Thyroid Tests (TSH, T3, T4)
A group of blood markers that assess how the thyroid gland is regulating metabolism, energy, and hormone balance.
This is educational information, not a diagnosis. Only a doctor reviewing your full report and history can properly interpret your result.
What It Is
Thyroid testing usually starts with TSH (thyroid-stimulating hormone), the pituitary signal that tells the thyroid how much hormone to produce, and may be followed by T3 and T4, the hormones the thyroid actually releases.
Why It Matters
Because the thyroid influences metabolism, energy, weight, and mood, both an underactive and overactive thyroid can cause a wide range of symptoms — and TSH is often the earliest marker to shift.
Typical Reference Range
TSH reference ranges are commonly cited in the region of roughly 0.4-4.0 mIU/L, though exact cutoffs vary by lab, age, and whether pregnancy is a factor.
What Can Affect Your Results
- Autoimmune thyroid conditions
- Iodine intake
- Certain medications
- Pregnancy
- Time of day the sample is taken, since TSH fluctuates
When It's Typically Checked
Thyroid tests are commonly ordered when fatigue, weight changes, or mood shifts are being investigated, and TSH is often part of routine wellness screening.
Medical Disclaimer
This page is provided for general educational purposes only and does not diagnose, treat, or interpret your individual results. Reference ranges vary between laboratories and testing methods, and a result outside a ‘typical’ range does not necessarily indicate a health problem, just as a result inside it doesn’t rule one out. Only a qualified physician reviewing your complete health picture can properly interpret your lab results — please discuss your reports with Dr Naturals or your treating doctor rather than relying on this page alone.