Dating Scan: Accurate Gestational Age & Expected Delivery Date
A Dating Scan is an important early pregnancy ultrasound used to accurately determine gestational age and calculate the Expected Date of Delivery (EDD). It helps establish a reliable pregnancy timeline, which is essential for proper antenatal care and monitoring.
What Is a Dating Scan?
A dating scan is an ultrasound performed in early pregnancy, typically between 7 to 10 weeks, to determine:
- Exact gestational age
- Expected due date (EDD)
- Normal early fetal growth
- Number of embryos (single or multiple pregnancy)
It is considered the most accurate method for pregnancy dating.
Why Is a Dating Scan Important?
1. Accurate Due Date Calculation
Unlike LMP-based dating (last menstrual period), a dating scan provides a precise EDD, especially helpful if cycles are irregular.
2. Confirms Healthy Early Growth
The scan measures the Crown-Rump Length (CRL), which is the most reliable indicator of gestational age in early pregnancy.
3. Identifies Multiple Pregnancies
Twin or multiple pregnancies can be accurately identified during this scan.
4. Guides Future Pregnancy Care
Correct dating helps:
- Schedule important scans (NT, anomaly scan)
- Monitor fetal growth accurately
- Reduce unnecessary interventions due to wrong dates
When Is a Dating Scan Done?
| Gestational Week | Purpose |
|---|---|
| 7–8 weeks | Best accuracy for CRL measurement |
| 9–10 weeks | Confirms growth and due date |
| After 10 weeks | Less accurate for dating |
For best results, dating scans are recommended before 10 weeks.
How Is a Dating Scan Performed?
1. Transvaginal Ultrasound
- Preferred before 9 weeks
- Provides clear fetal measurements
- Safe and painless
2. Abdominal Ultrasound
- Used after 9–10 weeks
- May require a full bladder
The method depends on gestational age and clinical need.
What to Expect During the Scan
- Scan duration: 10–15 minutes
- Non-invasive and safe
- Immediate results
- Measurements taken include CRL and gestational sac size
Is a Dating Scan Safe?
Yes. Dating scans use ultrasound technology, which is completely safe for both the mother and the developing baby.
Who Should Get a Dating Scan?
A dating scan is especially recommended if:
- Menstrual cycles are irregular
- You are unsure of your LMP
- Pregnancy is conceived after fertility treatment
- There is a history of miscarriage
- Multiple pregnancy is suspected
FAQs – Dating Scan
What is a Dating Scan?
A scan that accurately determines gestational age and calculates the expected delivery date.
When is a Dating Scan performed?
Typically between 7–13 weeks of pregnancy.
Why is a Dating Scan important?
It confirms due date, checks fetal growth, and can detect multiple pregnancies.
Is the scan safe for the baby?
Yes, it is non-invasive and safe.
Can the Dating Scan detect abnormalities?
It may identify major early structural issues but is primarily for dating and growth assessment.
Conclusion
A Dating Scan is a vital part of early pregnancy care, ensuring accurate gestational dating and a reliable expected delivery date. It helps plan future scans, monitor fetal growth effectively, and supports a healthy pregnancy journey from the very beginning.
For expert pregnancy scans and antenatal care, visit: www.genesisshospital.com | www.drdivyagynecologist.com | www.drrajuuro.com
Dr. Divya J G Dr. Divya J G is an exceptional and highly skilled Obstetrician & Gynaecologist, recognised for her expertise in maternity care, pregnancy scans, and advanced gynaecological and laparoscopic surgeries. She completed her MBBS at Mysore Medical College and Research Institute (MMCRI) and earned her MS in Obstetrics and Gynaecology from Bangalore Medical College. With over 13 years of clinical experience, Dr. Divya J G is known for her meticulous attention to detail and patient-centred approach. She carefully understands each woman’s unique health needs and delivers personalised, evidence-based care to ensure safe pregnancies, effective treatments, and optimal outcomes.
Dr. Divya J G has extensive experience in managing a wide range of obstetric and gynaecological cases, including comprehensive maternity care, gynaecological surgeries, infertility evaluation, and IVF-related treatments. Beyond her clinical expertise, she is known for building strong trust and confidence among her patients through compassionate, patient-centred care and clear communication. From fertility counselling and conception planning to pregnancy, delivery, and post-treatment recovery, Dr. Divya J G ensures that every woman feels well-informed, supported, and at ease throughout her medical journey. Her commitment to ethical practice and evidence-based treatment consistently contributes to positive patient experiences and successful outcomes.
