---
title: "Thyroid-Stimulating Hormone (Thyrotropin) Optimal Range vs Lab Normal (2026 Clinical Decoder & Protocol) | Nutrition Research Labs"
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description: "Decode your Thyroid-Stimulating Hormone (Thyrotropin) (TSH) blood test: Longevity Optimal Target (0.8–2.0 mIU/L) vs Standard Lab Normal (0.45–4.5 mIU/L), assay interference, and Grade-A clinical protocols."
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---

> **Canonical Source:** [https://nutritionresearchlabs.com/biomarkers/tsh-thyroid](https://nutritionresearchlabs.com/biomarkers/tsh-thyroid)
>
> *Decode your Thyroid-Stimulating Hormone (Thyrotropin) (TSH) blood test: Longevity Optimal Target (0.8–2.0 mIU/L) vs Standard Lab Normal (0.45–4.5 mIU/L), assay interference, and Grade-A clinical protocols.*

## Reference Range Comparison (mIU/L)

- **Longevity & Metabolic Optimal Range:** 0.8 – 2.0 mIU/L
- **Standard Lab Reference Interval ("Normal"):** 0.45 – 4.5 mIU/L
- **Why Standard Lab Ranges Mislead Patients:** The conventional reference range (0.45 to 4.5 mIU/L) was calculated from reference samples containing asymptomatic subclinical Hashimoto autoimmune thyroiditis. The National Academy of Clinical Biochemistry confirmed over 95% of healthy euthyroid adults have a TSH between 0.4 and 2.5 mIU/L.
- **Pre-Draw Supplement Assay Interference Warning:** CRITICAL: High-dose Biotin (Vitamin B7) found in hair/nail supplements directly interferes with streptavidin-biotin immunoassays, causing falsely suppressed TSH and falsely elevated Free T4/T3 (mimicking severe Graves thyrotoxicosis). Discontinue biotin 72 hours before testing.

## Decode the Next Biomarker on Your Blood Panel

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