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Amnionic Fluid

Which of the following is correct regarding contribution to amnionic fluid volume in the second and third trimesters?

a. Highest production is from fetal urination

b. Highest resorption is into fetal respiratory tract

c. Least resorption is across fetal vessels on placental surface

d. All of the above are correct

What is the normal amnionic fluid volume at term?

a. 300–500 mL

b. 750–800 mL

c. 1200–1500 mL

d. 1800–2000 mL

Which of the following is not a significant source for fluid in the amnionic cavity in the first trimester?

a. Fetal skin

b. Fetal urine

c. Flow across amnion

d. Flow across fetal vessels

Which of the following is not true regarding osmolality of fetal urine?

a. Fetal urine is isotonic to amnionic fluid.

b. Fetal urine is hypertonic to fetal plasma.

c. Fetal urine is hypotonic to maternal plasma.

d. All of the above are true

In a healthy pregnancy at term, which of the following is the best estimation of daily fetal urine volume?

a. 250 mL

b. 500 mL

c. 750 mL

d. 1000 mL

Which of the following is not an acceptable way to document amnionic fluid when reporting ultrasound findings?

a. Amnionic fluid index of 12.2 cm

b. Deepest vertical pocket of 4.1 cm

c. Maximal vertical pocket of 5.2 cm

d. Subjectively normal amnionic fluid volume

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