Many expectant mothers worry when extra scans are ordered: is there a limit? The reassuring answer: there is no established maximum number of medically indicated ultrasounds in pregnancy, and no evidence that repeat diagnostic scans harm babies.
How Many Scans Are "Normal"?
A typical low-risk pregnancy involves two to three scans:
- Dating/viability scan (around 8–13 weeks) — confirms the pregnancy, checks the heartbeat, establishes your due date
- Anomaly scan (around 18–22 weeks) — a detailed check of your baby's anatomy
- Sometimes a third-trimester growth scan, depending on local protocols
Why Some Pregnancies Need More
Additional scans are routinely ordered — and completely appropriate — for:
- Twins or higher multiples
- Diabetes or high blood pressure in pregnancy
- Concerns about baby's growth (too small or too large)
- Low-lying placenta needing recheck
- Reduced fetal movements
- Bleeding or pain at any stage
Some higher-risk pregnancies are scanned every two to four weeks in the third trimester. This is standard, evidence-based care.
The Principle That Protects You
Every scan should have a purpose, performed by a trained professional, using the lowest settings needed (the ALARA principle). Within that framework, the number of scans is driven by your medical needs — not by an arbitrary cap.
Key takeaway: If your doctor recommends another scan, the benefit of the information it provides is the reason — have it with confidence.
This article is for general information only and is not a substitute for professional medical advice.
Ready to Book Your Ultrasound Scan?
Mascot Healthcare Clinic, Akoka (Yaba), Lagos offers ultrasound scans by appointment only, Monday–Saturday, 9am–5pm. Book online and choose a time that works for you.