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ATl DOSAGE CALCULATION PRACTICE ASSESSMENT Page Page 2 CONVERTING POUNDS TO KILOGRAMS STEP OUTLINE VIEW For example, the client’s weight is 128 lb. Determine this client’s weight in kg. (Round to the tenth.) STEP 1: What is the unit of measurement you need to calculate?kg STEP 2: Set up an equation and solve for X, with X representing the amount of kilograms. 2.2lb _ Client's weight inIb ikg ~ x kg 2.210 _ 1281b ikg ~ xkg Cross multiply and solve for X. X= 58.1818 STEP 3: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. For the purpose of this module, we will round to the tenth. Therefore, 58.1818 rounds to 58.2. STEP 4: Reassess to determine if the equivalent makes sense. If 1 kg = 2.2 lb, it makes sense that 128 lb = 58.2 kg. CONVERTING POUNDS TO KILOGRAMS STEP OUTLINE VIEW For example, the client’s weight is 96 lb. Determine this client’s weight in kg. (Round to the tenth.) STEP 1: What is the unit of measurement you need to calculate?kg STEP 2: Set up an equation and solve for X, with X representing the amount of kilograms. 2.2Ib _ Client's weight in lb 1kg 7 x kg 2.2Ib _ 96lb ikg ~ Xkg Cross multiply to solve for X. X = 43.6363 STEP 3: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. For the purpose of this module, we will round to the tenth. Therefore, 43.6363rounds to 43.6. Page 4 X=0.875 STEP 3: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. For the purpose of this module, we will roundto the tenth. Therefore, 0.875 rounds to 0.9. STEP 4: Reassess to determine if the equivalent makes sense. If 1 lb = 16 oz, it makes sense that 14 oz = 0.9 lb. STEP 5: Remember to add the remainder weight. It is important not to forget the rest of the client’s weight, which in this example is 21 lb. So 21 [b+ 0.9 |b = 21.9 lb. CONVERTING OUNCES TO POUNDS TO KILOGRAMS STEP OUTLINE VIEW For example, convert a client's weight from oz to Ib, then from Ib to kg. The client's weight is 65|b 12 oz. (Round to the tenth.) STEP 1: What is the unit of measurement you need to calculate? Ib STEP 2: Set up an equation and solve for X, with X representing the amount of pounds. 160z _ Client's weight in oz (Ib 7 XIb 160z _ 1202 1lb ~ XIb Cross multiply and solve for X. X=0.75. STEP 3: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. For the purpose of this module, we will round to the tenth. Therefore, 0.75 roundsto 0.8. STEP 4: Reassess to determine if the equivalent makes sense. If 1 lb = 16 oz, it makes sense that 12 oz = 0.8 lb. STEP 5: Remember to add the remainder weight. It is important not to forget therest of the client’s weight, which in this example is 65 Lb. So 65 lb + 0.8 lb =65.8 lb. The client’s weight is 65.8 lb. Determine this client’s weight in kilograms. (Round tothe tenth.) Page 5 STEP 6: What is the unit of measurement you need to calculate?kg STEP 7: Set up an equation and solve for X, with X representing the amount of kilograms. 2.2Ib _ Client's weight in Ib 1kg ~ x kg 2.2Ib _ 65.61b ikg ~ Xkg Cross multiply and solve for X. X=29.9 STEP 8: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. For the purpose of this module, we will round to the tenth. In this example, thereis no reason to round your answer because it is already rounded to the tenth. STEP 9: Reassess to determine if the equivalent makes sense. If 1 kg = 2.2 lb, it makes sense that 65.8 lb = 29.9 kg. CONVERTING OUNCES TO POUNDS TO KILOGRAMS STEP OUTLINE VIEW For example, convert a client's weight from oz to Ib, then from Ib to kg. The client's weight is 33lb 8 oz. (Round to the tenth.) STEP 1: What is the unit of measurement you need to calculate? Ib STEP 2: Set up an equation and solve for X, with X representing the amount of pounds. 160z _ Client's weight inoz 1lp ~ * Ib 160z _ Boz 1lb ~ XIb Cross multiply and solve for X. X=0.5 STEP 3: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. For the purpose of this module, we will round to the tenth. In this example, thereis no reason to round your answer because it is already rounded to the tenth. STEP 4: Reassess to determine if the equivalent makes sense. If 1 lb = 16 oz, it makes sense that 8 oz = 0.5 lb. Page 7 In this example, there is no reason to round your answer because it is already rounded to a whole number. STEP 4: Reassess to determine if it makes sense. If the provider prescribes 100 mg/kg/day and the client weighs 69.5 kg, it makes sense that the client will receive 6,950 mg/day. CALCULATING MILLIGRAMS PER KILOGRAM PER DAY STEP OUTLINE VIEW The provider has prescribed 3 mg/kg/day. The client's weight is 86 kg. What is the daily dose of medication you would administer? (Round to a whole number.) STEP 1: What is the unit of measurement you need to