T3 T4 Ratio Calculator

Formula

The formula to calculate the T3 T4 Ratio (R) is:

\[ \text{R} = \frac{\text{T3}}{\text{T4}} \]

Where:

\(\text{R}\) is the T3 T4 ratio
\(\text{T3}\) is the level of triiodothyronine in the blood (ng/dL)
\(\text{T4}\) is the level of thyroxine in the blood (μg/dL)

T3 T4 Ratio Definition

A T3 T4 ratio is a medical test that measures the levels of two hormones produced by the thyroid gland: triiodothyronine (T3) and thyroxine (T4). This ratio is used to evaluate thyroid function and diagnose thyroid disorders. A high or low T3 T4 ratio can indicate hyperthyroidism or hypothyroidism, respectively. It can also help in assessing the severity of thyroid dysfunction and monitoring the effectiveness of treatment.

Example Calculation

Let's assume the following values:

Triiodothyronine (T3) = 150 ng/dL
Thyroxine (T4) = 8 μg/dL

Using the formula:

\[ \text{R} = \frac{150}{8} = 18.75 \]

The T3 T4 Ratio (R) is 18.75.