My 11 Year Old Daughter Had To Have Bloodwork Repeated

My 11 year old daughter had to have bloodwork repeated as her TSI was elevated. The new lab results show her T4, T3 and Free Thyroxine all within range.
The Thyroid Peroxidase is a <6 and her Thyroglobulin Antibody was 9.9, flagged as high. Her doctor could not tell me why, if this was normal or what could be the cause. Can you help me? She did recommend I take her to an Endicronologist. Thank you, Debora