The second trimester targeted scan is done between 18 and 20 weeks. The primary objective of this scan is to do a detailed anatomical evaluation of the fetus and to maximize the detection of anomalies that may be present at this stage. A systematic method of ultrasound scanning of the fetus will ensure that a reasonably complete examination of the fetus is accomplished. A “rule of three” approach helps in ensuring that no major structures are missed out during the scan. It is a simple “checklist” approach which can be easily remembered. It not only helps in standardized training and performance but also helps in a systematic audit when anomalies are missed.
Keywords
Second trimester - Targeted scan - Rule of three - Checklist - Anomalies
