Thyroid health is one of the most common concerns we hear about in our office.
Many people with thyroid issues don’t feel their best on standard medications and often aren’t offered other options to optimize their thyroid and feel better. They’re told their labs look “fine” and their treatment is “good enough.” But if you’re still not feeling great, there’s more we can do. It starts with learning how to accurately test your thyroid levels.
Taking an integrative approach to thyroid health means going beyond the basics. It involves detailed lab testing and a more holistic approach to treatment.
This could include exploring different medication options, focusing on key nutrients that support the thyroid, and looking at how diet and lifestyle play a role. Lab testing, in particular, is crucial because it provides the information needed to support your thyroid effectively. Understanding what can influence these lab results is key to getting accurate tests, proper interpretations, and the best treatment plan for you.
So, what affects thyroid testing?
There are several factors that can impact your thyroid lab results.
Here are some important things to keep in mind before you test your thyroid levels:
Timing Your Medication
It’s best to have your blood test done in the morning *before* taking your thyroid medication. Taking it beforehand can temporarily raise hormone levels in your blood and skew the results.
Time of Day
Thyroid levels follow a natural daily rhythm, so testing in the morning is ideal to get the most accurate snapshot of your thyroid health.
Biotin Supplements
Biotin (Vitamin B7), a common supplement, can interfere with lab results by making thyroid hormone levels appear falsely high or low. If you take high doses of biotin, stop taking it 48 hours before your test.
Fasting
You don’t need to fast for thyroid testing, but consistency is key. If you’ve fasted for thyroid tests in the past, keep fasting for future ones to ensure your results can be compared accurately over time. If you’re having other labs done that *do* require fasting, it’s a good idea to fast for your thyroid test too, to keep things consistent.
Sleep
Poor sleep the night before your test can temporarily throw off thyroid levels. Aim to get a good night’s sleep so your results reflect your body’s usual state.
Stress
Stress impacts all kinds of hormones, including thyroid hormones. If you’re going through something major, like moving or dealing with a big life change, it’s best to wait until things settle down and your body is back to baseline before running thyroid tests.
Illness
Avoid testing your thyroid levels when you’re sick. Illnesses like colds or infections can temporarily affect thyroid hormones. Wait until you’re back to feeling 100% before doing your labs.
The Bottom Line
The best way to test your thyroid is to keep things simple: do your labs in the morning, before taking your meds, and on a typical day (not during illness or major stress). Consistency is key—try to stick to the same routine for each test to get the most accurate results over time.
Taking the time to prepare properly for thyroid testing can make a big difference in understanding your health and finding the right treatment plan for you.
If you have questions or need support, we’re here to help!
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Dr. Caitlan Gignac. ND
Naturopathic Doctor San Jose
408-356-1364
