Pronounced: fen-ul-ke-to-NU-re-uh
Phenylketonuria (PKU) is when a person does not have enough of the liver enzyme needed to break down an amino acid called phenylalanine. It can build up and harm the brain.
PKU is caused by a change in the gene that makes the enzyme that breaks down phenylalanine.
The only way to get PKU is to have gotten the gene for it from both parents.
Symptoms depend on how much of the enzyme is made.
Problems may not happen when PKU is found early and treated. If it is not, there may be:
PKU may be found at birth by a blood test that is done by law in all states. The test can also be done at any time. More blood and urine tests are done to confirm PKU.
A doctor who treats genetic problems will be needed. A dietitian will also be needed.
There is no cure. People must stay on a special diet throughout life. Pregnant women with PKU must stay on it to lower the risk of serious birth defects.
The level of phenylalanine in the blood will need to be checked with blood tests. This will help make sure it is in a safe range.
Copyright © Nucleus Medical Media, Inc.
This strict diet lowers phenylalanine to a level that a person with PKU can have without having problems. Its key points are:
Pegvaliase-pqpz or tetrahydrobiopterin may be used to lower phenylalanine levels.
There are no methods to prevent PKU.
Canadian PKU and Allied Disorders
http://canpku.org
Caring for Kids—Canadian Paediatric Society
http://www.caringforkids.cps.ca
Phenylketonuria (PKU) EBSCO DynaMed website. Available at:https://www.dynamed.com/condition/phenylketonuria-pku. Updated June 10, 2019. Accessed September 17, 2019.
Regier DS, Greene CL. Phenylalanine hydroxylase deficiency. GeneReviews 2017 Jan 5.
What is PKU? University of Washington PKU Clinic website. Available at http://depts.washington.edu/pku/about/whatispku.html. Accessed September 17, 2019.
1/21/2014 DynaMed Systematic Literature Surveillancehttp://www.dynamed.com/topics/dmp~AN~T114631/Phenylketonuria-PKU: Lindegren ML, Krishnaswami S, Fonnesbeck C, et al. Adjuvant treatment for phenylketonuria (PKU). Comparative Effectiveness Reviews. 2012;56.
Last reviewed September 2019 by EBSCO Medical Review Board Dianne Rishikof, MS, RDN, LDN, IFNCP Last Updated: 5/1/2020
EBSCO Information Services is fully accredited by URAC. URAC is an independent, nonprofit health care accrediting organization dedicated to promoting health care quality through accreditation, certification and commendation.
This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.
To send comments or feedback to our Editorial Team regarding the content please email us at healthlibrarysupport@ebsco.com. Our Health Library Support team will respond to your email request within 2 business days.