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Clark's rule


Clark's rule

Postby admin » Tue Jan 23, 2018 4:09 pm

Clark's rule is a medical term referring to a mathematical formula used to calculate the proper dosage of medicine for children aged 2–17. The procedure is to take the child's weight in pounds, divide by 150 lb, and multiply the fractional result by the adult dose to find the equivalent child dosage.

For example: If an adult dose of medication calls for 30 mg and the child weighs 30 lb. Divide the weight by 150 (30/150) to get 1/5. Multiply 1/5 times 30 mg to get 6 mg.

Clark's rule is not used clinically, but it is a popular dosage calculation formula for pediatric nursing instructors.

Similar to Clark's rule is Fried’s rule, by which the formula is modified to be used for infants. The formula is nearly identical, except with the child's weight replaced by the infant's age in months.

Young's rule is for calculating the dose of medicine correct for a child by adding 12 to the child's age, dividing the sum by the child's age, then dividing the adult dose by the figure obtained.

The formula was named after Dr. Cecil Belfield Clark (1894–1970), a Barbadian Physician who served in London Boroughs for 50 years and was an early advocate for homosexuality rights.

Fried's Rule was named after Dr. Kalman Fried (1914–1999), an Israeli Geneticist and Pediatrician who developed his own formula while treating and observing children at the University of Jerusalem affiliated Hospital - Hadassah Medical Center in the 1960's. Dr. Fried though was more renowned as a Geneticist rather than a Pediatrician.

Young's Rule was named after Dr. Thomas Young, an English physician and physicist, born June 13, 1773, Milverton, Somerset; died May 10, 1829, London.
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