Standard TSH testing misses the most common causes of thyroid dysfunction. We test the complete thyroid picture — and treat to optimal, not just “in range.”
The Problem
You went to your doctor feeling exhausted, foggy, cold, and heavy. Your labs came back. TSH was “normal.” You were told there's nothing wrong with your thyroid.
But you still feel it. The fatigue that no amount of sleep fixes. The brain fog that makes you feel 20 years older than you are. The weight that won't move no matter what you do. The cold hands and feet. The depression that doesn't quite lift.
You're not imagining it. Standard thyroid testing is profoundly inadequate for identifying the most common forms of thyroid dysfunction — and millions of people are undertreated as a result.
Symptoms of Undertreated Thyroid
Why It Gets Missed
TSH (Thyroid Stimulating Hormone) is a pituitary hormone — it measures how hard your brain is pushing your thyroid, not how much thyroid hormone you actually have. A normal TSH can coexist with low Free T3, the active hormone your cells actually use. Checking only TSH is like checking your car's gas gauge without looking at the fuel injectors.
T4 (levothyroxine, Synthroid) is an inactive storage hormone. Your body must convert it into T3 to use it. Many patients — especially under stress, with inflammation, or nutrient deficiencies — convert T4 poorly, producing excess Reverse T3 instead. Standard testing doesn't check this conversion, so it gets missed entirely.
Hashimoto's thyroiditis — the most common cause of hypothyroidism — is an autoimmune attack on thyroid tissue. Early Hashimoto's can produce normal TSH and T4 levels while destroying thyroid function. It's only detectable through TPO and thyroglobulin antibody testing, which most standard panels don't include.
The SDV Difference
Our comprehensive thyroid panel includes every marker needed to find the true cause of your symptoms — not just the two markers standard labs check.
And we don't just treat to “within range” — we treat to optimal. There's a significant difference between a TSH of 4.5 (technically normal) and a TSH of 1.5 (optimal for most patients). Our goal is for you to feel your best, not just pass a lab value.
What We Test
When conversion is intact
For patients who convert T4 to T3 efficiently, levothyroxine is appropriate — but dosed to optimize Free T4 and T3 levels, not just TSH.
When conversion is impaired
Direct T3 supplementation bypasses the conversion step entirely. Often prescribed in combination with T4 for patients with high Reverse T3 or poor T4-to-T3 conversion.
For whole-hormone support
NDT (like Armour or NP Thyroid) contains both T4 and T3 in a natural ratio. Many patients who don't feel well on T4-only therapy respond dramatically to NDT.
The Bigger Picture
Every cell in your body has thyroid hormone receptors. Thyroid doesn't just control your temperature — it regulates how efficiently your cells burn energy, how your heart beats, how your brain functions, how your gut moves, and how well your sex hormones work.
This is why hormone therapy and weight loss medications often underperform for patients with unaddressed thyroid dysfunction. Testosterone requires adequate T3 to work properly. GLP-1 medications are less effective when thyroid is suppressing metabolism. HRT results are blunted when thyroid-related fatigue and brain fog aren't addressed first.
We almost always check thyroid as part of a complete workup — because fixing everything else while ignoring thyroid is like pushing a car with a flat tire.
Get My Thyroid Tested RightPatient Experiences
“I spent three years being told my thyroid was fine. My TSH was 3.2 — 'within range.' Meanwhile I couldn't get off the couch by noon. Within six weeks of starting T3, I felt like myself again for the first time in years.”
Maria T.
52, Scottsdale
“I'd been on Synthroid for four years and never felt right. Jason found I had terrible T3 conversion. Switching to a combination protocol changed everything — my brain fog lifted and the weight I couldn't move started coming off.”
Deborah K.
47, Phoenix
“I didn't even know thyroid was something men should worry about. I came in for testosterone issues, and Jason found my Free T3 was low despite normal TSH. Treating both together was completely different than treating one alone.”
Robert M.
58, Tucson
Common Questions
Yes — and this is one of the most common frustrations we hear. TSH is a pituitary hormone, not a thyroid hormone. A normal TSH means your pituitary is satisfied, but it says nothing about whether your thyroid is actually producing or converting enough T3 (the active hormone). We test Free T3, Free T4, Reverse T3, and thyroid antibodies — the markers that actually tell the full story.
T4 (thyroxine) is the storage form of thyroid hormone — mostly inactive. Your body must convert T4 into T3 (triiodothyronine), the active form that actually fuels your cells. Many people with normal T4 levels have poor T4-to-T3 conversion, meaning their cells are still functionally hypothyroid. Stress, inflammation, low iron, and certain medications all impair this conversion.
Hashimoto's is an autoimmune condition where the immune system attacks thyroid tissue. It's the most common cause of hypothyroidism and is frequently missed because standard TSH-only testing doesn't include thyroid antibodies. We test TPO and thyroglobulin antibodies to identify Hashimoto's — because the treatment approach is different when autoimmunity is involved.
We prescribe what your body actually needs — not just what's easiest. For patients who convert T4 to T3 well, levothyroxine (T4-only) may be appropriate. For patients with conversion issues, we may prescribe combination T4/T3 therapy (liothyronine), or natural desiccated thyroid (NDT) which contains both hormones in a natural ratio. Protocol depends entirely on your labs.
Absolutely. Low thyroid function — even subclinical hypothyroidism — reduces basal metabolic rate, impairs fat metabolism, causes water retention, and increases insulin resistance. Patients with undertreated thyroid dysfunction often find that weight loss is nearly impossible until thyroid function is optimized, even with perfect diet and exercise.
Thyroid and sex hormones are deeply interrelated. Low T3 reduces the effectiveness of estrogen and testosterone at the cellular level — meaning HRT and TRT can underperform until thyroid is addressed. We routinely find that patients who weren't getting full results from hormone therapy see dramatically better outcomes once thyroid is optimized alongside it.
No — we are a cash-pay practice. This allows us to order comprehensive panels and prescribe what you actually need, rather than what insurance approves. Many patients find that our lab costs are competitive with insurance co-pays, and treatment decisions are never limited by coverage requirements.
Book Your Consultation
Book your $147 consultation with Jason Steinberg, FNP-C, ENP-C. We review your health history and lab results in full, then build a personalized metabolic optimization plan around your goals — all via Zoom from anywhere in Arizona. Labs are ordered separately at $135–$150, or use your own insurance.
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