welcome back in this video we'll explore three methods for Pediatric dosage calculations Fred's rule Young's Rule and Clark's rule we'll use the same problem to see how each rule works and compare their results pediatric dosage calculations require Precision each rule we discuss today has its own context for use Fred's rule is typically used for infants Young's Rule for older children and Clark's rule for weight-based calculations here's our common problem a 15-month-old infant weighing 20 PBS needs a dosage calculation for streptomycin sulfate the adult dosage is 1,000 Mig daily let's see how each rule calculates the pediatric dose first fried's rule this rule uses the child's age and months the formula is pediatric dose equals age and months divided by 150 time adult dose let's calculate it pediatric dose equals 15 divided 150 * 1,000 mg which equals 100 mg Freeds rule is particularly useful for infants and younger children because it uses their age in months providing more granularity for dosage calculations at this early stage of Life Next Young's Rule this rule uses the child's age in years for older children this provides a simpler calculation the formula is pediatric dose equals age in years / age + 12 time the adult dose for the problem first let's convert the age to convert months to years divide the number of months by 12 for example 15 months ID 12 equals 1.25 years now apply the formula pediatric dose equals 1.25 / 1.25 + 12 * 1,000 mg which equal 94 mg as compared to Fred's rule Young's Rule is often used for older children making it a practical Choice once children are over a year old and their dosages can be calculated based on years rather than months lastly Clark's rule this rule is based on the child's weight in pounds making it very precise the formula is pediatric dose equals weight in pounds / 150 time adult dose hence the pediatric dose equals 20 150 * 1,000 mg which equal 133 mg Clark's rule is particularly useful for weight-based calculations offering a precise dosage based on the child's weight comparing the results fried's rule gave us 100 milligrams Young's Rule gave us 94 milligrams and Clark's rule gave us 133 Mig each method has its use depending on the child's specifics and the medication