Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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All the best,
Dr. Getty
Good Morning, Dana,
Since we don't know if your horse has cushings, it would be a good idea to stay away from high sugar treats such as carrots and apples. I would recommend simply giving him broken up alfalafa cubes as a treat.
His hypoglycemia could be a snapshot of his blood glucose level at that particular time and it does not mean that you need to give him more sugar. If consistently low, it indicates that he is starting to develop insulin resistance and his body is pumping out more of this hormone, leading to low blood sugar.
So, when you have a chance to visit with your vet, see if you can get his take on the bloodwork since he knows what time of day he took it, your horse's status at the time, etc.
But, if he does have Metabolic Syndrome (insulin resistance) or even Cushings, you'll want to eliminated starchy and sugary foods from his diet. This means no cereal grains such as oats, corn, barley, no molasses-sweetened feeds, and no carrots or apples.
Please let me know if I can assist you further.
Dr. Getty 
Where are you from? Bayfield, CO