I think it is a very good idea to consult with a specialist. I also think repeat the test before taking a pill. In case there was a lab mistake. Repeat it right away, don’t wait a long time. If she needs the meds she must take them. The difference in how she feels will probably be significant and you might have avoided some depression, fatigue, and other health problems by catching this now. Has she been symptomatic? Dry eyes, dry hair, hair falling out, sleeping for more than ten hours, fatigued, slow heart rate, high blood pressure, low appetite, low enthusiasm to do things. People can easily mistake some of the symptoms for typical teenage behavior.
You can try to increase her iodine to treat it naturally. I don’t personally know anyone in America that this has worked for. Don’t try it a long time, her thyroid could be getting much worse fast. Either the natural methods you might want to try are working or not. Try it, test again within a month, if her numbers continue to get bad take the meds. If her TSH is already higher than 20, I would take the meds now (after the repeat test).
What you need to know is getting to the right dose can be difficult. When she starts taking medication if they overdose her she will become hyperthyroid induced by medication. Those symptoms are also dry eyes, dry hair, hair falling out, but the difference is, edgy, unable to sleep well, fast heart rate, low blood pressure, spacy, ravenous. Not everyone gets all symptoms when they are hypo or hyper.
I personally think when someone starts meds they should be tested in a month, and then again in a month, but usually most doctors make you wait 6–8 weeks. Go in as early as he will allow for the first follow up blood test, and be vigilant to test every 6–8 weeks for the first 6 months.
Everything your daughter complains about take seriously as possibly her thyroid being outside of normal limits.
Get familiar with her blood test numbers and tell her you want to know when she is feeling really good, so you can look at her tests at that time and now what her ideal numbers are. Normal is a range, but her normal is probably very narrow for feeling well. She may not realize how crappy she has been feeling until she begins to feel better on the medication.
TSH is inverse. High TSH means low thyroid. Anything above a 4 most endocrinologists will consider high, even though the normal range goes to 5 usually, sometimes a little more. The other measures, T4 and T3, are low when the thyroid is slow. Many endocrinologists think a TSH between 1 and 2 is a good target, but for me anything below 2 is horrible. I am extremely symptomatic. My best is around 2.5–3. If I relied on the doctors only for interpreting my tests I would never feel good and be a cardiac patient for racing heart, and a psych patient for inability to sleep wel, anxiety, and anger issues. Plus, I would be nearly bald on the top of my head.
If they give her synthroid and she has trouble stabilizing consider adding T3. Synthroid is just T4. I add a small dose of Armour thyroid, some people add the synthetic T3 Cytomel. I know this is a lot of information, but you will store it in the back of your mind for future use. Some doctors don’t believe in adding T3.
Thyroid medication must be taken on an empty stomach and you cannot take iron within four hours of the meds. This is extremely important. The med must be taken with water and she cannot eat for at least 30 minutes afterwards. If she has eaten she has to wait over two hours to take the medication to make sure her stomach is empty.