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    There are antibody tests that can help get a differential diagnosis. TSI – Thyroid Stimulating Immunoglobulin is one, and there are about three others. TSI is the main one. Subclinical hnyperthyroidism is sometimes hard to diagnose with just a TSH. In his book, Overcoming Thyroid Problems by Jeffrey Garber, MD, he mentions specifically that children may grow faster than is usual, and appear tall for their age. The other symptoms he mentions are behavioral changes, inability to sleep, and short attention spans.