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Objectives  Published descriptions of the oral sugar test ( OST ) and insulin response test ( IRT ) have been inconsistent when specifying the protocol for fasting horses before testing. The purpose of our study was to examine the effect of fasting duration on blood glucose concentration, blood insulin concentration, glucose/insulin ratio,  OST , and  IRT  results in horses.    Animals  Ten healthy adult horses.    Procedures  Both  OST  and  IRT  were performed on horses without fasting and after fasting for 3, 6, and 12 hours. Thus, 8 tests were performed per horse in a randomized order. Blood collected at the initial time point of the  OST  was analysed for both blood glucose and serum insulin concentrations so that baseline concentrations and the glucose/insulin ratio could be determined. Unless fasted, horses had free‐choice access to grass hay.    Results  There was no effect of fasting and fasting duration on blood glucose concentration, serum insulin concentration, glucose/insulin ratio, or the  OST . Response to insulin in the  IRT  was decreased in fasted horses. The effect increased with fasting duration, with the least response to insulin administration after a 12‐hour fast.    Conclusions and Clinical Relevance  These data indicate that insulin sensitivity is not a fixed trait in horses. Fasting a horse is not recommended for a glucose/insulin ratio or  IRT , and fasting a horse for 3 hours is recommended for the  OST .

journal of veterinary internal medicine

The Effect of Fasting Duration on Baseline Blood Glucose Concentration, Blood Insulin Concentration, Glucose/Insulin Ratio, Oral Sugar Test, and Insulin Response Test Results in Horses