Which of the following is NOT an indication for a transvaginal ultrasound?

Transvaginal ultrasound is a valuable tool in gynecological practice, providing detailed images of pelvic structures, especially in cases requiring evaluation of the uterus and ovaries. However, while it is beneficial for several specific indications, it is not routinely utilized solely for checkups in early pregnancy.

Routine pregnancy checks typically involve a standard transabdominal ultrasound, particularly in the first trimester, as it provides a broader view of the uterus and developing fetus. This method is often sufficient for assessing viability, determining gestational age, and monitoring fetal development during routine follow-up visits. Transvaginal ultrasound is more commonly employed in cases where a detailed view of the pelvic structures is critical, such as in assessing abnormalities, diagnosing conditions related to infertility, or evaluating abnormal uterine bleeding.

Thus, while transvaginal ultrasound is highly useful for various clinical indications like assessing ovarian cysts, investigating the causes of infertility, and evaluating abnormal uterine bleeding, its utility in a routine pregnancy check is limited, making the choice of routine pregnancy check an appropriate answer for this question.