 32 oz (apothecary) = 1 qt (household)

Volume: Metric:

500 mL = 1 pt or 16 oz (apothecary) = 1 pt (household)

Volume: Metric: 240 mL

240 mL = 8 oz (apothecary) = 1 glass or 1 measuring cup (household)

Volume: Metric: 180 mL

180 mL = 6 oz (apothecary) = 1 cup of coffee

Volume: Metric: 30 mL

30 mL = 1 oz or 8 dr (apothecary) = 2 T or 6 t (household)

Volume: Metric: 15 mL

15 mL = 0.5 oz or 4 dr (apothecary) = 1 T (household)

Volume: Metric: 4 - 5 mL

4 - 5 mL = 1 dr or 60 minims (apothecary) = 1 t (household)

Volume: Metric: 1 mL or 1 cc

1 mL or 1 cc = 15 (16) minims (apothecary) = 15 - 16 gtt (household)

Weight: Metric: 30 g

30 g = 1 oz (apothecary)

Weight: Metric: 15 g

15 g = 4 drams (apothecary)

Weight: Metric: 1 g or 1000 mg

1 g or 1000 mg = 15 (16) gr (apothecary)

Weight: Metric: 60 (65) mg

1 gr (apothecary)

Weight: Metric: 1 mg or 1000mcg

1 mg = .001 g

Other: Metric: 1 kg or 1000g

1 kg or 1000 g = 2.2 lbs (apothecary)

Other: Metric: 2.54 cm

2.54 cm = 1 in (household)

Temperature Conversion: Celsius to Fahrenheit

F = 9/5 C + 32 or (C x 1.8) +32 = F

Temperature Conversion: Fahrenheit to Celsius

C = 5/9 (F-32) or (F -32) / 1.8 = C

Conversions:

1 g = 1000 mg
1000 mcg = 1 mg
1 kg = 1000 g

Gram

The basic unit for weight (solid).

Liter

The basic unit for volume (liquid).

Meter

The basic unit for length.

Kilo

1000 - One thousand times.

Hecto

100 - One hundred times.

Deka

10 - Ten times.

Deci

0.1 - One tenth.

Centi

0.01 - One hundredth part of.

Milli

0.001 - One thousandth part of.

Micro

0.000001 - One millionth part of.

mcg

Microgram.

mg

Milligram.

kg

Kilogram.

dL

Deciliter.

mL

Milliliter.

1 Kilogram (kg)

1000 grams (g)

1 gram (g)

1000 milligrams (mg)

1 milligram (mg)

1000 micrograms (mcg)

1 liter (L)

1000 milliliters (mL)

1 milliliter (mL)

0.001 liter (L)

1 meter (m)

100 centimeters (cm) = 1000 mm

1 millimeter (mm)

0.001 meter (m) = 0.1 cm

1 ounce (oz)

30 mL

1 tablespoon (T or tbs)

15 mL

2 tablespoons (T or tbs)

1 ounce (oz)

1 teaspoon (t or tsp)

5 mL

1 cup (standard measuring cup)

240 mL (8 ounces)

1 pint (pt)

500 mL (16 ounces)

1 quart (qt)

1000 mL (32 ounces)

15 grains (gr)

1000 mg = 1 gram (g)

1 grain (gr)

60 mg

2.2 pound (lb)

1 kg (1000 g)

1 inch (in)

2.5 cm

A patient has been taking 0.5g tablets of
acetaminophen (Tylenol) P.O. for
postoperative pain after an inguinal hernia
repair. If the patient took a total of 1,500
mg in 72 hours, how many 0.5-g tablets
were taken?

0.5g: 1 tab :: 1.5g :

X tab= 3 tablets

The doctor's order reads glyburide 1.5 mg
3 tablets P.O. daily. What's the total dose
in milligrams?

