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Diphtheria Antibody IgG

Test Code: 922
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Clinical and Procedure
Clinical Utility

A common method for evaluating suspected antibody deficiency is to immunize the patient with an appropriately selected vaccine, such as Diphtheria, and determine vaccine-specific antibody concentrations in a serum sample 3-4 weeks post-immunization compared to a pre-immunization sample. A normal post-immunization response to these toxins is a 10 to 100-fold increase in antibody concentration compared to the pre-immunization sera. The recommended protective level of Diphtheria antitoxin IgG is greater than or equal to 0.10 IU/mL.


The toxin isolated from Corynebacterium diphtheriae is used as a solid phase antigen in a sensitive microtiter EIA. The EIA is calibrated by reference to the WHO International Reference Diphtheria anti-toxin lot NIBSC 00/496. This test has not been cleared or approved for diagnostic use by the U.S. Food and Drug Administration.

Turnaround Time

2-3 business days from receipt of specimen

Specimen Information
Specimen Type Order Code CPT Code NY Approved Volume Assay Range Special Instructions
serum 922 86001 Yes

1 mL (min. 200 uL)

0.01-7.50 IU/mL

  • Collect 1 mL, ambient, no special shipping requirements.

Specimens are approved for testing in New York only when indicated in the Specimen Information field above.

The CPT codes provided are based on Viracor Eurofins' interpretation of the American Medical Association's Current Procedural Terminology (CPT) codes and are provided for general informational purposes only. CPT coding is the sole responsibility of the billing party. Questions regarding coding should be addressed to your local Medicare carrier. Viracor Eurofins assumes no responsibility for billing errors due to reliance on the CPT codes illustrated in this material.


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