calculate? mg STEP 2: Set up an equation and solve for X, with X representing the amount of milligrams. mg xkg / day 3 mg x 86 kg = 258 mg/day X= 258 STEP 3: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. In this example, there is no reason to round your answer because it is already rounded to a whole number. STEP 4: Reassess to determine if it makes sense. If the provider prescribed 3 mg/kg/day and the client weighs 86 kg, it makes sense that the client will receive 258 mg/day. CALCULATING MILLIGRAMS PER KILOGRAM PER DAY STEP OUTLINE VIEW The provider has prescribed 15 mg/kg/day. The client's weight is 33 kg. What is the daily doseof medication you would administer? (Round to a whole number.) STEP 1: What is the unit of measurement you need to calculate? mg STEP 2: Set up an equation and solve for X, with X representing the amount of milligrams. mg xkg / day 15 mg x 33 kg = 495 mg/day X= 495 STEP 3: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. In this example, there is no reason to round your answer because it is already rounded to a whole number. STEP 4: Reassess to determine if it makes sense. If the provider prescribed 15 mg/kg/day and the client weighs 33 kg, it makessense that the client will receive 495 mg/day. Page 8 CALCULATING SINGLE DOSES STEP OUTLINE VIEW The provider has prescribed amoxicillin (Amoxil) 50 mg/kg/day PO every 8 hr. The client's weight is 10.5 kg. What is the single dose of medication you would administer? (Round to awhole number.) STEP 1: What is the unit of measurement you need to calculate? mg STEP 2: Set up an equation and solve for X, with X representing the amount of milligrams. mg xkg/day 50 mg x 10.5 kg = 525 mg/day X= 525 mg/day STEP 3: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. In this example, there is no reason to round your answer because it is already rounded to a whole number. STEP 4: Reassess to determine if it makes sense. If the provider prescribed 50 mg/kg/day and the client weighs 10.5 kg, it makessense that the client will receive 525 mg/day. STEP 5: Divide into individual dosages. Divided doses every 8 hr 525/3=175 STEP 6: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. In this example, there is no reason to round your answer because it is already rounded to a whole number. STEP 7: Reassess to determine if it makes sense. If the client is to receive 525 mg/day and it is divided into 3 doses, it makes sensethat the client will receive 175 mg/dose. CALCULATING SINGLE DOSES STEP OUTLINE VIEW The provider has prescribed cefotetan (Cefotan) 80 mg/kg/day IV divided in doses every 12 hr. The client’s weight is 57.2 kg. What is the single dose of medication you would administer? (Round to a whole number.) STEP 1: What is the unit of measurement you need to calculate? mg STEP 2: Set up an equation and solve for X, with X representing the amount of milligrams. mg xkg / day 80 mg x 57.2 kg = 4,576 mg/day Page 10 STEP 4: Reassess to determine if the equivalent makes sense. If 1 lb = 16 oz, it makes sense that 10 oz = 0.6 lb. STEP 5: Add the remainder weight. 23 lb+ 0.6 lb=23.6lb For example, the client’s weight is 23.6 lb. Determine this client’s weight in kg. (Round to the tenth.) STEP 6: What is the unit of measurement you need to calculate?kg STEP 7: Set up an equation and solve for X, with X representing the amount of kilograms. 2.2Ib _ Client's weight inib 1kg ~ x kg 2.2Ib _ 23.616 ikg ~ Xkg Cross multiply and solve for X. X= 10.72 STEP 8: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. For the purpose of this module, we will round to the tenth. Therefore, 10.72 rounds to 10.7. STEP 9: Reassess to determine if the equivalent makes sense. If 1 kg = 2.2 lb, it makes sense that 23.6 lb = 10.7 kg. The provider has prescribed ferrous sulfate (Feosol) 3 mg/kg/day PO divided in equal doses every 12 hr. The client’s weight is 10.7 kg. What is the single dose of medication you should administer? (Round to the tenth.) STEP 10: What is the unit of measurement you need to calculate? mg STEP 11: Set up an equation and solve for X, with X representing the amount of milligrams. mg x kg / day 3 mg x 10.7 kg = 32.1 mg/day X = 32.1 mg/day Page 11 STEP 12: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. In this example, there is no reason to round your answer because it is already rounded to the tenth. STEP 13: Reassess to determine if it makes sense. If the provider prescribed 3 mg/kg/day and the client weighs 10.7 kg, it makes sense that the client will receive 32.1 mg/day. STEP 14: Divide into individual doses. Divided doses every 12 hr 32.1/2=16.05 STEP 15: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. For the purpose of this module, we will round to the tenth. In this example, 16.05 rounds to 16.1. STEP 16: Reassess to determine if it makes sense. If the client is to receive 32.1 mg/day and it is divided into 2 doses, it makessense that the client will receive 16.1 mg per dose. CALCULATINGAMOUNT OF MEDICATION STEP OUTLINE VIEW For example, you are preparing to administer ferrous sulfate (Fer-In-Sol) 18 mg PO daily. You have ferrous sulfate 75 mg/mL and must decide how many mL to give. Complete the following steps to calculate the appropriate dosage using the dimensional analysis method. (Round to the tenth.) STEP 1: What is the unit of measurement you need to calculate? mL STEP 2: What is the Quantity of the dose available? 