February 03, 2026

85. Over 45? You Need Your Doctor to Test Free T3

27 minutes

If your thyroid labs keep coming back "normal" but you're exhausted, can't lose weight, losing hair, and freezing all the time... if your doctor only checks TSH and tells you everything's fine... if you're terrified to start thyroid medication because "you'll be on it forever"... this episode is your wake-up call.

Dr. Terri breaks down the thyroid testing crisis that's leaving 50% of her patients with lingering symptoms despite "normal" labs. This isn't your typical thyroid talk - it's the truth about why TSH-only testing is failing millions of people, why Free T3 is the hormone that actually matters, and what's really going on when your body can't convert T4 to T3.

After almost two decades in practice, Dr. Terri finally cracked the code on why so many patients - especially women over 45-50 - optimize their hormones but still feel terrible. The answer? Their thyroid labs showed "normal" but their Free T3 levels were in the gutter.

WHAT YOU'LL DISCOVER:

→ Why TSH is only a screening tool (and tells you nothing about what's happening in your cells)

→ The test 99% of doctors don't run: Free T3 - the ACTIVE thyroid hormone

→ Why you can have perfect TSH and T4 but still be fully symptomatic for low thyroid

→ The T4 to T3 conversion problem: why your body isn't making active thyroid hormone

→ What destroys your deiodinase enzymes (stress, restrictive dieting, gut issues, medications)

→ The "normal range" scam: why optimal levels are completely different from lab ranges

→ Why a 10-month-old baby has Free T3 over 10 (but your doctor says 2.5 is "normal")

→ The medication myth debunked: "If I start thyroid meds, I'll be on them forever" (NOT TRUE)

→ How thyroid medication actually works (it's a feedback loop, not permanent suppression)

→ Phase 2 liver detox: the missing piece in thyroid optimization

→ Why fixing stress, diet, and gut health can improve thyroid function naturally

THE 3 TESTS YOU ACTUALLY NEED:

1. TSH - Screening tool only (tells you if thyroid gland is working)

2. Free T4*- The pro-hormone (80% of what thyroid secretes)

3. Free T3 - The ACTIVE hormone (what actually works in your cells)

Without all three, you're missing the picture.

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⏱️ TIMESTAMPS:

0:00 - Intro: Thyroid Awareness Month

1:45 - The lingering symptoms I couldn't explain in 50% of patients

3:30 - What I learned at a functional medicine conference that changed everything

5:20 - How medical school taught thyroid testing (and why it's incomplete)

7:15 - Understanding TSH: what it actually measures

9:40 - The T4 and T3 relationship (and why T3 is the active hormone)

11:30 - Why TSH doesn't detect low T3 problems

13:20 - Symptoms of suboptimal thyroid (cold hands, dry skin, hair loss, fatigue, depression)

15:45 - Why women struggle more with thyroid issues

17:30 - The deiodinase enzyme problem (T4 to T3 conversion)

19:10 - What destroys your conversion: stress, dieting, gut issues, medications

21:50 - Phase 2 liver detox and thyroid optimization

24:00 - Managing stress and diet to improve thyroid function

26:15 - The medication myth: "You'll be on it forever" - DEBUNKED

28:20 - How thyroid medication feedback loops actually work

30:00 - Why this is the #1 thing that gets missed in thyroid care

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📚 RESOURCES MENTIONED:

• Dr. Terri's Book: **Hormone Havoc**

Deep dive on thyroid in dedicated chapter

• EVEXIAS Health Solutions (Episode Sponsor)

Website: https://www.evexias.com

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⚠️ DISCLAIMER:

This content is for educational and informational purposes only and is not intended as medical advice. Always consult with a qualified healthcare provider regarding any thyroid or health concerns.

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By Dr. Terri DeNeui, DNP

2929 ratings