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6–12 Weeks of Pregnancy
(Ideally 8–10 Weeks)
~15 Minutes
(Full Scan Duration)
±3–5d Dating Accuracy
(CRL Measurement)
100% Safe — Sound Waves
No Radiation
What is a Dating Scan?

Your First Look —
and Your Most Important Foundation

A dating scan is your pregnancy's first ultrasound — performed between 6 and 12 weeks to confirm the pregnancy is developing normally, detect your baby's heartbeat, and calculate the accurate gestational age and estimated due date (EDD).

The single most important measurement is the Crown-Rump Length (CRL) — the measurement of your baby from the top of the head to the bottom, measured on ultrasound. At 8–10 weeks, CRL provides a dating accuracy of ±3–5 days — far more precise than calculating from the last menstrual period (LMP), which can be off by 2–3 weeks in women with irregular cycles.

At Mayflower Fetal Medicine Centre, every dating scan is performed by Dr. Kunda Shahane on the GE Voluson Signature Expert — providing exceptional image quality even in early pregnancy, for the most accurate CRL measurement and the clearest possible view of your baby's first moments.

Dating Scan — At a Glance
When: 6–12 weeks of pregnancy (ideally 8–10 weeks for best CRL accuracy)
Also called: Viability scan, early pregnancy scan, CRL scan, first trimester scan
Key measurement: Crown-Rump Length (CRL) — most accurate dating available
Approach: Transabdominal (8+ weeks) or transvaginal (6–8 weeks) as needed
Duration: Approximately 15 minutes
IVF pregnancies: Essential even with known embryo transfer date — CRL confirms development
Safety: Completely safe — diagnostic ultrasound, no radiation, no risk
What You Learn

7 Things Your Dating Scan
Confirms in One Appointment

A well-performed dating scan provides seven essential pieces of information — each one important in its own right, and each one forming the foundation for everything that follows in your pregnancy.

01 📍
Pregnancy Location
Confirms the pregnancy is developing inside the uterus — and is not an ectopic pregnancy (in the fallopian tube or elsewhere), which is a medical emergency requiring immediate treatment.
02 ❤️
Fetal Heartbeat
Detecting your baby's heartbeat on ultrasound — the most emotionally significant moment of the early scan. A heartbeat confirmed by 7–8 weeks is highly reassuring about the ongoing viability of the pregnancy.
03 📏
Gestational Age
The Crown-Rump Length (CRL) measurement gives your exact gestational age in weeks and days — accurate to ±3–5 days. This is significantly more reliable than calculating from the last menstrual period.
04 📅
Estimated Due Date
Your EDD (Estimated Due Date) is calculated from the CRL measurement. This date becomes the reference point for all subsequent scans, screening tests, and delivery planning throughout your pregnancy.
05 👶
Number of Babies
Confirms whether you are carrying one baby, twins, or triplets. In twins, the chorionicity (whether they share a placenta) is determined — a critical factor for the entire management of a twin pregnancy.
06 🔬
Early Anatomy Check
A basic structural check of the visible anatomy — confirming the head, body, and limb buds are forming normally. A full structural survey is done at the anomaly scan (18–22 weeks), but early reassurance has great value.
07 🏥
Uterus & Ovaries
A basic maternal assessment — checking for fibroids, ovarian cysts, or other uterine abnormalities that may need to be monitored. Some findings at this stage guide management decisions for the rest of the pregnancy.
Timing

When Is the Right Time
for Your Dating Scan?

The best timing depends on what you need from the scan. Here is how the early pregnancy scan window divides into three phases, each with a different primary purpose.

6–7 Weeks
Viability Scan
The primary purpose is to confirm the pregnancy is intrauterine (not ectopic), detect an early heartbeat, and identify the number of gestational sacs. CRL dating is possible but less accurate this early.
Best for: Confirming heartbeat
8–10 Weeks
Ideal Dating Window
CRL measurement is at its most accurate — within ±3–5 days. The baby is clearly visible on transabdominal scan. Heartbeat is strong and easily confirmed. Twin chorionicity is best assessed now.
⭐ Most Accurate Dating
11–12 Weeks
Late Dating / NT Overlap
CRL is still valid for dating up to 84 mm (approximately 13 weeks 6 days). From 11 weeks, the NT scan window opens — so a single appointment at 11–12 weeks can serve as both dating and early NT assessment.
Combines with NT Scan
Important: If you have irregular periods, a history of miscarriage, pelvic pain or bleeding, or have undergone IVF or fertility treatment, an early viability scan at 6–8 weeks is highly recommended — do not wait for the "ideal" 8–10 week window.
Scan Approach

Transvaginal vs Transabdominal —
Which Approach Will Be Used?

