Yes this is the only way to find out for sure. Ask the receptionist for a copy of your results when they come back from the lab. Put the results onto this forum. This is the advice I got from the helpful people on here. Have your blood tested as early as possible and don't eat any breakfast until after. The Doctors will tell you that you don't need to fast but it does make some difference to the results.
I keep copies of every test that I have now. It is a good way to see for yourself how your health is doing and for referring back to when needed. I was ignorant of all these things for too many years but this forum as been a life saver.
A lot of us have suffered because the Doctor has told us our TSH is within the normal range. This is not a true picture and we need all the other test done. Along with Vit D and B12, Folate and Ferritin. Take control of this situation with your Doctor and tell them politely that you want these test.
Keep in touch and post your results when you get them. Someone will help to interpret them on here.
Best Wishes x