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Test ID VEDOL Vedolizumab Quantitation with Reflex to Antibodies, Serum

Ordering Guidance

If both quantitation and antibody testing are needed, regardless of the quantitation results, order VEDOZ / Vedolizumab Quantitation with Antibodies, Serum.

Specimen Required

Patient Preparation:

1. For 12 hours before specimen collection do not take multivitamins or dietary supplements containing biotin (vitamin B7), which is commonly found in hair, skin, and nail supplements and multivitamins.

2. Nivolumab (Opdivo) must be discontinued at least 4 weeks prior to testing for vedolizumab quantitation in serum.



Preferred: Red top

Acceptable: Serum gel

Specimen Volume: 1.5 mL

Collection Instructions:

1. Draw blood immediately before next scheduled dose (trough specimen).

2. Centrifuge within 2 hours of collection.

Useful For

Assessing the response to therapy with vedolizumab


An aid to achieving desired trough serum concentration of vedolizumab

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
VEMAB Vedolizumab Ab, S No No

Testing Algorithm

Vedolizumab quantitation will be performed by liquid chromatography-mass spectrometry on all samples. When this test is ordered and vedolizumab results are 15.0 mcg/mL or less, then testing for antibodies to vedolizumab will be performed at an additional charge.


This test includes vedolizumab drug quantitation and, if appropriate, antibody testing for antibodies-to-vedolizumab will be performed. Currently, the American Gastroenterology Association does not have a formal guideline on optimal thresholds for vedolizumab trough concentrations in the setting of loss of response to therapy, but trough concentrations greater than 12 mcg/mL to 15 mcg/mL have been associated with clinical or endoscopic remission and mucosal healing in inflammatory bowel disease.

Method Name

VEDOL: Liquid Chromatography-Mass Spectrometry (LC-MS/MS)

VEMAB: Electrochemiluminescent Bridging Immunoassay

Reporting Name

Vedolizumab QN, S

Specimen Type


Specimen Minimum Volume

0.75 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 28 days
  Frozen  28 days

Clinical Information

Vedolizumab (Entyvio) is a humanized IgG1 kappa monoclonal antibody directed against integrin alpha-4 beta-7. Blocking the alpha-4 beta-7 integrin results in a gut-selective anti-inflammatory response.(1) The drug is FDA-approved for the treatment of adult patients with moderately to severely active ulcerative colitis or Crohn disease. The main indication for therapeutic drug monitoring of vedolizumab is in the setting of primary nonresponse or loss-of-response to therapy, also called reactive monitoring.(2-10) Vedolizumab trough concentrations greater than 12 mcg/mL to 15 mcg/mL have been associated with clinical or endoscopic remission.(3,5,11) Proactive monitoring of vedolizumab concentrations has been proposed, but there is not sufficient data to support routine proactive testing at this time.


Therapeutic drug monitoring of biologics is usually carried out by measuring the monoclonal antibody therapy concentration and assessing its immunogenicity or the appearance of anti-drug antibodies. Some patients on vedolizumab may develop antibodies to vedolizumab (ATV) over time. In clinical trials, approximately 4% of patients treated with vedolizumab were positive for ATV at any time and 1% or less were persistently positive. Clinically significant ATV impact drug clearance and a positive ATV is associated with lower trough concentrations of vedolizumab.

Reference Values


Vedolizumab lower limit of quantitation: 2.0 mcg/mL



Antibodies to vedolizumab: <9.8 ng/mL


The limit of quantitation of the test is 2.0 mcg/mL. In a retrospective Mayo Clinic study with 171 patients (62% Crohn disease, 31% ulcerative colitis, and 7% indeterminate colitis), the median vedolizumab trough concentration was 15.3 mcg/mL.(11) Trough (immediately before next infusion) therapeutic concentrations of vedolizumab are expected to be above 15 mcg/mL.


Vedolizumab concentration greater than 15 mcg/mL at trough is associated with clinical remission, endoscopic remission, or mucosal healing in inflammatory bowel disease.


Clinically significant antibodies-to-vedolizumab impact drug clearance and are associated with low (≤15 mcg/mL at trough) or undetectable vedolizumab concentration.

Clinical Reference

1. Feagan BG, Rutgeerts P, Sands BE, et al: Vedolizumab as induction and maintenance therapy for ulcerative colitis. N Engl J Med. 2013 Aug 22;369:699-710

2. Williet N, Boschetti G, Fovet M, et al: Association between low trough levels of vedolizumab during induction therapy for inflammatory bowel diseases and need for additional doses within 6 months. Clin Gastroenterol Hepatol. 2017 Nov;15(11):1750-1757.e3

3. Dreesen E, Verstockt B, Bian S, et al: Evidence to support monitoring of vedolizumab trough concentrations in patients with inflammatory bowel diseases. Clin Gastroenterol Hepatol. 2018 Dec;16(12):1937-1946 e8

4. Ungar B, Kopylov U, Yavzori M, et al: Association of vedolizumab level, anti-drug antibodies, and alpha4beta7 occupancy with response in patients with inflammatory bowel diseases. Clin Gastroenterol Hepatol. 2018 May;16(5):697-705.e7

5. Ward MG, Sparrow MP, Roblin X: Therapeutic drug monitoring of vedolizumab in inflammatory bowel disease: Current data and future directions. Therap Adv Gastroenterol. 2018 May 8;11:1756284818772786

6. Pouillon L, Rousseau H, Busby-Venner H, et al: Vedolizumab trough levels and histological healing during maintenance therapy in ulcerative colitis. J Crohns Colitis. 2019 Aug 14;13(8):970-975

7. Pouillon L, Vermeire S, Bossuyt P: Vedolizumab trough level monitoring in inflammatory bowel disease: A state-of-the-art overview. BMC Med. 2019 May 8;17(1):89

8. Singh S, Dulai PS, Vande Casteele N, et al: Systematic review with meta-analysis: Association between vedolizumab trough concentration and clinical outcomes in patients with inflammatory bowel diseases. Aliment Pharmacol Ther. 2019 Oct;50(8):848-857

9. Ungaro RC, Yarur A, Jossen J, et al: Higher trough vedolizumab concentrations during maintenance therapy are associated with corticosteroid-free remission in inflammatory bowel disease. J Crohns Colitis. 2019 Aug 14;13(8):963-969

10. Yarur AJ, Bruss A, Naik S, et al. Vedolizumab concentrations are associated with long-term endoscopic remission in patients with inflammatory bowel diseases. Dig Dis Sci. 2019 Jun;64(6):1651-1659

11. Al-Bawardy B, Ramos GP, Willrich MAV, et al. Vedolizumab drug level correlation with clinical remission, biomarker normalization, and mucosal healing in inflammatory bowel disease. Inflamm Bowel Dis. 2019 Feb 21;25(3):580-586

Day(s) Performed

Monday, Thursday

Report Available

5 to 7 days

Test Classification

This test was developed, and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information


82397 (if appropriate)

LOINC Code Information

Test ID Test Order Name Order LOINC Value
VEDOL Vedolizumab QN, S 90805-3


Result ID Test Result Name Result LOINC Value
602807 Vedolizumab QN, S 90805-3


If not ordering electronically, complete, print, and send 1 of the following with the specimen:

-Gastroenterology and Hepatology Client Test Request (T728)

-Therapeutics Test Request (T831)