Dr. Kunda Shahane uses whichever approach gives the clearest view of your baby. Both are safe and well-tolerated. She will always explain what she is about to do before beginning.

Before 8 Weeks
Transvaginal (TVS)

A smooth, thin ultrasound probe is gently placed inside the vagina — closer to the uterus. In very early pregnancy (6–8 weeks), when the baby is the size of a small grape, this approach provides a much clearer image than scanning through the abdomen.

A transvaginal scan is not painful, though it may feel slightly uncomfortable for a moment. It is completely safe for the pregnancy — the probe does not touch the cervix or disturb the pregnancy in any way.

Empty bladder preferred · More detail in early weeks · Completely safe
From 8 Weeks Onwards
Transabdominal (TAS)

The ultrasound probe is placed on the skin of the abdomen, with a small amount of gel. From 8 weeks, this approach gives excellent views of the baby and the entire uterus. It is the approach most people expect when they think of an ultrasound scan.

A moderately full bladder helps push the uterus upward and improves the image quality. If the view is not clear enough transabdominally — for example due to the position of the uterus — a transvaginal approach may be used as well.

Moderately full bladder · Comfortable · Standard approach from 8 weeks
Why Dating Accuracy Matters

The Foundation Every
Subsequent Test Depends On

An inaccurate due date is not just a minor inconvenience — it can directly affect screening results, diagnostic decisions, and even the safety of delivery. Here is exactly why CRL-based dating is so critical.

NT Scan Risk Calculation

The NT scan at 11–14 weeks calculates chromosomal risk using the CRL. If the dating is wrong by even one week, the risk calculation changes — a normal NT can appear abnormal, or a high-risk measurement may be missed entirely. Correct dating at 8–10 weeks prevents this.

NIPT Interpretation

Non-invasive prenatal testing (NIPT) blood tests are interpreted in the context of gestational age. Incorrect dates can affect whether the test is appropriate, and how results are interpreted. CRL dating ensures the NIPT is requested at the right time.

Anomaly Scan Timing

The anomaly scan must be performed at 18–22 weeks for the most complete fetal structural assessment. An incorrect date means the scan may be done too early (structures not yet fully formed) or too late (the window is missed). Only accurate dating prevents this.

First Trimester Screening

The combined first trimester screening (NT + blood markers PAPP-A and free beta-hCG) has strict gestational age requirements. The blood test must be taken within a specific window, and the results are meaningless without accurate dating from CRL.

Post-Dates Management

If a pregnancy goes past 40 weeks without labour, the decision to induce depends entirely on the accurate due date. An incorrectly dated pregnancy may lead to induction at what is actually only 39 weeks, or delay necessary intervention beyond 41 weeks.

Irregular Cycles — LMP Unreliable

In women with irregular menstrual cycles — including those with PCOS, recent hormonal contraception, or breastfeeding — the last menstrual period date is highly unreliable. CRL measurement at 8–10 weeks is the only accurate way to establish dates in these cases.

🧬
IVF & ART Pregnancies — Still Need CRL Confirmation

Many IVF patients believe that since the embryo transfer date is precisely known, a dating scan is not needed. However, CRL confirmation is still essential — even in IVF pregnancies. The growth of the embryo after transfer can vary, and a CRL scan confirms that development is on track, checks for the heartbeat, and rules out ectopic pregnancy — a risk that is higher after assisted conception.

Mayflower Fetal Medicine Centre sees many IVF pregnancy patients from across Nagpur and Central India. Dr. Kunda Shahane provides dedicated early pregnancy surveillance for IVF pregnancies, recognising the particular anxiety and care these patients need.

Complete Scan Assessment

What Dr. Kunda Shahane Checks
During Your Dating Scan

A dating scan at Mayflower Clinic is not a quick measurement — it is a thorough early pregnancy assessment covering everything that can be meaningfully evaluated at this stage.

Gestational Sac Location

Confirms the gestational sac is within the uterine cavity — ruling out ectopic pregnancy (fallopian tube, cervical, or abdominal). If the sac cannot be seen inside the uterus, urgent investigation is initiated.

Fetal Heartbeat (Cardiac Activity)

Cardiac activity is detected and confirmed. The fetal heart rate is recorded. A strong, regular heartbeat at 7–10 weeks is highly reassuring about ongoing pregnancy viability.

