The full content of Annals is available to subscribers

Subscribe/Learn More  >
Original Research |

An Evaluation of a Recent Modification of the Watson-Schwartz Test for Porphobilinogen

Ann Intern Med. 1964;60(2_Part_1):306-307. doi:10.7326/0003-4819-60-2-306
Text Size: A A A
This excerpt has been provided in the absence of an abstract.

The diagnosis of acute intermittent porphyria (AIP) is ordinarily made by demonstrating the presence of porphobilinogen (PBG) in freshly passed urine. In 1941 Watson and Scwartz (1) described a simple test for the detection of this substance in the urine. In 1948 Hammond and Welker (2) reported that they were unable to find a single false positive in a thousand urine samples from routine hospital admissions. Because of this the test has been regarded as highly reliable, and the finding of a positive result is looked upon as almost pathognomonic of the disease. However, interpretation of the test may occasionally


First Page Preview

View Large
First page PDF preview





Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).


Submit a Comment/Letter
Submit a Comment/Letter

Summary for Patients

Clinical Slide Sets

Terms of Use

The In the Clinic® slide sets are owned and copyrighted by the American College of Physicians (ACP). All text, graphics, trademarks, and other intellectual property incorporated into the slide sets remain the sole and exclusive property of the ACP. The slide sets may be used only by the person who downloads or purchases them and only for the purpose of presenting them during not-for-profit educational activities. Users may incorporate the entire slide set or selected individual slides into their own teaching presentations but may not alter the content of the slides in any way or remove the ACP copyright notice. Users may make print copies for use as hand-outs for the audience the user is personally addressing but may not otherwise reproduce or distribute the slides by any means or media, including but not limited to sending them as e-mail attachments, posting them on Internet or Intranet sites, publishing them in meeting proceedings, or making them available for sale or distribution in any unauthorized form, without the express written permission of the ACP. Unauthorized use of the In the Clinic slide sets will constitute copyright infringement.


Buy Now for $42.00

to gain full access to the content and tools.

Want to Subscribe?

Learn more about subscription options

Related Articles
Topic Collections
PubMed Articles
Forgot your password?
Enter your username and email address. We'll send you a reminder to the email address on record.