A. Fetal Scans | | | | |
1. Viability Scan | Less than 11 weeks | Indicated in most high-risk situations
To ascertain location, number and viability of the embryo | 15min | 60 min |
2. First Trimester Screening | 11 weeks – 13 weeks 6 days (Crown rump length 45 – 84 mm) | This is a major fetal examination: a detailed structural examination and measurement of nuchal translucency | 40 min; delay if fetal position is unfavorable | 90 min |
3. Early Pregnancy Anomaly Scan (EPAS) | 16 – 18 weeks | Detailed evaluation of the fetal structures: Usually indicated in high risk situations or when FTS was missed | 40 min | 90 min |
4. Systematic detailed Target Scan | 19 – 23 weeks | Fetal Size, Fetal Activity, Fetal Anatomy, Fetal Environment, and Cervical Assessment | 40-50 min; delay if suboptimal position or poor penetration of ultrasound waves | 90 min if no abnormalities detected |
5. Fetal Echocardiography | 16 – 24 weeks | Detailed segmental study of the fetal heart: | Done along with EPAS or Target Scan, additional 15 min | Along with the main scan |
6. Growth Surveillance | Decided by the clinical circumstance | Fetal wellbeing assessment: Liquor, activity, Size, blood flow assessment | 25 min depending on fetal condition | 90 min |
7. Prenatal Surveillance of Twins (Monochorionic and Dichorionic protocols) | For monochorionic, starting at 16 weeks – every 2 weeks
For Dichorionic, starting at 20 weeks – every 4 weeks | Twins have unique set of challenges and need a different level of surveillance | 60 min | 90 min |