Crown-Rump Length (CRL)

The most important measurement — taken from the tip of the baby's head to the base of the spine in the optimal position. Multiple measurements are taken and the best is used to calculate gestational age and EDD.

Number of Fetuses

Each gestational sac is identified and each heartbeat confirmed separately. In twin pregnancies, chorionicity is assessed — whether the babies share a placenta (monochorionic) or have separate placentas (dichorionic).

Yolk Sac and Embryo

At 6–8 weeks, the yolk sac is assessed alongside the embryo. An abnormal yolk sac (very large, absent, or irregular) can indicate a pregnancy at higher risk of early pregnancy failure.

Uterus and Ovaries

Basic maternal pelvic assessment — identifying fibroids (their size, location relative to the pregnancy, and potential impact), ovarian cysts, and uterine anatomical variants that may be relevant to the pregnancy's management.

❤️
The Moment You Hear the Heartbeat
For most expectant parents, this is the most profound moment of the early pregnancy — the first time the reality of new life becomes undeniable. Dr. Kunda Shahane takes time to show you the heartbeat clearly on the screen, explain what you are seeing, and answer every question you have. Your dating scan appointment is never rushed.
On the Day

What to Expect — Step by Step

A dating scan at Mayflower Clinic is a relaxed, unhurried appointment. Here is exactly what happens from arrival to the moment you leave with your scan report and photos.

  • 1
    Arrival and registration

    Arrive 5–10 minutes before your appointment time. You will be registered at reception and asked to complete a brief patient information form covering your last menstrual period, cycle regularity, any previous pregnancies, and whether this is an IVF pregnancy.

  • 2
    Brief consultation with Dr. Kunda Shahane

    Before the scan begins, Dr. Kunda will briefly review your history, confirm the reason for the scan, and explain what she will be looking for. She will tell you which approach (transabdominal or transvaginal) will be used and why.

  • 3
    Gel applied and scan begins

    For a transabdominal scan: a small amount of warm gel is applied to the abdomen and the probe is placed gently on the skin. For a transvaginal scan: you will be asked to empty your bladder; the slender probe is gently introduced into the vagina. The screen is positioned so you can see everything Dr. Kunda sees.

  • 4
    Heartbeat and baby visualised

    Dr. Kunda locates the gestational sac, identifies the embryo, and confirms the heartbeat. She will point out what you are seeing on the screen and show you the flickering heartbeat — usually the most memorable moment of the appointment.

  • 5
    CRL measured and EDD calculated

    Several measurements of the Crown-Rump Length are taken to obtain the most accurate figure. The gestational age in weeks and days, and the estimated due date, are calculated and recorded. The uterus, ovaries, and any twins are assessed.

  • 6
    Results explained and report provided

    Dr. Kunda explains all findings clearly — gestational age, EDD, heartbeat, number of babies, and any other observations. A written scan report is provided, along with printed scan images for you to keep. She advises when your next scan should be (typically the NT scan at 11–14 weeks).

✓ What to Bring & How to Prepare

  • ✓Partially full bladder (for transabdominal): Drink 2–3 glasses of water 30 minutes before your appointment. Not too full — comfortably full is ideal for the best image quality.
  • ✓Last menstrual period date: Bring a note of the first day of your last menstrual period (LMP), even if your cycles are irregular. It is used alongside CRL to cross-check dating.
  • ✓Previous scan reports: If you have had an early viability scan elsewhere, bring the report. Any previous obstetric records or reports from this pregnancy are helpful.
  • ✓IVF / fertility treatment details: If this is an IVF pregnancy, bring a note of the embryo transfer date, the embryo age at transfer (day 3 or day 5), and any previous ultrasound results from the fertility clinic.
  • ✓Comfortable clothing: Wear comfortable, two-piece clothing that allows easy access to the abdomen. A top that can be easily lifted and loose-waisted bottoms work best.
  • ✓Bring your partner: Partners and family members are welcome at dating scans. Many families want to share the first sight of the heartbeat together — this is encouraged.
  • ✓ID and referral: A valid ID and your referral letter (if from another doctor or obstetrician).
  • ✓No fasting required: You may eat and drink normally before your dating scan. There is no need to come on an empty stomach.
Watch Dr. Kunda Shahane
Fetal Medicine & Pregnancy Scans — Dr. Kunda Shahane, Mayflower Clinic Nagpur
Frequently Asked Questions