1mL STEP 3: What is the dose available? Dose available = Have. 75mg STEP 4: What dose do you need? Dose needed = Desired. 18mg STEP 5: Do you need to use the conversion factor? No STEP 6: Set up an equation and solve for X, with X representing the amount to give. Page 13 It is important not to forget the rest of the client’s weight, which in this example is49 lb. So 49 lb + 0.1 lb = 49.1 lb. For example, the client’s weight is 49.1 lb. Determine this client’s weight in kg. (Round to the tenth.) STEP 6: What is the unit of measurement you need to calculate?kg STEP 7: Set up an equation and solve for X, with X representing the amount of kg. 2.2lb _ Client's weightinIb 1kg ~ & kg 2.2lb _ 49.11b 1kg ~ Xkg Cross multiply and solve for X. X = 22.318 STEP 8: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. For the purpose of this module, we will round to the tenth. Therefore, 22.318rounds to 12.3. STEP 9: Reassess to determine if the equivalent makes sense. If 1 kg = 2.2 lb, it makes sense that 49.1 lb = 22.3 kg. For example, the provider has prescribed ampicillin 100 mg/kg/day PO divided in doses every 6 hr. The client’s weight is 22.3 kg. What is the single dose of medication you would administer? (Round to the tenth.) STEP 10: What is the unit of measurement you need to calculate? mg STEP 11: Set up an equation and solve for X, with X representing the amount of milligrams. mg x kg / day 100 mg x 22.3 kg = 2,230 mg/day X=2,230 STEP 10: What is the unit of measurement you need to calculate? mg Page 14 STEP 11: Set up an equation and solve for X, with X representing the amount of mg.mg x kg / day 100 mg x 22.3 kg = 2,230 mg/day X=2,230 STEP 12: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. In this example, there is no reason to round your answer because it is already rounded to a whole number. STEP 13: Reassess to determine if it makes sense. If the provider prescribes 100 mg/kg/day and the client weighs 22.3 kg, it makes sense that the client will receive 2,230 mg/day. STEP 14: Divide into individual dosages. This example the provider prescribed divided doses every 6 hours. 2,230 / 4 = 557.5 mg/dose. STEP 15: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. In this example, there is no reason to round your answer because it is already rounded to the tenth. STEP 16: Reassess to determine if it makes sense. If the client is to receive 2,230 mg/day and it is divided into 4 doses, it makessense that the client will receive 557.5 mg/dose. Page 16 X=11.15mL STEP 23: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. In this example, 11.15 rounds to 11.2. STEP 24: Reassess to determine if the amount given makes sense. In this example, the prescribed dose is 557.5 mg. The medication is available as 250 mg/5 mL, so it makes sense that the dose is 11.2 mL. You should administer 11.2 mL PO every 6hr. CALCULATINGAMOUNT OF MEDICATION STEP OUTLINE VIEW For example, a provider has prescribed valproic acid (Depacon) 30 mg/kg/day IV divided in equal doses every 12 hr. The client’s weight is 109 lb 7 oz. How many mewill you administer per dose? (Round to the tenth.) STEP 1: What is the unit of measurement you need to calculate?lb STEP 2: Set up an equation and solve for X, with X representing the amount of kg. 160z _ Client's weight inoz lb ~ x Ib 16 0z - 7Oz (Ib % Ib Cross multiply and solve for X. X = 0.4375 STEP 3: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. For the purpose of this module, we will round to the tenth. Therefore, 0.4375rounds to 0.4. STEP 4: Reassess to determine if the equivalent makes sense. If 1 lb = 16 oz, it makes sense that 7 oz = 0.4 lb. STEP 5: Remember to add the remainder weight. It is important not to forget the rest of the client’s weight, which in this example is109 lb. So 109 lb + 0.4 lb = 109.4 lb. The client’s weight is 109.4 lb. Determine this client’s weight in kg. (Round to the tenth.) STEP 6: What is the unit of measurement you need to calculate?kg Page 17 STEP 7: Set up an equation and solve for X, with X representing the amount of kg. 2.2lb _ Client's