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Pharmacology ATI Chapter 3; Dosage Calculation Exam/16 Complete Questions & Answers
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Pharmacology ATI Chapter 3; DosageCalculation Exam/16 Complete Questions &
Answers
Types of calculation - --Solid Oral
-Liquid Oral
-Injectable medication
-Correct Doses by Weight
-IV infusion rate
-Standard Conversion Factors - -1mg = 1000mcg
1g = 1000mg
1kg = 1000g
1oz = 30mL
1L = 1000mL
1tsp = 5mL
1tbsp = 3tsp
1kg = 2.2lb
1gr(grain) = 60mg
1in = 2.54cm
-General Rounding Guidelines; Dosage over 1.0 - -Round to the nearest
tenth
0.5 or higher round Up
0.4 or lower round Down
-1.45 = 1.5
-1.44 = 1.4
-Rounding Dosage under 1.0 - -Round to the nearest hundreth
-0.746 = 0.75
-0.743 = 0.74
-Ratio and Proportion example: Solid Dosage
-Nurse is preparing to give phenytion 0.2g PO every 8hr. Amount available is
100mg/capsule. How many capsules should be given? - -Desired amount
(desired) = 0.2g
Dose available (have) = 100mg
Unit conversion needed? Yes
-1g = 1000mg (1 x 1000)
-0.2g x 1000mg = 200mg
Quantity of the dose available (Quantity)= 100mg per 1 capsule
Equation:
- Have/qantity = Desired/x
- 100mg/1 cap = 200mg/x cap (Cross multiply)
, - x = 2 capsules
-Desired over Have example: Solid Dosage
-Nurse is preparing to give phenytion 0.2g PO every 8hr. Amount available is
100mg/capsule. How many capsules should be given? - -Desired amount
(desired) = 0.2g
Dose available (have) = 100mg
Unit conversion needed? Yes
-1g = 1000mg (1 x 1000)
-0.2g x 1000mg = 200mg
Quantity of the dose available (Quantity)= 100mg per 1 capsule
Equation:
-Desired x Quantity/Have = X cap
-200mg x 1 cap/100mg = X (multiply then divide)
-X = 2 capsules
-Ratio and proportion example: Liquid Dosage
-Nurse is preparing to administer amoxicillin 0.25g PO every 8hr. Available
oral suspension is 250mg/5mL. How many mL should be administered? - -
Desired amount (desired) = 0.25g
Dose available (have) = 250mL
Unit conversion needed? Yes
- 1g = 1000mg (1 x 1000)
- 0.25g = 250mg (0.25 x 1000)
Quantity of the dose available (Quantity) = 5mL
Equation:
-Have/Quantity = Desired/X mL
-250mL/5mL = 0.25g/X mL (Cross Multiply)
- X = 5mL
-Desired over Have: Liquid Dosage
-Nurse is preparing to administer amoxicillin 0.25g PO every 8hr. Available
oral suspension is 250mg/5mL. How many mL should be administered? - -
Desired amount (desired) = 0.25g
Dose available (have) = 250mL
Unit conversion needed? Yes
- 1g = 1000mg (1 x 1000)
- 0.25g = 250mg (0.25 x 1000)
Quantity of the dose available (Quantity) = 5mL
Equation:
-Desired x Quantity/Have = X
-0.25g x 5mL/250mg = X (Multiply then Divide)
- X = 5mL
-Ratio and Proportion Example: Injectable Dose
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