Dating Scan Referral

• Irregular periods
• Unclear or unknown last menstrual period (LMP)
• Bleeding or pain during early pregnancy
• History of previous miscarriage
• Conception through IVF or other assisted reproductive methods
• To assess viability in the early stages of pregnancy

• Gestational age- Determines the stage of pregnancy by measuring the baby (usually crown-rump length).
• Fetal heartbeat- Confirms the baby’s heart is beating.
• Estimated due date (EDD)- Provides a projected due date based on fetal size measurements.
• Number of embryos- Establishes whether there is one baby or more than one.
• Pregnancy location- Ensures the pregnancy is located within the uterus.

The type of scan depends on the stage of pregnancy.

• Transabdominal ultrasound- A probe is gently moved over the lower abdomen; it usually requires a full bladder.
• Transvaginal ultrasound- A narrow probe is inserted into the vagina to obtain clearer images, especially in early pregnancy.

The results confirm the stage of pregnancy, estimate the due date, and check for a fetal heartbeat. It also ensures the pregnancy is inside the uterus and identifies whether there is one baby or more.

• Scans performed very early may not detect a heartbeat.
• The due date may be revised slightly as the pregnancy advances.
• Image quality can be influenced by body size or bladder fullness.
• The scan does not assess detailed anatomy; it is evaluated during later scans.

• For a transabdominal scan- Drink ample water an hour before the scan and do not empty your bladder.
• For a transvaginal scan- You may need to empty your bladder before the scan.
• Wear easy, comfortable clothing.
• Bring your referral and any previous pregnancy records.
• Follow all instructions from your doctor or imaging clinic.