For about the past year my son has had a number of health issues. He's 17 years old, about 230 pounds, depressed, exhausted immediately when he wakes up, has general aches all over his body, and has also been suffering from migraines for about 5 years.
Things have taken a turn for the worse on all fronts the past 2 months, so we wanted to have some blood work done. His PED ordered some bloodwork, standard CBC, CMP, and also a thyroid profile including T4, TSH, Free T4, and Anti-TPO. Everything came back "normal" except for his T4. I'll post the Thyroid levels below, and can offer more results if helpful on other tests.
T4 (Thyroxine) = 5.50 [Reference 6.09-12.23]
TSH = 1.352 [Reference 0.340-5.600]
Free T4 = 0.63 [Reference 0.28-1.64]
Anti-TPO = <.25^2 Reference 0.00-8.90]
Basically my questions are this: Do those references take into account his age/weight, or are they adult standards? His regular T4 being low means what? Are there additional thyroid tests (or others in general) to seek an answer for his issues?
His doctor's response was everything was normal, so we're at an impass now. It's horrible seeing my son feel like this, and we really need answers.