Horse Ulcer Blood Test Fails

A blood test designed to detect gastric ulcer pain in horses has been found to be unreliable, with researchers concluding that it cannot distinguish between horses with and without gastric ulcers. The study, led by Australian veterinarians, highlights the need for better detection methods for Equine Gastric Ulcer Syndrome (EGUS).

The study collected blood from 77 horses and exposed immune cells from the blood to substances designed to trigger an immune response. The test measured production of a molecule called interleukin-1 beta (IL-1β), which has been linked to pain and inflammation in other species. However, only 25% of horses showed a measurable response in the blood-cell test.

Of the 64 horses included in the final analysis, 59 (92.2%) had gastric lesions. Despite this, there was no significant association between the response to the test and the presence of EGUS. The test could not reliably distinguish horses with or without gastric ulcers.

The researchers also found no significant difference in facial pain scores between horses that responded to the test and those that did not. This suggests that the test is not a reliable indicator of pain in horses with gastric ulcers.

## Why it matters Gastric ulcers affect a large proportion of horses, particularly racehorses. The inability to reliably detect pain in these animals makes it difficult for veterinarians to provide effective treatment. The study highlights the need for better detection methods for EGUS, which is essential for improving the welfare of horses.

The failure of the blood test to detect gastric ulcer pain in horses is a significant setback, but it also underscores the complexity of diagnosing pain in animals. Horses cannot communicate their pain in the same way that humans do, making it challenging for veterinarians to identify and treat the condition. Further research is needed to develop more effective detection methods for EGUS and improve the lives of affected horses.