9 Ounces to mLYou are doing intake and output and the mother states the infant has consumed 3 ½ ounces of formula. How many mL has the infant consumed?3.5 x 30 mL = 105 mLYou would record 105 mL on the intake record
11 TablespoonsYou are teaching a geriatric patient how to measure her medications. She is to take 15 mL of liquid Maalox to aid digestion.You would instruct her to use what household measuring device to take her mediation?Teaspoon or tablespoonShe would take one tablespoon of medication.
12 TeaspoonYou are working with a mother of a toddler and she has been instructed to give the child 1 ½ teaspoons of medication. You are demonstrating how to give the medication with a syringe with measurements in mL.How many mL would you have her give?
13 1 Teaspoon = 5 ml 1 ½ teaspoons = 1.5 teaspoons 1.5 teaspoon x 5 mL = 7.5 mLYou would have her draw up 7.5 mL in a po syringe.
14 Nursing AlertRemember if there is not a number to the left of the decimal point a zero is placed there to highlight the decimal point placement.Correct: 0.5 mL or 0.25 gIncorrect: 5.0 mL or 25.0 g
15 Nursing AlertDecide whether you are converting from smaller unit to larger unit or larger unit to smaller unit.
16 Liter to milliliters 1 liter (L) = 1000 milliliters (mL) 1.2 x 1000 = 1200 mL
17 Milliliters (mL) to Liters (L) Change mL to Liter (L)mL is smaller than a literMove decimal point three places to the right750 mL = 0.75 L
18 Metric Units Weight Kilogram = kg 1 kg = 1000 grams (g) 1 gram (g) = 1000 milligrams (mg)1 milligram (mg) = 1000 micrograms mcg
19 How to calculate kilograms Remember you will weigh less in kilogramsTo convert pounds to kilogram you divide by 2.2Convert 100 pounds to kg100 / 2.2 = or 45.45In the infant / small child carry out to the 100th or two decimal places.
20 Example Convert the following metric measurement: 0.2 mg = ______ g. (gram is larger than a mg)Need to move the decimal 3 places or divide by 1000.Answer 0.2 mg = g
21 Example100 mcg = ______ mgYou are going from a smaller unit to a larger unit.You would move the decimal point 3 places or divide by 1000.100 mcg = 0.1 mg
23 International UnitsHeparin, insulin, penicillin, epoetin products (Epogen, Procrit) are measured in international units.Example: regular insulin 10 units SQ in amExample: penicillin 600,000 units IM x one dose
24 Milliequivalent Measures Do not confuse with milligrams.Notation is mEqMilliequivalent measures the number of grams of equivalent weight of a drug contained in 1 mL of normal saline.
25 mEqCommon drugs: sodium bicarbonate, sodium chloride, potassium chloride.Examples:10 mEq of potassium chloride to ½ L of IV solution15 mEq of sodium chloride to 1 L of IV solution
35 Ratio – Proportion Method Using the ratio proportion method offers a systematic approach to solving clinical math calculations.
36 The Set-up Solving the unknown The cookies and the eggs If the recipe states you need 2 eggs to make 2 dozen cookies. How many eggs do you need to make a dozen cookies?24 cookies 12 cookies2 eggs = x eggs
37 Practice Problem Page 106 Lorazepram 3 mg IV every 6 hours as needed. Lorazepam is supplied as 4 mg / mL
38 The set-up 4 mg 3 mg 1mL = x mL (cross multiply) 3 / 4 x = 0.75 mL You would draw up 0.75 mL to equal 2 mg of Lorazepam
39 Practice Problem Page 108 Phenytoin sodium 300 mg by mouth at bedtime. Phenytoin sodium supplied as 125 mg / 5 mL.
40 The Set-up125 mg 300 mg5 mL = x mL(Cross multiple) (X is on the bottom)1500125 X = 12 mL equals 300 mg of the drug
41 Practice ProblemsRemember to label properly and put the x on the bottom.
46 Determine the dosage 5 mcg / kg / day 5 mcg x (weight in kg) = mcg per doseDrug is rounded to 395 mcg per dose to be added to 50 mL of Dextrose 5% in Water.
47 Practice ProblemPhenobarbital 30 – 120 mg / kg per day in 3 divided dosesPhysician orders the maximum dose or 120 mg / day to be given q 8 hours.1st you would need to divide 120 mg by 3 doses = 40 mg per dose
48 Determine the Amount Phenobarbital is provided as 65 mg / mL For one dose you would need to draw up how much of the medication?40 mg = 60 mgx mL 1 mL40 mg = mL60 x