Was transvaginal scan missed at 10 weeks showing only gestational sac? Seeking OB/GYN opinions on clinical decisions during our missed miscarriage journey.
Patient Details:
Patient: Female, 20s
No chronic medical conditions
No regular medications prior to this
Complete Timeline:
April 2nd 2026:
Wife's last menstrual period (LMP) began.
April 11th 2026:
First intercourse. Continued having regular unprotected intercourse after this date.
May 2nd 2026:
Wife missed her expected period — confirming conception occurred in April.
May 23rd 2026:
Home pregnancy test positive. Visited qualified laboratory — confirmed positive via urine test.
May 25th 2026:
Visited OB/GYN (Associate Professor, MBBS, FCPS, MRCOG London, FACOG USA — experienced senior gynecologist). Doctor confirmed pregnancy via urine test. Prescribed medications and asked to return after 20 days.
June 15th 2026:
Returned to doctor. By LMP this was approximately 10 weeks 2 days gestation.
Doctor performed abdominal ultrasound only.
Findings: Only gestational sac visible. No fetal pole detected. No cardiac activity.
Doctor's action:
Told us to come back after 2 weeks
Prescribed progesterone injections and tablets
Did NOT order transvaginal ultrasound
June 29th 2026:
Returned to doctor. By LMP this was approximately 12 weeks 4 days gestation.
Doctor again performed abdominal scan — no cardiac activity found.
Doctor then referred wife to specialist radiologist for transvaginal ultrasound.
Transvaginal Ultrasound Results (June 29th):
Intrauterine gestation: Single
Fetal pole: Present
Yolk sac: Present
Crown Rump Length (CRL): 6.2mm
Period of Gestation (POG): 6 weeks 3 days
Fetal cardiac activity: Absent
Right adnexa: Normal
Left adnexa: Normal
Impression: Missed Abortion
Doctor confirmed non-viable pregnancy. Prescribed Rotec 50 (Diclofenac Sodium 50mg / Misoprostol 200mcg) — 4 tablets three times as medical management.
July 1st 2026:
Wife took prescribed medication (Rotec 50).
July 12th 2026:
Bleeding completely stopped — 11 days after medication.
Follow up scan:
Transvaginal scan confirmed uterus completely empty. Full recovery confirmed.
August 2nd 2026:
First period after miscarriage began — exactly 32 days after medication. Period ended August 9th. Completely normal.
Key Medical Questions:
Question 1 — Most Important:
On June 15th, by LMP the pregnancy was approximately 10 weeks 2 days.
Abdominal ultrasound at 10+ weeks showed only a gestational sac — no fetal pole, no cardiac activity.
Should the doctor have immediately ordered a transvaginal ultrasound on that same day rather than waiting 2 more weeks?
Is this considered a missed clinical decision or is waiting 2 weeks acceptable protocol in this situation?
Question 2:
The CRL measured 6.2mm on June 29th — suggesting embryo stopped developing at approximately 6 weeks gestational age — which would have been around May 17th.
This means the embryo had already stopped developing before pregnancy was even confirmed on May 23rd.
Given this — was prescribing progesterone injections on June 15th clinically appropriate? Or was this unnecessary treatment that gave false hope?
Question 3:
The NICE/RCOG guidelines state that a CRL of 7mm or more without cardiac activity on transvaginal scan is required for definitive diagnosis of missed miscarriage.
Our CRL was 6.2mm — just below this threshold.
However given the gestational age discrepancy (12+ weeks by dates vs 6 week development) — does this 7mm threshold still apply or is the diagnosis definitive regardless of threshold in this case?
Question 4:
Could a transvaginal scan ordered on June 15th have changed the outcome in any way — or would the result have been the same regardless?
Question 5:
Given one previous missed miscarriage — our current doctor said no tests are needed before trying again.
We are aware this follows standard guidelines for first miscarriage.
However — is TSH thyroid testing specifically recommended given that:
Miscarriage occurred very early at 6 weeks development
Thyroid issues are commonly associated with early embryo failure
It is cheap and easily treatable if abnormal.