TSH

TSH is secreted by the anterior pituitary in response to feedback from circulating thyroid hormones (T3, T4). Even small changes in thyroid output produce amplified, opposite-direction TSH changes — making it the most sensitive screening marker for primary thyroid dysfunction.

Thyroid hormone regulates basal metabolic rate, cardiovascular function, mood, energy, and lipid metabolism. Both overt and subclinical thyroid dysfunction associate with cardiovascular risk, cognitive symptoms, and altered body composition.

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• Randox Health

  UK · EU · INTL

  Clinic-based premium panels — wider biomarker breadth than home-test brands.

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• Synlab

  DE · EU · INTL

  Europe-wide medical lab network — referrals via partner GPs and direct-to-consumer programmes where offered.

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• Cerascreen

  DE · EU

  Established German home-test catalogue — ISO-certified labs, German-language reports.

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• Medichecks

  UK

  UKAS-accredited home blood-test panels with GP-equivalent biomarker coverage.

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Lab reference ranges vary; modern data argues that population-distribution-based upper limits (~4.0–4.5 mU/L) include many people with autoimmune thyroid disease. Some endocrinologists treat above 2.5 in symptomatic patients; the evidence is mixed.

Acute illness, recent surgery, steroid therapy, and dopaminergic medications all suppress TSH transiently. A single abnormal TSH should be repeated 4–8 weeks later before action.

• If borderline, whether to add free T4 and thyroid antibodies (anti-TPO).
• If subclinical hypothyroidism (TSH 4–10, normal T4), whether treatment is warranted given your symptoms and risk factors.
• If pregnancy is planned, whether your TSH should be lower than the standard reference range.

1. [1]Garber et al., AACE/ATA — Clinical practice guidelines for hypothyroidism in adults(2014)
2. [2]Alexander et al., ATA — Guidelines for the diagnosis and management of thyroid disease during pregnancy(2017)
3. [3]USPSTF 2015 — Screening for thyroid dysfunction(2015)