Your Dating Scan Questions, Answered

What exactly is a dating scan and what does it confirm?
A dating scan is an early pregnancy ultrasound performed between 6 and 12 weeks. It confirms seven things: that the pregnancy is inside the uterus (not ectopic), the fetal heartbeat, the gestational age in weeks and days (from Crown-Rump Length), your estimated due date, the number of babies, an early basic anatomy check, and the uterus and ovary assessment. It is also called a viability scan, early pregnancy scan, or CRL scan.
When should I come for my dating scan?
The ideal time is between 8 and 10 weeks of pregnancy, when the Crown-Rump Length (CRL) measurement is most accurate for dating — within ±3–5 days. If you have bleeding, pain, a history of ectopic pregnancy or miscarriage, or an IVF pregnancy, come earlier — a viability scan from 6 weeks will confirm the heartbeat and rule out ectopic pregnancy. Dating is valid by CRL up to approximately 12 weeks, after which the NT scan window begins.
Is a transvaginal scan necessary and is it safe?
Whether a transvaginal scan is needed depends on how far along the pregnancy is. Before 8 weeks, the embryo is very small (2–8 mm) and the transvaginal approach provides a much clearer image. The transvaginal probe is smooth, thin, and specifically designed for this purpose. It is gently placed just inside the vagina — it does not enter the uterus and does not touch the pregnancy in any way. It is completely safe and does not increase the risk of miscarriage. From 8 weeks onwards, most women can be scanned transabdominally.
My period is regular — do I still need a dating scan?
Yes — even with regular periods, the LMP-calculated date assumes a 28-day cycle with ovulation on day 14. In practice, ovulation timing varies, and the LMP date can be off by 1–2 weeks even in women with apparently regular cycles. CRL measurement at 8–10 weeks is simply more accurate. Additionally, a dating scan provides the heartbeat confirmation, twins check, and early pregnancy reassurance that no LMP calculation can offer.
What if no heartbeat is found at the dating scan?
If no heartbeat is found, the most important first question is: how early is the pregnancy? Before 6 weeks, a heartbeat may not yet be detectable even in a completely normal pregnancy. Dr. Kunda Shahane will assess the size of the gestational sac and embryo (CRL, if visible) to determine whether the timing is simply too early — in which case a repeat scan in 1–2 weeks is arranged. If the scan suggests the pregnancy should be further along than the heartbeat implies, Dr. Kunda will explain the findings compassionately and arrange the appropriate next steps.
Can the dating scan detect twins — and what is chorionicity?
Yes — the dating scan is the ideal time to detect twins. Each gestational sac and heartbeat is identified. Importantly, the early weeks (ideally before 10–12 weeks) are the best time to determine chorionicity — whether the twins share a placenta (monochorionic) or have separate placentas (dichorionic). Monochorionic twins share a blood supply and are at risk of Twin-to-Twin Transfusion Syndrome (TTTS), requiring much more intensive monitoring. This distinction is most reliably made in the first trimester — another compelling reason not to delay the early scan.
What comes after the dating scan?
After the dating scan, Dr. Kunda Shahane will advise on your next appointment — typically the NT scan and first trimester combined screening at 11–14 weeks. If the dating scan identifies any concerns (an ovarian cyst, an unusual uterine finding, or a twin pregnancy requiring closer surveillance), she will advise a follow-up schedule accordingly. You will leave with a written report, your estimated due date, and printed scan images.

Your Next Scans at Mayflower Clinic

NT Scan (11–14 Weeks) → Anomaly Scan (18–22 Weeks) → NIPT / Prenatal Screening → Fetal Echo → All Pregnancy Scans → About Dr. Kunda Shahane →

Ready to See Your Baby's First Heartbeat?

Book your dating scan at Mayflower Fetal Medicine Centre — and start your pregnancy on the most accurate foundation possible. Dr. Kunda Shahane and her team are ready to welcome you for this special appointment.

📞 Call 0712-669-2706 💬 WhatsApp Us 📅 Book Dating Scan

Mayflower Fetal Medicine Centre · Dhantoli, Nagpur 440012 · Monday–Saturday 10:00 AM – 6:00 PM

⚖️ PCPNDT Act Compliance Notice Mayflower Fetal Medicine Centre strictly complies with the Pre-Conception and Pre-Natal Diagnostic Techniques (Prohibition of Sex Selection) Act, 1994. Sex determination and sex-selective practices are strictly prohibited and punishable by law. All ultrasound services at this centre are performed exclusively for medical diagnosis and fetal wellbeing. Disclosure of fetal sex is illegal and is not performed at this centre.
Medical Disclaimer: This content is for general information only and does not constitute medical advice. Please consult Dr. Kunda Shahane or your treating obstetrician for advice specific to your pregnancy.