iScreen Comprehensive Thyroid Panel

What It Is

The most thorough thyroid blood panel available, going far beyond the standard TSH test your GP typically orders. This panel assesses full thyroid hormone production, conversion, utilisation and autoimmune activity, giving a complete picture of how your thyroid is actually performing at every step.

What It Measures

Thyroid Function

  • TSH (thyroid stimulating hormone)

  • Free T4

  • Free T3

Reverse T3

  • Reverse T3 (rT3)

  • Free T3 to reverse T3 ratio

Reverse T3 is an inactive form of thyroid hormone that blocks the action of active T3. When the body converts too much T4 into rT3 instead of active T3, you can experience hypothyroid symptoms even when your TSH and T4 levels look completely normal.

Thyroid Antibodies

  • TPO antibodies (thyroid peroxidase)

  • TG antibodies (thyroglobulin)

  • TSI (thyroid-stimulating immunoglobulin)

These markers detect autoimmune thyroid conditions like Hashimoto's thyroiditis and Graves' disease, often years before standard thyroid tests show anything abnormal.

Who This Is For

  • Fatigue, weight gain or weight loss resistance

  • Hair thinning, dry skin or cold intolerance

  • Constipation, anxiety or heart palpitations

  • Brain fog, mood changes or difficulty sleeping

  • Menstrual irregularities

  • You have had "normal" thyroid results on standard testing but still feel unwell

  • Family history of thyroid disease

  • Suspected autoimmune component to your health picture

Why It Matters

Your thyroid governs the speed of virtually every process in your body. Metabolism, energy, temperature regulation, cognitive function, hormonal balance and heart rate all depend on it. Standard thyroid testing only checks TSH and sometimes T4, which means conversion problems, reverse T3 dominance and early autoimmune destruction are routinely missed. This test reveals the full story, so we can identify exactly where the system is breaking down and intervene with precision.

How It Works

  • Order through the Genesis Functional Health website

  • Your pathology form will be emailed to you within 24 hours of payment

  • Download and print the form, or check with your local Laverty collection centre as some may accept the form via email

  • No fasting required, but avoid biotin supplements (typically contained in B-complex, multivitamin or hair, nail, and skin supplements) for 72 hours before your blood draw, as biotin can interfere with thyroid assay accuracy

  • Take your form to a Laverty collection centre

  • Once your results come through to me, a follow-up consultation is booked to interpret your results in detail and discuss treatment options