Description
The Thyroid Function Test (TFT) Panel is a foundational diagnostic blood test that measures three essential hormones: Total Triiodothyronine (T3), Total Thyroxine (T4), and Thyroid-Stimulating Hormone (TSH). Designed to evaluate overall thyroid health, this panel is critical for diagnosing hypothyroidism, hyperthyroidism, and subclinical metabolic disorders. Fast, highly accurate reports delivered directly to you with convenient home blood sample collection across Kashmir.
What is the Thyroid Function Test (TFT) Panel?
The thyroid is a small, butterfly-shaped gland located at the base of your neck that acts as the master metabolic thermostat for your entire body. The hormones it produces regulate energy generation, heart rate, body temperature, digestive speed, and mood. The TFT Panel evaluates this delicate hormonal feedback loop between your brain and your thyroid gland by measuring three specific markers:
TSH (Thyroid-Stimulating Hormone): Produced by the pituitary gland in the brain, TSH acts as the messenger telling the thyroid gland how much hormone to produce. It is the most sensitive early indicator of thyroid dysfunction.
Total T4 (Thyroxine): The primary inactive hormone produced directly by the thyroid gland, which circulates in the bloodstream and converts into active T3 as needed by body tissues.
Total T3 (Triiodothyronine): The active thyroid hormone responsible for directly stimulating cellular metabolism and energy production across organs.
Why is This Test Ordered?
Your physician, endocrinologist, or gynecologist may recommend a comprehensive TFT panel for several clinical reasons:
Screening for Hypothyroidism (Underactive Thyroid): Investigating persistent symptoms such as chronic fatigue, unexplained weight gain, sensitivity to cold weather, dry skin, hair fall, depression, and constipation.
Screening for Hyperthyroidism (Overactive Thyroid): Evaluating symptoms like rapid or irregular heartbeat (palpitations), sudden weight loss despite an increased appetite, anxiety, tremors, sweating, and sleep disturbances.
Maternal & Fertility Health: Monitoring thyroid levels during pregnancy planning, early gestation, or when investigating irregular menstrual cycles and fertility challenges.
Medication Management: Tracking the efficacy of thyroid hormone replacement therapy (e.g., Thyronorm, Eltroxin) or anti-thyroid medications to optimize daily dosing.
Test Specifications & Patient Guidelines
| Parameter | Specification |
| Sample Type | Serum (Serum Separator Tube – SST or Plain Red Top) – 3 mL venous blood. |
| Preparation / Fasting | No strict fasting required. However, a morning sample before breakfast is generally preferred for baseline TSH accuracy. |
| Important Lab Note | Avoid Biotin Supplements: If you take high-dose biotin (Vitamin B7) hair/skin supplements, discontinue them 48 hours prior to blood draw, as they can interfere with immunoassay readings. |
| Methodology | Chemiluminescence Immunoassay (CLIA) / Electrochemiluminescence (ECLIA) |
| Recommended For | Routine metabolic screening, fatigue evaluation, maternal care, and thyroid disease tracking |
| Report Turnaround Time | Same Day / Within 24 Hours (Rapid clinical processing) |
| Home Sample Collection | Available across Srinagar and surrounding districts via Kashmir Online Lab |
Part 2: Interpretive Reference Ranges & Clinical Guidance
Include this reference guide on your product page to help patients and referring physicians interpret their laboratory reports.
1. Standard Adult Reference Ranges
(Note: Exact numerical ranges may vary slightly depending on the analytical reagent kit used in your laboratory).
| Hormonal Marker | Expected Reference Range | Units |
| TSH (Thyroid-Stimulating Hormone) | 0.40 – 4.20 | µIU/mL (or mIU/L) |
| Total T3 (Triiodothyronine) | 80 – 200 | ng/dL |
| Total T4 (Thyroxine) | 5.0 – 12.0 | µg/dL (or mcg/dL) |
2. Clinical Interpretation Breakdown
| TSH Level | T3 & T4 Levels | Probable Clinical Interpretation |
| Elevated (High) | Decreased (Low) | Primary Hypothyroidism: The thyroid gland is failing to produce adequate hormone, causing the pituitary gland to pump out excess TSH to stimulate it. |
| Elevated (High) | Normal | Subclinical Hypothyroidism: An early or mild stage of thyroid failure. Common in autoimmune conditions like Hashimoto’s Thyroiditis. |
| Decreased (Low) | Elevated (High) | Primary Hyperthyroidism: The thyroid is producing excessive hormones (often seen in Graves’ Disease), causing the brain to shut down TSH production. |
| Decreased (Low) | Normal | Subclinical Hyperthyroidism: Early-stage overactivity of the thyroid gland or over-supplementation with thyroid replacement medication. |
| Normal | Normal | Euthyroid (Healthy): Normal thyroid gland function and balanced metabolic regulation. |
