The ultrasound examination might be a screening or a diagnostic examination and depending on the place of it we differentiate between transvaginal – (TVS) and transabdominal – (TAS) ultrasound examinations.
The aim of these ultrasound examinations is to explore healthy or unhealthy status of the lesser pelvis and to find genetic abnormalities or other pathological status of the pregnancy according to the proper gestational age.
Diagnostic ultrasound examination: Beyond all the recommended screenings during pregnancy, we consider every further type of ultrasound examination a diagnostic examination which is necessary because of some complaints, clinical symptoms, or on basis of other prenatal tests, or in cases which arise during tests.
Transvaginal ultrasound examination: It is the most practical way to do ultrasound diagnostics of the lesser pelvis organs (the higher ultrasound frequency – 5,0–6,5–7,5–9,0 MHz – gives a more detailed picture).
Gynaecologic transvaginal ultrasound examination becomes necessary in case of hemorrhage problems, pain in lesser pelvis, infertility or screenings. Obstetric transvaginal ultrasound examination is used mainly in early pregnancy (before the 12th gestational week) to make diagnosis although in certain cases it can be used in later stages of pregnancy too (to examine the cervical orifice or placenta adhesion).
Abdominal ultrasound examination is done in obstetric practice, after the 16th gestational week or in certain cases in gynaecologic practice if the transvaginal examination is hindered, or if the bladder is full.