diabetes in children

My son complained of feeling weired when he went out to play basketball in the yard.  He ate a bowl of high fiber oatmeal about 45 minutes before he went out to play.  He came back in within 5 minutes and said he felt shacky.  I gave him a bottle of water and took him to the doctor.  He glucose reading was 144.  She wants to test him for diabetes.  If his glucose was 144 why would he feel shacky.  I thought you only did the shacking when your glucose is low.  Do you think he is diabetic?

[venustiana]

If your sugar is high and you go out to play, you are going to feel tired quickly and shaky. That happens to me often. Sometimes just taking a shower makes me extremely tired and shaky if I'm high.