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The Fatigue Root Cause Checklist

7 Tests Your Doctor Should Be Running (But Probably Isn't)
By Tricia — LPN, Certified Naturopath

If you've been told your labs are "normal" but you're still exhausted, the problem isn't that nothing is wrong — it's that the wrong tests are being ordered. Conventional panels miss the functional markers that drive chronic fatigue in women 35–55. Use this checklist at your next appointment or share it with your provider.

Tests you've already run

0 of 7 panels checked

Complete Thyroid Panel

TSH (Thyroid Stimulating Hormone) Standard thyroid screen — ordered by most GPs, but alone it misses subclinical dysfunction.
Free T3 + Free T4 Active thyroid hormones. T3 is what your cells actually use. Low-normal T4 with poor T3 conversion = fatigue even with "normal" TSH.
Often missed
Thyroid Antibodies (TPO + Anti-TG) Identifies Hashimoto's autoimmune thyroiditis, which can cause fatigue years before TSH becomes abnormal.
Critical for women 35+
Reverse T3 (rT3) High rT3 blocks T3 receptors, causing fatigue despite normal thyroid hormone levels. Triggered by chronic stress and nutrient depletion.

Cortisol & Adrenal Function

4-Point Salivary Cortisol (AM, Noon, PM, Night) Blood cortisol gives a single snapshot. 4-point salivary testing maps your daily rhythm — flattened cortisol patterns drive morning fatigue and afternoon crashes.
Often missed
DHEA-S Precursor to estrogen and testosterone. Declines with chronic stress. Low DHEA-S is strongly correlated with fatigue, low motivation, and poor recovery.

Iron & Ferritin Panel

Serum Ferritin (with optimal range 70–100 ng/mL) Standard "normal" ferritin can be as low as 12 ng/mL. Functional fatigue begins below 30. Many women need ferritin >70 to feel energized. Ask for the number, not just "normal/abnormal."
Critical — get the number
Serum Iron + TIBC (Total Iron Binding Capacity) Full iron panel catches functional iron deficiency that ferritin alone can miss.

Vitamin D & B12

25-OH Vitamin D (optimal 60–80 ng/mL) Vitamin D receptors are on every cell. Deficiency disrupts energy metabolism, immune function, and mood. The standard "sufficient" cutoff of 30 ng/mL is below optimal for energy.
70% of women are deficient
Vitamin B12 + Methylmalonic Acid (MMA) MMA confirms cellular B12 deficiency even when serum B12 looks normal. B12 deficiency causes fatigue, brain fog, and nerve issues.

Gut Health & Permeability Markers

Comprehensive Stool Analysis (GI-MAP or equivalent) Screens for pathogenic bacteria, parasites, yeast overgrowth, and beneficial bacteria ratios. Gut dysbiosis is a major driver of systemic fatigue through LPS-driven inflammation.
Often missed
Zonulin (Intestinal Permeability / "Leaky Gut") Elevated zonulin indicates intestinal permeability — where undigested food particles enter the bloodstream and trigger chronic systemic inflammation and fatigue.

Inflammatory Markers

High-Sensitivity CRP (hs-CRP) Sensitive marker of systemic inflammation. Standard CRP catches acute infection; hs-CRP detects the chronic low-grade inflammation that fuels fatigue. Target <1.0 mg/L for optimal energy.
Homocysteine Elevated homocysteine signals methylation dysfunction, B-vitamin deficiency, and increased cardiovascular + neurological inflammation. Strongly associated with fatigue and brain fog.
Often missed

Comprehensive Hormone Panel

Estradiol, Progesterone, Testosterone (Free + Total) Declining estrogen in perimenopause disrupts mitochondrial energy production. Low progesterone causes poor sleep and anxiety. Low testosterone causes muscle weakness and fatigue in women.
Critical for women 35–55
Fasting Insulin + Glucose (HOMA-IR for insulin resistance) Insulin resistance causes cellular energy starvation despite normal blood sugar. It's the "tiredness right after eating" pattern. Standard glucose tests miss it — request HOMA-IR calculation.
Often missed

Ready to Address the Root Causes?

Knowing what tests to run is the first step. Interpreting the results and building a protocol that actually corrects the underlying dysfunction — that's where the transformation happens.

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