Related Experiment Video
Updated: Jan 31, 2026

Pregnancy and Nursing Management for Embryo-Transferred and Genetically Modified Rabbits
Published on: December 13, 2024
Twin pregnancies and perinatal outcomes: a comparison between fresh and frozen embryo transfer: a two-centre study
Maya Shavit1, Netanella Miller2, Hanoch Schreiber1
1The Department of Obstetrics and Gynecology, Meir Medical Centre, Kfar-Saba, Israel.
Research Question:
To assess the perinatal and obstetric outcomes of twin pregnancies resulting from IVF frozen embryo transfer (FET) in comparison with fresh embryo transfer.
Design:
A retrospective cohort study of 773 twin pregnancies conceived via IVF treatment. Data were collected from the records of two outpatient fertility IVF clinics of cycles conducted between 2006 and 2016.
Results:
A total of 773 pregnancies were evaluated: 614 (79.4%) following FET and 159 (20.6%) following fresh embryo transfer. The FET group had a significantly higher mean birthweight (P = 0.002), and lower rates of small for gestational age (P = 0.003), low (P = 0.003) and very low birthweight (P = 0.006) infants. Also, a significantly lower rate of spontaneous second trimester miscarriage compared with the fresh embryo transfer group was observed (P = 0.001). No significant difference was found between groups regarding gestational age at delivery, term birth (after 37 weeks of gestation), twin discordancy rate, fetal major malformation rate, and hospitalization duration.
Conclusion:
In twin pregnancies, FET might have better perinatal outcomes compared with fresh embryo transfer in regards to birthweight and spontaneous second trimester miscarriages. Further research is needed to evaluate these results.
Related Concept Videos
The Sense of Self: Reflected Self-Appraisal and Social Comparison
Predicting Reaction Outcomes
Outcomes of Glycolysis
Cellular respiration can occur aerobically (with oxygen) or anaerobically (without oxygen). In the presence of oxygen, cellular respiration starts with glycolysis and continues with pyruvate...
Segregation in Fresh Concrete
Bleeding in Fresh Concrete
Bleeding can cause several issues in the concrete structure. Sometimes, the rising water gets trapped beneath large aggregate...
Guidelines for Writing Outcome
Patient outcomes reflect the patient's response to the goal rather than what the nurse aims to achieve. Terminology should be observable and measurable to avoid the reader's interpretation. The desired outcome should be realistic and achievable in the designated care timeframe. Expected outcomes should align with adjunctive therapies. The outcome should enhance care...

