Serum insulin concentration in horses: Effect of storage and handling.

This research examines how the storage and handling conditions may affect serum insulin concentration in horses, specifically whether the results differ if stored at room temperature as serum or as whole blood for 72 hours. The study indicates that these storage conditions don’t significantly impact the insulin measurement, thereby aiding the accuracy of horse endocrinopathic disease studies.

Objective of the Research

• The primary objective of this research was to investigate the effects of storage and handling on the concentration of serum insulin in horses. Given that instant analysis of these samples isn’t always possible, it is crucial to understand how different storage methods may impact the integrity of measurements.

Methods Employed in the Study

• The investigators used samples from 14 horses in this study. These samples were stored at room temperature for the duration of 72 hours, both as serum and as whole blood. This was in contrast to the practice of immediate separation and freezing.
• To measure the correlation and bias in the results obtained after storage, statistical tools such as Bland-Altman plots were used.

Key Findings of the Research

• The researchers found a high correlation in all comparisons, indicating that the measurements were consistent regardless of the storage methods.
• The study showed a minor negative bias in the samples stored as whole blood compared to serum. However, the mean difference of 2.16 µIU/mL was not considered clinically significant.
• A crucial finding of the research was that the storage method had no impact on the diagnostic results at two commonly used cut-offs.

Implications of the Research

• This research implies that serum insulin samples stored at room temperature for 72 hours, either as serum or whole blood, have minimal effects on the measured concentration in horses.
• This understanding can assist veterinary professionals in making informed decisions regarding the storage and handling conditions of insulin samples while diagnosing endocrinopathic diseases in horses. It can help reduce the dependency on immediate sample analysis, providing a flexibility in the timelines of such studies.