Ordering Recommendation

Aids in management of individuals treated with interferon beta.




Cell Culture/Chemiluminescent Immunoassay




1-15 days

New York DOH Approval Status

This test is New York DOH approved.

Specimen Required

Patient Preparation

Collect specimens before Interferon beta treatment, or more than 48 hours following the most recent dose. Patient should not be on steroid therapy in excess of 10 mg prednisolone (or equivalent) daily. High endogenous levels of Interferon beta, alpha, or gamma may interfere with this assay.


Serum separator tube.

Specimen Preparation

Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.3 mL)

Storage/Transport Temperature


Unacceptable Conditions

Contaminated, hemolyzed, icteric, or lipemic specimens.


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

Reference Interval

Available Separately
Reference Interval
Interferon Beta Screen Negative
Interferon Beta Titer Less than 20: Negative
20 to 99: Moderate levels of neutralizing antibodies present
100 or greater: High levels of neutralizing antibodies present

Interpretive Data

A titer of 20 to 99 suggests moderate levels of neutralizing antibodies present. A titer of 100 or greater suggests high levels of neutralizing antibodies present. Either case warrants continued patient monitoring. The titer is reported as the reciprocal of the dilution of patient serum that reduces the interferon activity by 10 fold.

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)


If Interferon Beta Neutralizing Antibody screen result is positive, then Interferon Beta Neutralizing Antibody titer will be added. 

This test is performed pursuant to an agreement with Biomonitor.

Hotline History


CPT Codes

86352; if reflexed, add 86352


Component Test Code* Component Chart Name LOINC
2003391 Interferon Beta Neutralizing Ab Screen 29647-5
2003392 Interferon Beta Neutralizing Ab Titer 35139-5
* 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.


  • iLite
  • Interferon-Beta
  • NAb
  • NabFeron
  • Neutralization
Interferon Beta Neutralizing Antibody with Reflex to Titer