Recommendations for research
The guideline committee has made the following recommendations for research.
As part of the 2019 update, the guideline committee made an additional research recommendation on the identification on twin anaemia polycythaemia sequence (TAPS). The committee removed 6 of the 2011 recommendations on screening for chromosomal conditions, screening for feto-fetal transfusion syndrome, defining fetal growth restriction, predicting and preventing spontaneous preterm birth, and perinatal and neonatal morbidity and mortality in babies born by elective birth.
What is the most accurate prenatal screening marker for TAPS, including middle cerebral artery peak systolic velocity (MCA‑PSV)? 
For a short explanation of why the committee made the recommendation for research, see the rationale on diagnostic monitoring for twin anaemia polycythaemia sequence.
Does additional information and emotional support improve outcomes in twin and triplet pregnancies? 
Does specialist antenatal care for women with twin and triplet pregnancies improve outcomes for women and their babies? 
What is the most accurate method of determining chorionicity in twin and triplet pregnancies at different gestational ages, and how does operator experience affect the accuracy of different methods? 
Is dietary supplementation with vitamins or minerals, or dietary manipulation in terms of calorie intake, effective in twin and triplet pregnancies? 
Is dietary advice specific to twin and triplet pregnancies effective in improving maternal and fetal health and wellbeing? 
When and how should screening for structural abnormalities be conducted in twin and triplet pregnancies? 
Which clinical factors, laboratory screening tests, and ultrasound tests are predictive of hypertensive disorders in twin and triplet pregnancies? 
What is the clinical and cost effectiveness, and safety, of routine antenatal administration of a single course of corticosteroids for women with twin and triplet pregnancies who are not in labour and in whom labour and birth are not imminent?