Antenatal USG Examination: Correct Statements

Statement Analysis

The question asks to identify the correct statements regarding antenatal Ultrasound (USG) examinations.

• Statement 1: Detecting gross fetal anomalies - Antenatal USG is a crucial tool for identifying major structural abnormalities in the fetus. This statement is correct.
• Statement 2: Identifying multiple pregnancies - Ultrasound is the standard method for diagnosing the presence of twins, triplets, or other multiple gestations. This statement is correct.
• Statement 3: Identifying viable pregnancy - Early antenatal scans can confirm the presence of a gestational sac, yolk sac, and fetal heartbeat, thus establishing pregnancy viability. This statement is correct.
• Statement 4: Best dating with third trimester scan - Fetal age estimation (dating) is most accurate during the first trimester, typically between 8 and 12 weeks. Third-trimester ultrasounds are less accurate for dating due to variations in fetal growth rates. This statement is incorrect.

Conclusion

Statements 1, 2, and 3 accurately describe the utility of antenatal USG examinations.

Statement 4 is incorrect because the first trimester provides the best accuracy for dating pregnancies via ultrasound.

Therefore, the correct combination includes statements 1, 2, and 3 only.