TSH (Thyroid Stimulating Hormone) Ultrasensitive, Serum

What is the TSH (Thyroid Stimulating Hormone) Ultrasensitive Test?

• Measures the level of TSH, a hormone produced by the pituitary gland that regulates thyroid function.
• Uses a highly sensitive assay to detect very low concentrations, useful for early detection of thyroid dysfunction.

Key Parameter

Why the Test is Done

• Routine screening during a health check‑up.
• Evaluation of symptoms such as fatigue, weight changes, cold intolerance, or hair loss.
• Monitoring of known thyroid disorders (hypothyroidism or hyperthyroidism).
• Assessment before starting thyroid medication or pregnancy.

Early Detection

The test can help identify signs of thyroid dysfunction, but it does not diagnose on its own. A doctor interprets the result together with symptoms, history, and other tests.

What Abnormal Results May Indicate

• High TSH: Often suggests an underactive thyroid (hypothyroidism) or pituitary issues.
• Low TSH: May indicate an overactive thyroid (hyperthyroidism) or excess thyroid hormone therapy.

Many factors—medications (e.g., amiodarone, steroids), recent illness, pregnancy, or lab variability—can affect TSH levels. Results should be interpreted in context.

Who Might Be Advised to Get This Test

• Adults with symptoms of thyroid disease.
• Individuals with a family history of thyroid disorders.
• Pregnant women or those planning pregnancy.
• Patients on medications that affect thyroid function.
• People undergoing routine health screening.

Summary: The TSH ultrasensitive test measures pituitary‑driven thyroid activity, helping clinicians spot thyroid problems early and guide treatment.

• Fasting: No fasting required.
• If combined with fasting tests: Follow the longest fasting period required by any test in the panel.
• Sample collection: A small needle puncture draws 5–10 mL of venous blood, usually from the arm. The procedure takes a few minutes.
• Discomfort: A brief needle prick; some people feel a slight sting.
• Precautions: No special medication timing or hydration instructions are needed for TSH alone. Avoid heavy alcohol or intense exercise 24 h before if you are also doing other tests that require it.
• Note: Confirm specific preparation with your doctor or the lab. This information is educational and not a substitute for professional medical advice.