The thyroid controls your metabolism, energy, and mood. An underactive thyroid (hypothyroidism) causes weight gain, fatigue, and constipation. An overactive thyroid (hyperthyroidism) causes weight loss, palpitations, and anxiety. A TSH blood test at Mascot Healthcare diagnoses both. Same day.
These are the symptoms and situations that indicate this test is the right next step.
Weight gain despite no dietary change — the classic hypothyroidism presentation. Low thyroid hormone slows metabolism.
TSH test essentialWeight loss without trying, with increased appetite — classic hyperthyroidism. Also causes heat intolerance and sweating.
TSH testAlways tired, always cold, needing more sleep — hypothyroidism is one of the most common and most missed diagnoses in Lagos women.
TSH + free T4Fast heart rate, tremor, and feeling wired or anxious — hyperthyroidism symptoms that are often misattributed to stress.
TSH testHair thinning and dry, coarse skin are classic hypothyroid symptoms — the thyroid affects every cell in the body.
TSH + free T4Both hypothyroidism and hyperthyroidism disrupt the menstrual cycle — thyroid testing is part of any irregular period investigation.
TSH + hormonal assayUnderstanding what each component of the test measures helps you understand your results.
The most important screening test. High TSH = underactive thyroid; low TSH = overactive thyroid. TSH changes before T4 or T3, making it the earliest indicator.
The main thyroid hormone. Low free T4 with high TSH confirms hypothyroidism. High free T4 with low TSH confirms hyperthyroidism.
The active form of thyroid hormone. Important in hyperthyroidism assessment and in patients with ongoing symptoms despite normal TSH and T4.
Elevated antibodies diagnose autoimmune thyroid disease — Hashimoto's (hypothyroid) or Graves' disease (hyperthyroid). Important for prognosis and management.
| TSH level | Interpretation | Common cause |
|---|---|---|
| <0.4 mIU/L | Hyperthyroidism (overactive) | Graves' disease, toxic nodule |
| 0.4–4.0 mIU/L | Normal | Normal thyroid function |
| >4.0–10 mIU/L | Subclinical hypothyroidism | Early Hashimoto's |
| >10 mIU/L | Hypothyroidism | Hashimoto's, iodine deficiency, post-treatment |
Eat and drink normally.
TSH is slightly higher in the morning — morning tests are slightly more sensitive, but not essential.
If you are already on levothyroxine or carbimazole, take your usual dose and inform our doctor.
52 Sholanke Street, Akoka, Mon–Sat 9AM–5PM.
We provide TSH, free T4, free T3, and antibody testing — with interpretation in the context of your symptoms.
Hypothyroidism is one of the most commonly missed diagnoses in Lagos women — treated with levothyroxine, a once-daily tablet that restores normal thyroid function and resolves all symptoms within 4–8 weeks.
TSH and free T4 with same-day results at Mascot Healthcare, Akoka.