This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in

Investigations

Authoring team

In classic phenylketonuria:

  • blood phenylalanine concentration - normal at birth but rises thereafter (more rapidly in males). Blood screening for phenylalanine identifies most cases at the age of 1 week; urinary analysis at this stage is less accurate. Concentrations of many other amino acids in the blood are generally significantly reduced

  • phenylalanine challenge - this is contraindicated in patients with known phenylketonuria - if this is undertaken then plasma tyrosine does not rise

Create an account to add page annotations

Add information to this page that would be handy to have on hand during a consultation, such as a web address or phone number. This information will always be displayed when you visit this page

The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

Connect

Copyright 2024 Oxbridge Solutions Limited, a subsidiary of OmniaMed Communications Limited. All rights reserved. Any distribution or duplication of the information contained herein is strictly prohibited. Oxbridge Solutions receives funding from advertising but maintains editorial independence.