Fetal environment registry review

Question 1

Amniotic fluid index (AFI)

Answer 1

Dividing uterus into 4 quadrants and measuring the largest pocket of fluid in each quadrant (exclude fetal parts/cord) and add together
-Progressively increases until 28 weeks then slows

Question 2

Normal AFI range

Answer 2

5-24cm

Question 3

Deepest vertical pocket (DVP)

Answer 3

Maximum vertical pocket excluding fetal parts and cord

Question 4

Oligohydramnios

Answer 4

AFI <5cm / DVP <2cm
Associated with: demise, renal, IUGR, PROM, post dates

Question 5

Polyhydramnios

Answer 5

AFI >24cm / DVP >8cm
Associated with: GI atresia, skeletal, open defects, hydrops, cystic hygroma

Question 6

Biophysical profile

Answer 6

Total possible 8/8
-Fetal breathing: 30 secs (2)
-Gross fetal movement: 3 movements (2)
-Fetal tone: 1 limb/hand felxion or extension (2)
-Amniotic fluid: 1 pocket measuring 2cm x1cm (2)
*NO movement = loss points for movement and tone

Question 7

Lung maturity

Answer 7

2nd to 3rd trimester = MOST accurate measure by amniocentisis for L/S ratio (lecithin/sphingomyelin)

Question 8

Sonographic evidence of lung maturity

Answer 8

Lung increasingly echogenic compared to liver in 3rd trimester