Ordering Recommendation

Evaluate the ability of a patient to produce antibody to pure protein vaccine after vaccination to rule out antibody deficiency.




Quantitative Multiplex Bead Assay




1-3 days

New York DOH Approval Status

This test is New York DOH approved.

Specimen Required

Patient Preparation

Serum separator tube. "Pre" and "post" vaccination specimens should be submitted together for testing. "Post" specimen should be drawn 30 days after immunization.

Specimen Preparation

Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.15 mL) Mark specimens clearly as "Pre-Vaccine" or "Post-Vaccine". If shipped separately, "Post" specimen must be received within 60 days of "Pre" specimen.

Storage/Transport Temperature


Unacceptable Conditions

Plasma or other body fluids.


After separation from the cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)

Reference Interval

Antibody concentration of  > 0.1 IU/mL is usually considered protective.

Interpretive Data

Responder status is determined according to the ratio of a one-month post-vaccination specimen to pre-vaccination concentration of diphtheria IgG antibody as follows:

1.  If the post-vaccination concentration is less than 1.0 IU/mL, the patient is considered a nonresponder.
2.  If the post-vaccination concentration is greater than or equal to 1.0 IU/mL, a patient with a ratio of less than 1.5 is a nonresponder, a ratio of 1.5 to less than 3.0, is a weak responder, and a ratio of 3.0 or greater, is a good responder.
3.  If the pre-vaccination concentration is greater than 1.0 IU/mL, it may be difficult to assess the response based on a ratio alone.  A post-vaccination concentration above 2.5 IU in this case is usually adequate.

This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.

Compliance Category

Laboratory Developed Test (LDT)


Hotline History


CPT Codes



Component Test Code* Component Chart Name LOINC
0050210 Diphtheria Antibody, IgG 13227-4
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.


  • Corynebacterium diphtheriae Antitoxin
  • Diphtheria Antitoxoid
  • Diptheria Vaccine Response
Diphtheria Antibody, IgG