20-week scan
Examination, preparation, results and limitations.
Open informationWeeks 14–27
Second trimester: anatomy, growth and maternal health
Follow-up continues even when the mother feels well. This is the time of the anomaly scan and several metabolic and laboratory checks.
- Obstetric consultation
- Advanced ultrasound
- Laboratory and screening
- Late-pregnancy monitoring
- Nutrition
Complementary follow-upAskabide + Osakidetza · birth at the reference hospital
The anomaly scan
Around 20 weeks a systematic assessment is made of fetal anatomy, biometry, placenta, amniotic fluid and other parameters. Imaging conditions and gestational age influence what can be assessed.
Blood tests and gestational diabetes
The O’Sullivan test is used for screening. An altered result is not automatically a diagnosis and may require an oral glucose tolerance test or another assessment under the applicable protocol.
Glucose screening
What happens before, during and after the test.
Open information
Pregnancy blood tests
Full blood count, urine and case-specific tests.
Open informationWhat we continue to monitor
- Blood pressure and maternal symptoms.
- Fetal growth and wellbeing as indicated.
- Placenta, fluid and cervix where relevant.
- Fetal movements as they become perceptible.
- Weight, diet, iron and digestive symptoms.
Individual nutritional care
Dr Odriozola can support diet planning, weight progress, reflux, constipation, anaemia or gestational diabetes within a coordinated plan.
Nutrition in pregnancy
Diet consultation and postpartum continuity.
Open informationClinical sources
General information only. It does not replace an individual medical assessment or recommendation.
Reviewed 19 August 2026