T3 T4 Ratio Calculator

The T3/T4 ratio is a crucial marker in thyroid function testing. It gives insights into how well the body converts T4 (thyroxine) into T3 (triiodothyronine), the active hormone.

Background on T3 and T4

T3 and T4 are hormones produced by the thyroid gland. While T4 is the primary hormone produced, T3 is more biologically active. The body converts T4 into T3 as needed. The T3/T4 ratio helps assess this conversion process.

Calculation Formula

The formula for calculating the T3/T4 ratio is straightforward:

\[ \text{T3/T4 Ratio} = \frac{\text{T3 Level (ng/dL)}}{\text{T4 Level (ng/dL)}} \]

Example Calculation

If your T3 level is 100 ng/dL and your T4 level is 7 ng/dL, the calculation would be:

\[ \text{T3/T4 Ratio} = \frac{100}{7} \approx 14.29 \]

Importance and Interpretation

A high T3/T4 ratio could indicate excessive T4 conversion, while a low ratio may suggest conversion issues or hypothyroidism. This ratio should be interpreted alongside other thyroid markers and clinical symptoms.

Common FAQs

1. What is considered a normal T3/T4 ratio?

   • The normal range varies, but ratios between 10 to 20 are often seen as typical. Clinical context matters.

2. Can this ratio alone diagnose thyroid conditions?

   • No, this ratio is a piece of the puzzle. Full thyroid panels and symptoms should be considered.

3. What should I do if my ratio is abnormal?

   • Consult your healthcare provider for further evaluation and testing.