TSH Thyroid Test — How to Detect Hypothyroidism with a Home Blood Test?

The thyroid — a small gland with a huge role

The thyroid is a small butterfly-shaped gland located on the front of the neck. Despite weighing only 15-25 g, it produces hormones (T3 and T4) that regulate the metabolism of every cell in the body: heart rate, body temperature, weight, mood, energy, bowel function, reproductive health, and much more.

Thyroid diseases are among the most common endocrine disorders. In Poland, thyroid problems affect approximately 2-3 million people, with women being 5-8 times more likely to be affected than men. The most common condition is hypothyroidism — a state where the gland produces too few hormones.

TSH (thyroid-stimulating hormone) is the key parameter in thyroid diagnostics. Produced by the pituitary gland, TSH "tells" the thyroid how much hormone to make. When the thyroid slows down, the pituitary increases TSH production — trying to stimulate it. That's why elevated TSH is the earliest signal of hypothyroidism.

Symptoms of hypothyroidism

Hypothyroidism develops slowly and its symptoms are often non-specific, making diagnosis difficult. Patients frequently spend years being treated for "depression," "fatigue," or "weight problems" before someone checks the thyroid.

Classic symptoms of hypothyroidism: chronic fatigue, sleepiness, apathy; weight gain despite normal diet; cold intolerance (constant feeling of being cold); dry skin, brittle nails, hair loss; constipation; swelling (especially face and eyelids); decreased libido, menstrual irregularities; slow speech and thinking, "brain fog"; elevated cholesterol; bradycardia (slow heart rate).

The most common cause of hypothyroidism in Poland is Hashimoto's disease — an autoimmune thyroiditis where the immune system attacks its own gland.

How does the home TSH test work?

The OTS-402H test detects elevated TSH (above 5 µIU/mL) in a capillary blood sample from the fingertip.

The procedure is similar to the ferritin test: wash hands with warm water, clean finger with alcohol swab, prick with lancet (side of ring finger), collect blood with capillary pipette to marked line, transfer to cassette well, add 2 drops of buffer, and read after 10 minutes.

Interpretation: Two lines (C + T) = TSH elevated above 5 µIU/mL — possible hypothyroidism, contact a doctor. Only C line = TSH in normal range below 5 µIU/mL.

The test is CE0123 certified (TÜV SÜD). TSH has a natural circadian rhythm (highest at night, lowest in afternoon), so testing in the morning is optimal.

Elevated TSH — what's next?

Elevated TSH on a home test is an important signal, but not a diagnosis. Further steps:

1. Visit a doctor (endocrinologist or internist) — they'll order a full profile: TSH (exact value), fT4 (free thyroxine) — low fT4 with high TSH = overt hypothyroidism, fT3 (free triiodothyronine), Anti-TPO and Anti-TG — antibodies typical of Hashimoto's.

2. Thyroid ultrasound — assessment of size, structure, and any nodules.

3. Treatment: Standard is levothyroxine (Euthyrox, Letrox) — synthetic T4 hormone taken daily in the morning on an empty stomach, 30 minutes before eating. Dose individualized, with TSH monitoring every 6-8 weeks until stabilized.

4. Lifestyle: selenium (200 µg/day — reduces anti-TPO titers in Hashimoto's), vitamin D3, avoid excess iodine (can paradoxically worsen Hashimoto's), stress reduction.

Related product

• TSH Thyroid Test 20.00 PLN

Frequently asked questions

Is TSH of 5 already hypothyroidism?

TSH 5-10 µIU/mL with normal fT4 is called subclinical (latent) hypothyroidism. It doesn't always require treatment but needs monitoring. TSH above 10 µIU/mL usually requires levothyroxine therapy.

Can I have hyperthyroidism?

The iLabU test detects elevated TSH, meaning hypothyroidism. Hyperthyroidism (Graves' disease) causes low TSH — it won't be detected by this test. If you suspect hyperthyroidism (weight loss, palpitations, hand tremors, hyperactivity), consult a doctor.

How often should I check TSH?

People with diagnosed thyroid disease should check TSH every 6-12 months. Healthy individuals with risk factors (family history of Hashimoto's, women over 35) should check every 1-2 years. The home test is a convenient self-screening tool.