Clark's Rule and Young's Rule Flashcards

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Questions and Answers

What is the formula for Clark's rule?

  • Child's dose = Adult Dose x [weight of child (lbs) / 150] (correct)
  • Child's dose = Adult Dose x [weight of child (kg) / 100]
  • Child's dose = Adult Dose x [Age / 100]
  • Child's dose = Adult Dose x [Age / (Age + 12)]

Using Clark's rule, what is the dose for a 12-year-old girl who weighs 31.7kg if the average adult dose is 500mg?

235mg

Using Clark's rule, what dose should be given to an 8-year-old child who weighs 57lbs if the adult dose is 250mg?

95mg

What is the formula for Young's rule?

<p>Child's dose = Adult Dose x [Age / (Age + 12)] (A)</p> Signup and view all the answers

What dose should be given to a 9-year-old child who weighs 63lbs using Young's rule if the adult dose is 200mg?

<p>86mg</p> Signup and view all the answers

Write down the equations for Young's rule and Clark's rule.

<p>Clark's rule: Adult dose x [weight of child (lbs) / 150 ] = Child's dose; Young's rule: Child's dose = Adult Dose x [Age / (Age + 12)]</p> Signup and view all the answers

Using Clark's rule, what is the dose for an 11-year-old boy who weighs 35.2kg if the average adult dose is 400mg?

<p>206mg</p> Signup and view all the answers

If the adult dose is 100mg and a 7-year-old child weighs 40kg, what dose should the child be given using Young's rule?

<p>37mg</p> Signup and view all the answers

What dose should Sam be administered if he is six times younger than a 42-year-old adult weighing 164lbs who is given 500mg of a drug?

<p>184mg</p> Signup and view all the answers

Which formula was used to prescribe a 10-year-old boy weighing 32kg an antibacterial drug at 35mg when the adult dose is 75mg?

<p>Clark's rule</p> Signup and view all the answers

Flashcards

Clark's Rule Formula

Child's dose = Adult Dose x [weight of child (lbs) / 150]

Young's Rule Formula

Child's dose = Adult Dose x [Age / (Age + 12)]

Clark's and Young's Rules

Adult dose x [weight of child (lbs) / 150 ] = Child's dose; Young's rule: Child's dose = Adult Dose x [Age / (Age + 12)]

Clark's Rule

To calculate a safe dosage for a 10 year old boy using the formula: Adult dose x [weight of child (lbs) / 150 ] = Child's dose

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Study Notes

Clark's Rule

  • Formula: Adult dose x [weight of child (lbs) / 150] = Child's dose
  • Requires child's weight in pounds; convert kg to lbs by multiplying by 2.2.
  • Example calculation with 12-year-old girl weighing 31.7 kg results in a dose of 235 mg using an adult dose of 500 mg.

Young's Rule

  • Formula: Child's dose = Adult Dose x [Age / (Age + 12)]
  • Uses age as the basis for calculation instead of weight.
  • Example calculation for a 9-year-old child yielding a dose of 86 mg with an adult dose of 200 mg.

Application of Rules

  • 8-year-old child weighing 57 lbs and an adult dose of 250 mg gives a prescribed dose of 95 mg via Clark's rule.
  • 11-year-old boy weighing 35.2 kg with a 400 mg adult dose results in a child dose of 206 mg under Clark's rule.

Conversion and Comparison

  • Convert kg to lbs before using Clark's rule; Young's rule does not require conversion.
  • In case of a pediatric patient who weighs 40 kg and is 7 years old, Young's rule results in a dose of 37 mg from an adult dose of 100 mg.

Special Cases

  • Sam, a patient who is six times younger than a 42-year-old adult weighing 164 lbs receiving 500 mg, is prescribed a dose of 184 mg.
  • A 10-year-old boy weighing 32 kg and prescribed 35 mg was calculated using Clark's rule; Young's rule would yield a lower dose of 33.75 mg.

Summary of Equations

  • Clark's Rule: Adult dose x [weight of child (lbs) / 150] = Child's dose
  • Young's Rule: Child's dose = Adult Dose x [Age / (Age + 12)]

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