A Level 2 anomaly scan (mid‑trimester anatomy scan) is a detailed ultrasound, usually performed at 18–22 weeks, that examines fetal anatomy and development. It assesses organs (brain, heart, spine, kidneys, limbs), measurements, placenta position, umbilical cord and amniotic fluid to detect structural abnormalities. It's noninvasive and done by a trained sonographer; abnormal findings may prompt further tests or specialist referral.

A fetal anomaly is a structural or functional abnormality in the developing baby detected before birth or at delivery. It includes congenital malformations (e.g., heart defects, neural tube defects), chromosomal or genetic conditions, growth abnormalities, and functional disorders. Severity ranges from minor to life‑threatening. Anomalies are identified by screening, ultrasound, and diagnostic tests and may require specialist assessment, monitoring, or intervention.

A normal anomaly-scan report states that the fetal anatomy appears normal with no major structural abnormalities detected; heart with normal rate and four-chamber view; brain, spine, face, limbs, kidneys and bladder visualised; growth measurements and estimated gestational age are appropriate; amniotic fluid volume and placenta location are normal; umbilical cord has three vessels and fetal movements are present.

Yes. A Level 2 (detailed anatomy) ultrasound is ideally done around 18–22 weeks but can still be performed at 24 weeks. It’s generally feasible, though some structures may be harder to visualize because of fetal size or position. If views are limited, a repeat scan or specialist fetal imaging referral may be recommended—discuss timing and expectations with your obstetrician.

I’m not sure which “rule of 3” you mean. Do you mean the recommended timing (around 18–22 weeks), the three core checks during an anomaly scan (major structural organs, fetal growth measurements, placenta/amniotic fluid), or a different rule? Tell me which and I’ll provide a 50–75 word explanation.

Most 20‑week (anomaly) scans show no major problems. Major structural abnormalities are uncommon, occurring in roughly 2–4% of pregnancies; minor or unclear findings that need follow‑up are more frequent. Risk varies with maternal age, history and scan quality. If something is suspected, you’ll be offered more detailed ultrasound, specialist review and possible genetic testing to clarify the diagnosis and options.