Hormone Health Hub: Expert Insights on Testing, Balance & Better Living — free T4 testing

Many patients produce sufficient thyroid hormone yet still suffer from classic hypothyroid symptoms. Why? Because standard TSH testing misses the full picture. In this clinical guide, Jim Paoletti explains the functional approach to thyroid assessment — examining T4 production, TBG binding, T4-to-T3 conversion, cortisol interference, ferritin and vitamin D — and outlines exactly which tests are needed for a complete analysis.

At 24, Dr. Kate Placzek was sleeping 16 hours a day and barely functioning — yet her standard blood tests came back normal. It took a TSH result in the mid-thirties to finally explain her debilitating fatigue. In this candid personal account, she shares her thyroid diagnosis, what she learned about optimal TSH levels, and why testing beyond TSH alone can make all the difference.

If you are experiencing infertility issues, understanding which hormones to test — and why — is the essential first step. Dr. Alison McAllister of ZRT Laboratory explains the full fertility hormone profile: from LH and FSH as indicators of ovarian reserve, to estradiol, progesterone and testosterone for ovulation health, adrenal hormones cortisol and DHEA-S, thyroid markers including TPO antibodies, and the often-overlooked role of vitamin D in fertility and PCOS.

Normal thyroid blood tests don’t always explain why patients still suffer from fatigue, cold intolerance, brain fog and weight gain. In this in-depth clinical article, ZRT Laboratory explains the critical role of selenium in thyroid hormone synthesis and T4-to-T3 conversion, how heavy metals like mercury and arsenic sequester selenium and inactivate protective antioxidant enzymes, and why this can trigger Hashimoto’s thyroiditis — even when TSH, T4 and T3 appear normal.

The thyroid gland is under constant threat from modern life — oestrogen dominance, chronic stress, iodine and selenium deficiency, heavy metal toxicity and xenoestrogen exposure all suppress its function. This article outlines 7 key action steps you can take to protect your thyroid, from hormone rebalancing and stress reduction to targeted nutritional support and testing.