Comparison of the efficacy of immediate versus delayed frozen-thawed embryo transfer on the ongoing pregnancy rate after a failed IVF attempt: a randomised controlled trial

Status

Active, not recruiting

Phases

Early Phase 1

Study type

Interventional

Source

ChiCTR

Registry ID

ChiCTR2000033313

Enrollment

Unknown

Registered

2020-05-27

Start date

2020-09-01

Completion date

Unknown

Last updated

2020-06-01

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Infertility

Interventions

Immediate group:Immediate FET in the first cycle following the fresh-failed cycle

Delayed group:Postpone FET for at least one menstrual cycle following the fresh-failed cycle

Eligibility

Sex/Gender

Female

Age

21 Years to 44 Years

Inclusion criteria

Inclusion criteria: 1. Patients aged 21-44 will be recruited in this study; 2. Patients with at least one frozen embryo; 3. Subjects who received the standard ovarian stimulation program and the first FET after the failure of IVF fresh embryo transfer.

Exclusion criteria

Exclusion criteria: 1. Patients with ovarian hyperstimulation syndrome; 2. Objects with BMI >= 30kg / m2; 3. The objects with abnormal chromosome karyotypes; 4. Patients with severe endometriosis; 5. Patients with untreated hydrosalpinx before FET; 6. Patients with congenital or acquired abnormal uterine development and other contraindications of assisted reproductive technology.

Design outcomes

Primary

Measure	Time frame
Ongoing pregnancy rate;	—

Secondary

Measure	Time frame
Pregnancy loss rate;	—

Countries

China

Contacts

Public ContactZhengao Sun

Shandong University of Traditional Chinese Medicine

sunzhengao77@126.com+86 13708938621

Outcome results

None listed

Source: ChiCTR (via WHO ICTRP) · Data processed: Feb 21, 2026