What is the reference range for Thyroid-Stimulating Hormone?

The standard reference range for Thyroid-Stimulating Hormone is Approximately 0.4–4.0 mIU/L, assay-specific.. Reference ranges vary by laboratory and assay platform — interpret in context of the issuing laboratory's stated range.

Which tests measure Thyroid-Stimulating Hormone?

Thyroid-Stimulating Hormone is measured in 1 test on BiomarkersLabs.com, including ADHD Ultimate Panel.

Biomarker Reference · TSH

What does the Thyroid-Stimulating Hormone test measure?

Q: Why is Thyroid-Stimulating Hormone measured?

Both overt and subclinical thyroid dysfunction can present with inattention, cognitive slowing, or behavioural changes that overlap with or exacerbate ADHD symptoms. TSH screening is standard in the evaluation of attention and behavioural concerns to exclude a thyroid contribution.

Thyroid-Stimulating Hormone (TSH) is a clinical biomarker used in comprehensive-panels assessment. TSH is secreted by the anterior pituitary in response to hypothalamic TRH and regulates thyroid hormone synthesis and release. It is measured in 1 laboratory test on BiomarkersLabs.com.

Reference Range: Approximately 0.4–4.0 mIU/L, assay-specific.
Units: mIU/L, µIU/mL
Measured In: 1 test
Category: —

Functional medicine optimalSome functional sources prefer TSH <2.5 mIU/L, though this target is not universally endorsed and should be interpreted with free T4 and clinical context.

What is Thyroid-Stimulating Hormone?

TSH is secreted by the anterior pituitary in response to hypothalamic TRH and regulates thyroid hormone synthesis and release. It is the most sensitive first-line marker of thyroid dysfunction, rising in primary hypothyroidism and falling in hyperthyroidism. Thyroid hormones are critical for neurodevelopment, myelination, and regulation of metabolism and arousal.

Why is Thyroid-Stimulating Hormone measured?

Both overt and subclinical thyroid dysfunction can present with inattention, cognitive slowing, or behavioural changes that overlap with or exacerbate ADHD symptoms. TSH screening is standard in the evaluation of attention and behavioural concerns to exclude a thyroid contribution.

Reference ranges

Standard reference: Approximately 0.4–4.0 mIU/L, assay-specific.
Functional medicine optimal: Some functional sources prefer TSH <2.5 mIU/L, though this target is not universally endorsed and should be interpreted with free T4 and clinical context.
Units: mIU/L, µIU/mL

Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.

Tests that measure Thyroid-Stimulating Hormone

1 test on BiomarkersLabs.com include this biomarker.

BML-CHP-021Comprehensive

ADHD Ultimate Panel

Thyroid-Stimulating Hormone reference range in this test: Approximately 0.4–4.0 mIU/L, assay-specific.

Related clinical conditions

Related Biomarkers

Frequently measured alongside

Serum ZincZn1 test Serum MagnesiumMg1 test Serum CopperCu1 test Serum FerritinFerritin1 test 25-Hydroxyvitamin D25(OH)D2 tests Omega-3 IndexO3I1 test HomocysteineHcy5 tests High-Sensitivity C-Reactive Proteinhs-CRP1 test

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