Remember Seasonal Variation in Cushing's Testing

From thehorse.com:
Remember Seasonal Variation in Cushing's Testing

"Key findings in this study were:
-- There is a seasonal variation in both ACTH and alpha-MSH blood levels that is more evident in ponies than horses.
-- These variations should be taken into account when testing or monitoring horses or ponies for PPID;
-- Reference ranges for ACTH and alpha-MSH probably should be adjusted for season;
-- Normal ranges of ACTH, alpha-MSH, and insulin appear slightly different for horses and ponies and these differences should be considered when interpreting laboratory test results."

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