Hi. I am really hoping that someone may be able to help guide me in the right direction, I am currently waiting to hear back from his doctor, but when it comes to my son's health, I am just very impatient and I am concerned that it could be an issue with his pituitary gland.
My son is 12 years old, he had low T4 levels when he was 5, 2 separate tests, then the 3rd was normal. Recently, he has been getting very frequent headaches and he has had quite a bit of weight gain over the past 6 months, no matter what he eats, he keeps gaining weight. His primary doctor tested his thyroid again.
7/11/16
Free T4 Assay 0.7 ng/dL (Low) Normal range: 0.9 - 1.4 ng/dL
TSH 3.49 mIU/L Normal range 0.50 - 4.30 mIU/L
7/15/16
Free T4 Assay 0.8 ng/dL (Low) Normal range 0.9 - 1.4 ng/dL
TSH 4.55 mIU/L (High) Normal range 0.50 - 4.30 mIU/L
They also ran a CBC, everything there was normal.
He was referred to an endocrinologist, more tests were done:
Bone age study indicates that he most closely corresponds to the bone age of a 13 year old
Free T4 Assay Dialysis Method 0.8 ng/dL (Low) Normal range 1.0 - 2.4 ng/dL
Thyroglobulin Antibody <1 IU/mL Normal range: < or = 1 IU/mL
Antithyroid Peroxidase AB <1 IU/mL Normal range: <9 IU/mL
CBC all normal
TSH 2.35 mIU/L Normal range: 0.50 - 4.30 mIU/L
Free T4 Assay 0.8 ng/dL (Low) 0.9 - 1.4 ng/dL
C-Reative Protein 0.10 mg/dL Normal range: <0.80 mg/dL
Somatomedin
IFG1 167 ng/mL Normal range: 146 - 541 ng/mL
Z Score -1.5 SD Normal range:-2.0 - +2.0 SD
So as you can see the only thing that is abnormal is his thyroid levels and my concern is because from my understanding, when he has a low T4, his TSH should be elevated, but it is not and from my understanding, this can be more of an indicator of a pituitary issue, but hisT4 levels are not that low, so should I be concerned? Could this still mean a pituitary issue?
Thank you for your time,
Melissa