Fetal And Placental Tissues Flashcards
Amniotic fluid volume at 10 weeks
30 ml
AF volume at 12 weeks
50 ml
Amniotic fluid volume at 16 weeks
190 ml
Amniotic fluid volume at 35 weeks
900 ml
When does the amniotic fluid started to be decreased
> 35 weeks volume of amniotic fluid decreases
Osmolality of the amniotic fluid is
275 mosm/l
Fluid exchange in the amniotic fluid
500 ml /day
Acidity of the amniotic fluid
Ph = acidic
PO2 of the amniotic fluid
2-15 mmhg
Amniotic fluid PCO2
50 -60. Mmhg
Formation and clearance of the amniotic fluid in the 1st trimester depends on
Placenta
Fluid exchange occur through the transparent skin .
Fetal skin keratenizes at which week of gestational age
At 22-25 weeks GA .
Formation an clearance of amniotic fluid in the 2nd trimester depends on 4 things
Fetal swallowing
Fetal urine
Fetal lung secretion
Intamembranous placental
Amount of lung secretions in the fetus / day
200-400 ml/day .
Urine first enters the amniotic fluid at which week ga
At week 8-11 GA .
Amount of urine produce at 25 weeks
110ml/kg/day
Amount of urine produced at term
700-900ml /day
When does the full development of renal system complete
Several months after birth
Fetal swallowing start at which week
Fetal swallowing start at 12 weeks Ga
Amount of fetal swallowing / day
250ml/day
Amniotic fluid composition
1 alpha fetoprotein
2 bilirubin
No fin=bronegen in the AF
Where is the highest levels of alpha fetoprotein
Af or fetal blood’
Levels of Alpha fetoprotein are lower in the AF than in the fetal blood
Peak of amniotic fluid in the fetus of the alpha fetoprotein
10-12 weeks
Bilirubin levels in the amniotic fluid start to decreas at which pregnancy period
It starts to decrease in the 3rd trimester .