X = 4.5 mg

Your patient is receiving 500 mg of cefaclor oral suspension. The lable reads cefaclor 250mg/5ml, and the bottle contains 100ml. How many milliliters of cefaclor should you give? ,

x X 250 mg = 5 ml X 500 mg

X= 10 ml

The doctor orders 0.125 mg of digoxin (Lanoxin) elixir for a patient developing heart failure and pulmonary edema. The bottle is labeled 0.05 mg/ml. How many milliliters should the nurse administer?

0.05 mgX xml = 0.125 mg X 1ml

x = 2.5 ml

Your patient needs 400 mg of erythromycin oral suspension. the label reads erythromycin 200 mg/ 5 ml. How many milliliters should you give?

x X 200mg = 5 ml X 400 mg

x= 10ml

The doctor orders 100 mg Dilantin oral suspension t.i.d. for your patient. The label reads Dilantin 125 mg/5ml. How many mililiters should you give?

100 mg X 5 ml = 125 mg X x

x= 4ml

A doctor orders 25 g of lactulose (Cephulac) for a patient entereing a prehapatic coma. The bottle is labeled 10 g/15ml. How many milliliters should the patient receive?

10 g X xml = 15 ml X 25g

X= 37.5

Your patients's order reads aspirin gr 10 P.O. daily, but the unit-dose package says aspirin 325 mg. How many tablets should you administer daily?

60 mg X 10 grains = x X 1 grain

x X 325 mg = 1 tablet X 600 mg

X= 1.846 all probably round to 2

A prescriptoin reads phenobarbital gr 1/4 take gr 1/2 t.i.d. P.O. daily. How many milligrams of phenobarbital should this patient receive?

60 mg X grain 1/4 = X x 1 grain

X x grain 1/4 = 15mg x 1/2

X= 30 mg

Your patient receives a prescription for 62.5 mcg of digoxin elixir P.O. daily. The elixir reads 0.05 mg/ml. How many milliliters of digoxin should you give?

X x 0.05 mg = 1 ml x 0.0625

X= 1.25

patient is to receive 0.25 mg of Synthroid. The medication is only available in tablets that contain 125mcg each. How many tablet should the nurse administer?

X = 2 tablets

The doctor orders 0.05 mg Synthroid P.O., but the only Synthroid on hand is in tablets that contain 0.025 mg each. How many tablets should you give?

1 tablet X 0.05mg = 0.05 mg X x x=

2 tablets

1 liter (L) = ____ ml

1000 milliliters (ml)

1 ounce (oz) = ____ ml

30 milliliters (ml)

1 ounce (oz) = ____ tbsp

2 tablespoons (tbsp)

1 milliliter (ml) = ____ cc

1 cubic centimeter (cc)

1 teaspoon (tsp) = ____ ml

5 milliliters (ml)

1 tablespoon (tbsp) = ____ ml

15 milliliters (ml)

1 tablespoon (tbsp) = ____ tsp

3 teaspoons (tsp)

1 gram (g) = ____ mg

1000 milligrams (mg)

1 pint = ____ mg

500 milligrams (mg)

1 milligram (mg) = ____ mcg

1000 micrograms (mcg)

1 kilogram (kg) = ____ g

1000 grams (g)

1 kilogram (kg) = ____ lb

2.2 pounds (lb)

1 inch (in) (") = ____ cm

2.5 centimeters (cm)

8 ounces (oz) = ____ c

1 cup (c)

8 ounces (oz) = ____ ml

240 milliliters (ml)

grains (gr) X = ____ mg

650 milligrams (mg)

grains (gr) V = ____ mg

325 milligrams (mg)

240 milliliters (ml) = ___ c

1 cup (c)

65 milligrams (mg) = ___ gr

Grains (gr) 1

1 dram = ____ ml

4 milliliters (ml)

1 coffee cup = ____ oz

6 ounces

1 cup = ____ oz

8 ounces

1 quart = ____ L

1 liter

1 quart = ____ pints

2 pints

1 centimeter = ____ mm

10 millimeters

1 glass = ____ oz

12 ounces

Convert Celsius to Fahrenheit

1. multiply by 1.8
2. add 32

Convert Fahrenheit to Celcius

1. subtract 32
2. divide by 1.8

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set