Gynaecology & Obstetrics Abnormal baseline variability in fetus is defined as: A Beat to beat variation < 5 mins B Beat to beat variation < 5 for 40 mins C Beat to beat variation < 5 for 60 mins D Beat to beat variation < 5 for 90 mins 💡 Explanation Abnormal baseline variability in fetus is defined as: ✓ Correct Answer: D. Beat to beat variation < 5 for 90 mins