Which investigation is essential for managing early pregnancy bleeding?

Transvaginal ultrasound is crucial for managing early pregnancy bleeding as it allows for a detailed visualization of the uterus and can help identify the location and viability of the pregnancy. This imaging technique is particularly important in distinguishing between an intrauterine and an ectopic pregnancy, as well as assessing for any abnormalities such as retained products of conception or signs of miscarriage.

In cases of early pregnancy bleeding, a transvaginal ultrasound can provide immediate insights that are vital for determining appropriate management and the next steps in care. It can also evaluate the presence of a fetal heartbeat, which is an important factor in assessing the outcome of the pregnancy.

While other tests like complete blood count, urinalysis, and thyroid function tests may provide useful information in certain contexts, they do not have the same immediate relevance in addressing the urgent need to assess the status of the pregnancy in the context of bleeding.