What are the best tests for thyroid function?
The thyroid plays a huge role in your overall health. Most people have no idea what test to take or what those tests mean when it comes to thyroid testing. That’s unfortunate because believe it or not, some doctors may not understand thyroid testing either or how to interpret it. This happens all the time. So what are the best tests for thyroid function? Let’s explore that question by reading the example below.
Lisa is having difficulty maintaining her energy throughout the day. She attributes it to poor sleep and more stress with her work, but she is also experiencing changes in her hair, increased anxiety, and weight gain. She sets up an appointment with her family practitioner, who checks some basic lab work, including iron levels, electrolytes, and a TSH. All come back normal (or within normal lab limits according to the laboratory reference ranges). Her practitioner advises her to eat less, exercise more, and lower stress. But none of this works, and she continues to have symptoms for years, before a friend mentions that Jane probably needs a more comprehensive evaluation. With the right testing, she is finally able to get the right treatment and improve her life. But she didn’t need to suffer for so long!
Unfortunately, all too often this scenario occurs in mainstream medicine. Often, the labs that are ordered are dictated by medical algorithms, which then determine insurance coverage of a lab. Patients know something is not right, and the practitioner often feels helpless by the inability to “cure” the patient’s symptoms.
There are over 300 symptoms that correlate with thyroid dysfunction. A low-output thyroid (aka hypothyroidism) is the most common condition, but 5% of thyroid problems can come from an over-active thyroid (aka hyperthyroidism). If you suspect you may have a thyroid condition, or know someone who does, it all starts with the right tests – tests that look at thyroid FUNCTION:
TSH (Thyroid Stimulating Hormone): This hormone comes from an area of the brain known as the pituitary. It is not created by the thyroid (which is found at the base of the throat), but it does affect the hormones produced by the thyroid. Think of this as the “SOS” signal – there will be more signals if not enough thyroid hormones are being produced, and there will be no/few signals if there are enough thyroid hormones circulating in the body. The problem with this is that it mostly responds to levels of T4 (which aren’t the active thyroid hormones)
Free T4: The main hormone produced by the thyroid gland. This hormone has to be converted into free T3 to activate (i.e. exert effects on the body, such as regulate metabolism and energy).
Free T3: Some of this produced by the thyroid, but the majority of this comes from the conversion of free T4 into free T3. This conversion happens all over the body but is particularly active in the liver and in the gut (which is why gut health and liver function is so important to maintaining optimal thyroid hormone levels!).
Thyroid peroxidase antibodies (TPO antibodies), aka the “soldiers” that mistakenly see parts of the thyroid gland as “foreign invaders”. These are created by the immune system and can be detected in blood tests 10 or more years before other changes are seen in other blood tests. This is associated with a poor functioning thyroid but can also be associated with a hyperactive thyroid gland.
If the example in this article describes you, it may be time to explore other options such as having your own independent thyroid testing done. Don’t let a medical professional stand in the way of getting answers and solutions to your health. Make a good choice for getting the best thyroid testing. Even if you have had your TSH checked, if this is over 2 and you have symptoms of hypothyroidism, you owe it to yourself to dig a little deeper and get a complete thyroid evaluation!
If you’re feeling a bit off or you think something may be wrong with your thyroid, then do yourself a favor and make sure you get the best tests for thyroid function so that you are getting the information you need to get well.