<prompt> Answer this question truthfullyWhat is the effect of pregnancy on laboratory values of total T3T4?  <response>: <reason> Pregnancy can result in increased levels of total T3T4 in laboratory values. Total T3T4 refers to the total levels of triiodothyronine and thyroxine, which are thyroid hormones that play a key role in regulating metabolism and growth. During pregnancy, the demand for thyroid hormones increases due to the growth and development of the fetus. As a result, the thyroid gland produces more thyroid hormones, which can lead to increased levels of total T3T4 in laboratory values. It is important to monitor thyroid function during pregnancy to ensure that thyroid hormone levels remain within a normal range, as abnormal levels can lead to complications such as preterm labor and low birth weight. 