IDEXX Reference Laboratories

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Faecal Dx antigen testing

Detects common and prevalent parasites earlier—even when there are no eggs present.1-5

That's good news for you. Bad news for parasites.

Unlike other faecal testing methods, Faecal Dx antigen testing doesn’t rely on the presence of eggs for an accurate diagnosis. Instead, it detects parasites by their antigen protein. If there are parasites, there will be antigen. Even in prepatent or single-sex infections.

Only from IDEXX Reference Laboratories.

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See how the antigen technology enables early and accurate detection.

Watch our latest video on faecal antigen testing

By testing for antigens rather than relying on the presence of eggs, you can detect earlier and more accurately for hookworm, roundworm, whipworm and – coming soon – flea tapeworm.1,2

Graphic of a worm.
Earlier detection than faecal flotation1–5

Graphic of 5 worms.
Detect up to 5X more infections than faecal flotation alone1,4,6

Find what the microscope misses with Faecal Dx antigen testing2–5

  • Identify infections prior to eggs being shed.
  • Avoid false-negative results caused by intermittent shedding of eggs.
  • Detect worms even if eggs are not present in the faecal sample.

Help protect pets and families like never before

Learn more about the importance of detecting infections early and accurately to treat intestinal parasites effectively, reducing the risk of infections to other pets and family members.7

Learn more about Faecal Dx and antigen testing


See clinical evidence that Faecal Dx antigen testing helps find parasite infections that the microscope misses.

Diagnostic Update

Faecal Dx Antigen Brochure


From infection to presentation: learn how to diagnose hookworm, roundworm, whipworm, and flea tapeworm earlier

Faecal Dx Clinical Reference Guide

Learn more about prevalence of intestinal parasites and view guidelines for diagnosis and control of intestinal parasites

Read a pan-European clinical study that confirms the need to test and treat even well-cared for dogs.

Read the DOGWALKS study


Read guidelines of ESCCAP how to combine faecal testing and treatment with dewormers for effective detection and treatment of intestinal parasites.

ESCCAP Guidelines GL4: Parasitological Diagnosis in Cats, Dogs and Equines

ESCCAP UK Intestinal Nematodes Diagnostic Testing Poster

Read publications on coproantigen testing for nematodes


See clinical evidence on the ability of Faecal Dx antigen testing to identify different types of nematodes in cats and dogs.

Publication Parasitol Research, Jan 2023

Publication J Vet Diagn Invest, Sep 2017

Publication J Vet Diagn Invest, May 2014

Include Faecal Dx antigen testing as part of every faecal examination.

Test codes for faecal testing

For "healthy" dogs and cats:
Faecal Dx Antigen (Immunoassay) (test code FAP)
  • Hookworm, roundworm, whipworm and – coming soon – flea tapeworm antigens by ELISA.

For sick dogs and cats:
Faecal Dx Antigen as add-on to Faecal Screens



IDEXX Faecal Check Home Collection Kit

A convenient solution, the IDEXX Faecal Check Home Collection Kit makes it easy for pet owners to collect and send in their pet's faecal sample to IDEXX for intestinal parasite screening. Product code: 99-0013521
Learn more.

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  1. Elsemore D, Beall M, Bezold T, et al. Detection of Dipylidium caninum coproantigen in experimental and natural infections [AAVP Abstract 23]. Paper presented at: American Association of Veterinary Parasitologists 67th Annual Meeting; June 26, 2022; Snowbird, UT
  2. Elsemore DA, Geng J, Flynn L, Cruthers L, Lucio-Forster A, Bowman DD. Enzyme-linked immunosorbent assay for coproantigen detection of Trichuris vulpis in dogs. J Vet Diagn Invest. 2014;26(3):404–411.
  3. Data on file at IDEXX Laboratories, Inc. Westbrook, Maine USA.
  4. Data on file at IDEXX Laboratories, Inc. Westbrook, Maine USA: Aggregate detection of hookworm, roundworm, and whipworm infections.
  5. Elsemore DA, Geng J, Cote J, Hanna R, Lucio-Forster A, Bowman DD. Enzyme-linked immunosorbent assays for coproantigen detection of Ancylostoma caninum and Toxocara canis in dogs and Toxocara cati in cats. J Vet Diagn Invest. 2017;29(5):645–653. doi:10.1177/1040638717706098
  6. Data on file at IDEXX Laboratories, Inc. Westbrook, Maine USA. Preliminary data on positive rate for Dipylidium caninum is approximately 6%.
  7. ESCCAP guidelines: GL4: Parasitological Diagnosis in Cats, Dogs and Equines. ESCCAP UK Website: Accessed Feb 20, 2023.