A Patient Has a Free T₄ Level of 0

question 11

Multiple Choice

A patient has a free T₄ level of 0.6 ng/dL and a free T₃ of 220 pg/dL. The patient asks the nurse what these laboratory values mean. How will the nurse respond?

• A) "These laboratory values indicate that you may have Graves' disease."
• B) "These results suggest you may have hyperthyroidism."
• C) "We will need to obtain a total T₄ and a total T₃ to tell for sure."
• D) "We will need to obtain a TSH level to better evaluate your diagnosis."

---

Definitions:

Difference Scores

Values obtained by subtracting one set of observations from another, useful in measuring changes or effects in paired data.

α

Represents the level of significance in hypothesis testing, indicating the probability of rejecting a true null hypothesis.

Degrees of Freedom

Degrees of freedom refer to the number of independent values or quantities that can be assigned to a statistical distribution while still satisfying a given number of constraints.

T-test for Dependent Means

A statistical method used to compare the means of two related groups.