What happens after I get my results?

You'll get easy-to-understand doctor notes that explain your Free T3 levels and how they relate to symptoms like fatigue, weight changes, or feeling cold. The notes provide actionable guidance on diet, supplements, lifestyle adjustments, or when to follow up with an endocrinologist. Along with your standard lab report, you can use our trends feature to monitor your thyroid levels over time, especially helpful if you're making lifestyle changes or on thyroid medication.

Who should consider getting this test?

This test is ideal for people experiencing unexplained fatigue, difficulty losing weight, feeling cold all the time, or brain fog despite normal TSH levels. It's also valuable for those already on thyroid medication who still have symptoms, anyone with a family history of thyroid disease, or people with suspected protein binding abnormalities that affect thyroid hormone function.

What symptoms indicate I may need this test?

Common symptoms include persistent tiredness that doesn't improve with sleep, unexplained weight gain or difficulty losing weight despite diet and exercise, feeling unusually cold, dry skin and hair, brain fog or difficulty concentrating, and mood changes like depression or irritability. You might also experience constipation, muscle weakness, or slower heart rate.

How can I naturally support my thyroid function?

Supporting thyroid health starts with ensuring adequate selenium and zinc intake through foods like Brazil nuts, shellfish, eggs, and pumpkin seeds. Managing stress through yoga, meditation, or regular exercise helps balance thyroid hormones. Getting 7-8 hours of quality sleep, limiting processed foods and excessive soy, and maintaining a healthy weight can also support optimal thyroid function.

What is Free T3 and why does it matter?

Free T3 is the active, unbound form of thyroid hormone that your cells actually use to regulate metabolism, energy production, and body temperature. Unlike total T3, Free T3 measures only the hormone available to enter your cells and do its job. It's the most metabolically active thyroid hormone and gives the clearest picture of your body's actual metabolic speed and energy capacity.

What does high Free T3 mean?

High Free T3 often indicates hyperthyroidism, where your thyroid is overactive and speeding up your metabolism too much. This can cause symptoms like unexplained weight loss, rapid heartbeat, anxiety, tremors, increased sweating, and difficulty sleeping. It can also occur with certain thyroid medications or supplements if the dose is too high.

What does low Free T3 mean?

Low Free T3 can indicate your body isn't converting thyroid hormone efficiently, even if other thyroid tests are normal. This can happen with chronic stress, severe dieting, nutritional deficiencies, or certain medications. Low Free T3 explains why some people have hypothyroid symptoms like fatigue and weight gain despite normal TSH levels.