Foal and Adult Horse Blood Samples: What’s the Difference?

Veterinarians should be familiar with what’s normal and what’s not normal on a foal’s blood sample test results.
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Blood and serum testing can provide a wealth of information about a horse’s current health status. Is he battling an infection or an immune-mediated disease? Does he have metabolic issues? Liver or kidney damage?

These red blood cell, white blood cell, platelet, and other levels become less clear, however, when dealing with a neonatal foal, whose body is still adapting to life outside the uterus. Therefore, it’s important that veterinarians become familiar with what’s normal and what’s not normal on a foal’s blood sample test results.

“Most labs only report reference ranges for adult horses, which can lead to foal samples being incorrectly flagged as abnormal,” said Michelle Barton, DVM, PhD, Dipl. ACVIM, director of clinical academic affairs and the Fuller E. Callaway endowed professor of large animal medicine at the University of Georgia College of Veterinary Medicine’s Department of Large Animal Medicine.

She described these differences between foals and adult horses at the 2015 American Association of Equine Practitioner’s Convention, held Dec. 5-9 in Las Vegas, covering everything from red and white blood cells to kidney and liver values

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Alexandra Beckstett, a native of Houston, Texas, is a lifelong horse owner who has shown successfully on the national hunter/jumper circuit and dabbled in hunter breeding. After graduating from Duke University, she joined Blood-Horse Publications as assistant editor of its book division, Eclipse Press, before joining The Horse. She was the managing editor of The Horse for nearly 14 years and is now editorial director of EquiManagement and My New Horse, sister publications of The Horse.

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