Skip to Content

Allen test

Pronunciation: al'en

Definition:

  1. for phenol: on the addition of 5 or 6 drops of hydrochloric acid and then 1 of nitric acid to the suspected fluid, a red color develops;
  2. for strychnine: fluid is extracted with ether, which is then evaporated by means of “drop-by-drop” pipetting into a warmed porcelain dish or crucible; the residue is treated with drops of manganese dioxide and dilute sulfuric acid; a red-blue or violet color develops if strychnine is present.
  3. a test for radial or ulnar patency; either the radial or ulnar artery is digitally compressed by the examiner after blood has been forced out of the hand by clenching it into a fist; failure of the blood to diffuse into the hand when opened indicates that the noncompressed artery is occluded.

[A.H. Allen]

Disclaimer: This site is designed to offer information for general educational purposes only. The health information furnished on this site and the interactive responses are not intended to be professional advice and are not intended to replace personal consultation with a qualified physician, pharmacist, or other healthcare professional. You must always seek the advice of a professional for questions related to a disease, disease symptoms, and appropriate therapeutic treatments.
© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
Hide