The thyroid gland size in normal persons found on ultrasound correlates with the person's body weight and age. Differences between men and women can be explained solely by the difference body weight.
Hegedus Equation
thyroid volume in mL =
= 1.97 + (0.21 * (body weight in kilograms)) + (0.06 * (age in years))
Berghout Equation
thyroid volume in mL =
= 2.772 + (0.158 * (body weight in kilograms)) + (0.042 * (age in years))
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