We're unable to sign you in at this time. Please try again in a few minutes.
We were able to sign you in, but your subscription(s) could not be found. Please try again in a few minutes.
There may be a problem with your account. Please contact the AMA Service Center to resolve this issue.
Contact the AMA Service Center:
Telephone: 1 (800) 262-2350 or 1 (312) 670-7827  *   Email: subscriptions@jamanetwork.com
Error Message ......
Article |

Use of the Nitro Blue Tetrazolium Test in Clinical Pediatrics

Am J Dis Child. 1974;128(4):449-451. doi:10.1001/archpedi.1974.02110290019003.
Text Size: A A A
Published online


The rediscovery in 1966 that phagocytizing leukocytes reduce soluble yellow nitro blue tetrazolium (NBT) to an insoluble purple formazan led to the design of tests to more accurately quantitate this observation.1 As is often the case, the initial observation of this unique response was reported in 19532 but ignored for more than a decade. Those who wish to observe NBT reduction by phagocytizing leukocytes will be both delighted and intrigued by it. The procedure is simple: a drop of anticoagulated, leukocyte-rich plasma removed from a sedimented sample of whole blood is placed on a glass slide containing a drop of NBT dissolved in normal saline and both are mixed with a suspension of ingestable particles, eg, zymosan.3 Shortly after the phagocyte reaches the particle, a violaceous color appears precisely at that point of contact. As the particle becomes entrapped within the cell, a deep purple precipitate develops


Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?

First Page Preview

View Large
First page PDF preview





Also Meets CME requirements for:
Browse CME for all U.S. States
Accreditation Information
The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
Note: You must get at least of the answers correct to pass this quiz.
Please click the checkbox indicating that you have read the full article in order to submit your answers.
Your answers have been saved for later.
You have not filled in all the answers to complete this quiz
The following questions were not answered:
Sorry, you have unsuccessfully completed this CME quiz with a score of
The following questions were not answered correctly:
Commitment to Change (optional):
Indicate what change(s) you will implement in your practice, if any, based on this CME course.
Your quiz results:
The filled radio buttons indicate your responses. The preferred responses are highlighted
For CME Course: A Proposed Model for Initial Assessment and Management of Acute Heart Failure Syndromes
Indicate what changes(s) you will implement in your practice, if any, based on this CME course.


Some tools below are only available to our subscribers or users with an online account.

0 Citations

Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?

Related Content

Customize your page view by dragging & repositioning the boxes below.