OneDayTests Thyroid Stimulating Hormone (TSH) Blood Test
Type
Blood Testing
Biomarkers
3
Duration
30 min
Results
48 hours
Comprehensive thyroid function blood test using a blood sample to measure TSH levels and assess thyroid health.
This test measures Thyroid Stimulating Hormone (TSH), a hormone produced by the pituitary gland that regulates thyroid function. It helps diagnose hypothyroidism (underactive thyroid) or hyperthyroidism (overactive thyroid). The test is crucial for evaluating thyroid gland function and diagnosing thyroid disorders. Results help determine if the thyroid is producing enough hormones and can monitor thyroid hormone replacement therapy. It's beneficial for individuals with symptoms like fatigue, weight changes, or hair loss, or a family history of thyroid issues.
Key Details
Who Is This For?
Anyone experiencing unexplained fatigue, weight changes, hair loss, cold sensitivity, or mood disturbances. People with a family history of thyroid disease or autoimmune conditions. Women planning pregnancy, as thyroid function is critical for fetal brain development. Anyone who has had a 'normal' TSH result but still suspects thyroid dysfunction.
What's Included
Preparation Required
No fasting required for a standalone thyroid panel. If you take thyroid medication (levothyroxine/Synthroid), take your dose after the blood draw, not before — taking it beforehand can temporarily spike T4 levels and skew results. Morning testing is recommended for the most consistent TSH readings, as TSH follows a circadian rhythm and peaks overnight.
Biomarkers Tested
3The primary screening test for thyroid function. TSH is produced by the pituitary gland to regulate thyroid hormone production. High TSH indicates an underactive thyroid (hypothyroidism), while low TSH suggests an overactive thyroid (hyperthyroidism).
The unbound, active form of the main thyroid hormone T4. Free T4 directly reflects thyroid gland output and is used alongside TSH to diagnose and monitor thyroid disorders.
The active form of thyroid hormone responsible for regulating metabolism, energy, and body temperature. Free T3 is converted from T4 in tissues and is three to four times more potent than T4.
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- Category
- Diagnostic
- Sample Type
- Blood draw
- Duration
- 30 min
- Results
- 48 hours
OneDayTests
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