Updated Optimal Thyroid Lab tests & Reference Ranges

Why normal lab ranges might not mean optimal health (and what you can do about it)! Here’s something fascinating about lab reference ranges: They’re based on population averages, not optimal health markers. This means you can be “within range” but far from your best. Consider these examples: • Vitamin D at 32 ng/mL is technically normal, but research suggests 60 for optimal immune function • Ferritin at 15 is in range, yet many feel best above 50 • TSH at 4.5 passes standard screening, though ma

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