Ultrasound examination
Amniotic fluid index, AFI ≥ 25cm ✓ AFI 25-35cm, as mild polyhydramnios ✓ AFI 36-45cm, as moderate polyhydramnios ✓ AFI ≥ 46cm, as severe polyhydramnios
Oligohydramnios
Third trimester amniotic fluid volume less than 300ml is known as oligohydramnios
Abnormal cord insertion
Marginal cord insertion into placenta, known as racket placenta
Cord insertion onto membrane, runs between chorionic membrane and amniotic membrane before inserting into placenta, known as cord velamentous insertion
Cord prolapse is life-threatening to the fetus
Cord presentation
Cord prolapse
Knot of cord
Cord entanglement
Cord entanglement
Abnormal Liquor Volume
the symptoms are usually milder, known as chronic polyhydramnios If over days, can causse severe compression symptoms, known as acute polyhydramnios Fetal structural deformity: ( neural tube defect, NTD)