Dating Scan (8-22 Weeks)
The Dating Scan is a pregnancy ultrasound performed between 8 and 22 weeks, used to confirm gestational age, estimate the due date, and assess early pregnancy development.
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Details about Dating Scan (8-22 Weeks)
What is a Dating Scan (8–22 Weeks)?
A Dating Scan is an early pregnancy ultrasound carried out between 8 and 22 weeks of gestation to accurately determine how far along the pregnancy is. It measures the baby’s size and development to calculate the estimated due date (EDD).
In early pregnancy, the scan typically measures the crown–rump length (CRL), which provides the most accurate dating. Later in the window, additional measurements may be used to confirm gestational age. The scan also confirms the presence of a heartbeat, the number of babies, and whether the pregnancy is developing within the uterus.
Dating scans are a key part of antenatal care and help ensure all future pregnancy assessments and screening tests are timed correctly.
When a Dating Scan is recommended
A Dating Scan is commonly recommended in early pregnancy or when gestational age is uncertain.
You may be advised to have this scan if you:
- Have a positive pregnancy test
- Are unsure of the date of your last menstrual period
- Have irregular menstrual cycles
- Want confirmation of gestational age
- Need accurate dating for antenatal screening
- Have experienced early pregnancy symptoms
- Have had previous pregnancy complications
- Want reassurance in early pregnancy
What the Dating Scan assesses
The scan provides information on:
- Gestational age and estimated due date
- Presence of fetal heartbeat
- Number of embryos (singleton or multiple pregnancy)
- Early fetal development
- Position of the pregnancy within the uterus
Depending on gestation, the scan may be performed transabdominally or transvaginally for optimal image quality.
Benefits of a Dating Scan (8–22 Weeks)
- Accurate estimation of due date
Provides reliable pregnancy dating. - Confirms pregnancy viability
Identifies fetal heartbeat and development. - Detects multiple pregnancies early
Important for pregnancy planning. - Supports correct timing of screening tests
Ensures anomaly and blood tests are scheduled correctly. - Provides early reassurance
Offers peace of mind in early pregnancy. - Non-invasive and safe
Uses ultrasound, not radiation. - Quick and well tolerated
Usually completed within 15–25 minutes. - Foundation for ongoing antenatal care
Guides future pregnancy monitoring.
How the Dating Scan is performed
Home-Based Ultrasound Scans (UK-wide)
- Book your ultrasound appointment online or by phone
- A qualified clinician travels to your home or chosen location
- The scan is performed in the comfort and privacy of your home
- Scan duration varies by examination type (typically 10–30 minutes)
- Findings are explained during or shortly after the scan
Important:
All ultrasound scans are provided as home-visit services only. This service is available UK-wide, allowing you to access diagnostic imaging without attending a clinic.
Understanding your Dating Scan results
Normal findings
Measurements match expected gestational age and a heartbeat is present.
Typical report:
- Pregnancy dated at X weeks with normal development
Adjusted gestational age
Measurements suggest a different gestational age than expected.
Typical report:
- Estimated due date adjusted
This is common and helps improve pregnancy accuracy.
Early pregnancy concerns
In some cases, development may require follow-up.
Typical report:
- Follow-up scan recommended
Results are explained in context and next steps discussed if needed.
How It Works
Simple steps to get your results
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Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
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Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
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WhatsApp UsHow to Prepare for Your Test
Follow these guidelines for accurate results
Sample Timing
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting & Hydration
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Medications & Supplements
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
Hormones & Menstrual Cycle
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.