Questions and Answers
What volume is required for an injection if 500 mg are ordered and stock ampules contain 250 mg/ml?
2 ml
What volume is required for an injection if 600 mg are ordered and stock ampules contain 350 mg/ml?
1.71 ml
What volume is required for an injection if 750 mg are ordered and stock ampules contain 200 mg/ml?
3.75 ml
What volume will you give a patient if a dose of 2 g of medication is ordered and the medication comes in 4 g/0.4 mL?
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What volume will you give a patient if a dose of 4500 mg of medication is ordered and the medication comes in 5 g/0.3 mL?
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What volume will you give a patient if a dose of 3500 mg of medication is ordered and the medication comes in 5 g/2 mL?
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How many DPM is required for a flask of 1.5 L of 0.9% saline over 8 hrs with a DF of 20?
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How many DPM is required for a flask of 1 L of 4% dextrose in saline over 6 hrs with a DF of 15?
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How many DPM is required for a flask of 850 mL of 0.9% saline over 12 hrs with a DF of 60?
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What volume will you give a child weighing 13.5 kg prescribed a medication for 0.8 mg/kg/dose, with a stock strength of 10 mg/2 mL?
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What volume will you give a patient weighing 45 kg prescribed a medication for 3 mg/kg/dose, with a stock strength of 2 mg/0.5 mL?
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What volume will you give a patient weighing 16.5 kg prescribed a medication for 0.4 mg/kg/dose, with a stock strength of 20 mg/5 mL?
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How many mg would you administer per dose if a 13 kg child is ordered a medication for 2.5 mg/kg/day with 3 doses per day?
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How many mg would you administer per dose if a 3.4 kg child is ordered a medication for 5 mg/kg/day with 4 doses per day?
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How much will you give a 3800 g infant ordered a medication for 0.6 mg/kg/day over 6 doses per day?
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How many mL per minute would you administer if a patient needs 1 mg of a medication mixed with 10 mL of water over 3 minutes?
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How many mL per minute would you administer if a patient needs 2 mg of a medication mixed with 10 mL of water over 3 minutes?
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How many mL per minute would you administer if a patient needs 4 mg of a medication mixed with 10 mL of water over 5 minutes?
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How many mg will you give per dose for a child weighing 15 kg prescribed with a medication dose of 2 mg/kg/day in equal doses every 4 hours?
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How many mg will you give per dose for a patient weighing 3 kg prescribed a medication with a dose of 0.1 mg/kg/day in equal doses every 8 hours?
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How many mg will you give per dose for a patient weighing 6.5 kg prescribed a medication with a dose of 0.5 mg/kg/day in equal doses every 12 hours?
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How many mg per mL will be infused for a solution of 350 mg of a medication in 100 mL of saline? (Round to one decimal place)
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How many mg per mL will be infused for a solution of 400 mg of a medication in 300 mL of saline? (Round to one decimal place)
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How many mg per mL will be infused for a solution of 550 mg of a medication in 200 mL of saline?
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Study Notes
Medication Dosage Calculations
- Volume required for injection can be calculated by dividing the ordered dosage by the concentration of the stock solution.
- For instance, 500mg ordered with 250mg/ml stock requires 2ml (500mg / 250mg/ml).
- Similarly, for 600mg with 350mg/ml, the volume needed is approximately 1.71ml (600mg / 350mg/ml).
- An order of 750mg with stock of 200mg/ml requires 3.75ml (750mg / 200mg/ml).
- A 2g dose in a stock of 4g/0.4ml equals 0.2ml of medication (2g / (4g/0.4ml)).
- For 4500mg ordered and stock of 5g/0.3ml, the calculated volume is 0.27ml (4500mg / (5g/0.3ml)).
- A patient prescribed 3500mg with stock of 5g/2ml requires 1.4ml (3500mg / (5g/2ml)).
Infusion Rate Calculations
- To calculate DPM (drops per minute), first determine the total volume to be infused, then apply the dilution factor (DF).
- A flask of 1.5L (1500ml) of 0.9% saline over 8 hours with a DF of 20 results in 50 DPM (1500ml / 480min * 20).
- For a 1L flask of 4% dextrose over 6 hours at DF of 15, the rate is 62.5 DPM.
- An 850ml 0.9% saline over 12 hours with DF of 60 results in 71.25 DPM.
Weight-Based Medication Dosing
- Dosages based on weight utilize mg/kg calculations to establish required volumes and doses.
- A child weighing 13.5kg prescribed 0.8mg/kg/dose needs 1.08ml (10mg/2ml).
- For a 45kg patient with 3mg/kg/dose, the required volume is 7.5ml (2mg/0.5ml).
- A 16.5kg patient needing 0.4mg/kg/dose would receive 0.4ml (20mg/5ml).
- A 13kg child on 2.5mg/kg/day will get 32.5mg per day, administered per dose based on the number of doses.
- A 3.4kg child requiring 5mg/kg/day will receive 17mg per day split into 4 doses.
IV Bolus Administration
- For IV medication preparation, dosing calculations involve adjusting final volumes and flow rates.
- 1mg requires 10ml, administered over 3 minutes gives a rate of 3.33ml/min.
- 2mg mixed the same way is administered at 6.67ml/min over 3 minutes.
- For a 4mg dose over 5 minutes, the rate translates to 8ml/min.
General Medication Concentration Calculations
- Determining concentration involves dividing the total medication by total volume.
- A solution with 350mg in 100ml equates to 3.5mg/ml.
- A solution with 400mg in 300ml results in 1.33mg/ml.
- For 550mg in 200ml, concentration is 2.75mg/ml.
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Description
Test your skills in calculating medication dosages with this quiz. You'll learn how to determine the volume required for various injections using provided ordered dosages and stock concentrations. Ideal for nursing and pharmacy students looking to sharpen their calculation abilities.
