Test Information

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Diphtheria Antibody IgG

Test Code: 922

Cpt Code:

86001 (x1)

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.

Assay Range

0.01-7.50 IU/mL

Turnaround Time

Setup: Mon and Thur. TAT 2-3 business days from receipt of specimen

Specimen Information

serum - NY approved. 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-IBT's 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-IBT assumes no responsibility for billing errors due to reliance on the CPT codes illustrated in this material.


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Kilpatrick DC. Transfusion Medicine 2002; 121: 335-351.

Akira S et al. Nature Immunol 2002; 2: 675-680.

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