weightinIb ikg ~ x kg 2.21b _ 109 41b ikg ~ kg Cross multiply and solve for X. X = 49.727 STEP 8: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. For the purpose of this module, we will round to the tenth. Therefore, 49.727rounds to 49.7. STEP 9: Reassess to determine if the equivalent makes sense. If 1 kg = 2.2 lb, it makes sense that 109.4 lb = 49.7 kg. The provider has prescribed valproic acid (Depacon) 30 mg/kg/day IV divided in equal doses every 12 hr. The client’s weight is 49.7 kg. What is the single dase of medication you would administer? (Round to the tenth.) STEP 10: What is the unit of measurement you need to calculate? mg STEP 11: Set up an equation and solve for X, with X representing the amount of mg.mg x kg / day 30 mg x 49.7 kg = 1,491 mg/day X=1,491 STEP 12: Round if necessary, using general rounding rules. Check with your facility. There are policies and procedures in place for this calculation method. In this example, there is no reason to round your answer because it is already rounded to a whole number. STEP 13: Reassess to determine if it makes sense. If 30 mg/kg/day and the client weighs 49.7 kg, it makes sense that the client will receive 1,491 mg/day. STEP 14: Divide into individual dosages. This example the provider prescribed divided doses every 12 hr. 1,491 / 2 = 745.5 mg/dose. STEP 15: Round if necessary, using general rounding rules. Check with your facility. There are policies and procedures in place for this calculation method. Page 19 500 mg STEP 20: What dose do you need? Dose needed = Desired. 745.5 mg STEP 21: Do you need to use the conversion factor? No STEP 22: Set up an equation and solve for X, with X representing the amount togive. yx = Quantity ,_Conversion(Have) _. Desired ~ Have Conversion (Desired) 5mL 148 5mq 500mg __omL_, (45.5 Rg XmL= sang X=7.455 xmbL= STEP 23: Round if necessary, using general rounding rules. You should also follow policies and procedures of your facility. In this example, 7.455 rounds to 7.5. STEP 24: Reassess to determine if the amount given makes sense. In this example, the prescribed dose is 745.5 mg. The medication is available as300 mg/5 mL, so it makes sense that the dose is 7.5 mL. You should administer 7.5 mL intravenous every 12 hr. CALCULATING SAFE DOSAGES STEP OUTLINE VIEW For example, the provider prescribes ampicillin 200 mg IV every 6 hr to a client who has a respiratory tract infection. Your client weighs 26 kg. What is the safe dosage range for this client? Is this a safe dose to administer? Ampicillin Infections of the respiratory tract and soft tissues. Clients weighing 40 kg or more: 250 to 500 mg every 6 hr. Clients weighing less than 40 kg: 25 to 50 mg/kg/day in equally divided doses every 6 to8 hr. STEP 1: Look up the recommended dosage. The recommended dosage for this example is 25 to 50 mg/kg/day in equally divided doses every 6 to 8 hr. STEP 2: Convert the client’s weight to kg. 26 kg STEP 3: Multiply the client’s weight by both the lower and upper recommended Page 20 dosage range. 26 kg x 25 mg = 650 mg/day 26 kg x 50 mg = 1,300 mg/day 650 to 1,300 mg/day = recommended dosage for this client. STEP 4: Determine the client’s prescribed dosage. The client is receiving 200 mg/6 hr.200 mg x 4= 800 mg/day STEP 5: Evaluate if the prescribed dosage falls within the recommended dosage range. The recommended dosage range is 650-1,300 mg/day. 800 mg/day falls within the range. Therefore, administering 200 mg/6 hr = safe dose. CALCULATING SAFE DOSAGES STEP OUTLINE VIEW For example, the provider prescribes vancomycin 500 mg PO every 8 hr toa child. Your client weighs 18.2 kg. What is the safe dosage range for this client? Is this a safe dose to administer? Vancomycin Children PO 40 mg/kg/day in equally divided doses every 6 to 8 hr for 7 to 10 days; max dosage is2 g/day. STEP 1: Look up the recommended dosage. The recommended dosage for children: Oral 40 mg/kg/day 3 or 4 doses for 7 to 10 days Maximum dosage of 2 g/day STEP 2: Convert the client's weight to kg. 18.2 kg STEP 3: Multiply the client's weight by both the lower and upper recommended dosage range. 18.2 kg x 40 mg = 728 mg/day 2g =2,000 mg 728 to 2,000 mg/day STEP 4: Determine the client’s prescribed dosage. The client is receiving 500 mg/8 hr 500 mg x 3= 1,500 mg/day STEP 5: Evaluate if the prescribed dosage falls within the recommended dosage range. The recommended dosage range is 728-2,000 mg/day. 1,500 mg/day falls within the range. Therefore, administering 500 mg/8 hr to this client is a safe dose. CONVERTING UNITS STEP OUTLINE VIEW For example, you are preparing to administer haloperidol (Haldol) 1 mg PO every 12 hr for aclient. You have on hand 0.5 mg/tab, and you must decide how many tablets 
