Chapter 14

Question 1

The A450 of amniotic fluid is plotted in zone 3 of a Liley graph. The physician
should:

Answer 1

request testing for fetal lung maturity

Question 2

Lamellar bodies contain:

Answer 2

phospholipids

Question 3

Analysis of amniotic fluid bilirubin levels is performed using

Answer 3

spectrophotometry

Question 4

A dark yellow amniotic fluid is caused by:

Answer 4

bilirubin

Question 5

Alpha-fetoprotein is produced by the fetal:

Answer 5

liver

Question 6

An amniotic fluid optical density at 650 nm of 0.180 correlates with:

Answer 6

a lamellar body count over 32,000/L

Question 7

A second amniocentesis is performed on a diabetic woman believed to be at
approximately 35 weeks gestation. She is pregnant with her second child, and the
bilirubin A450 on the first amniocentesis was in zone 2 of the Liley graph. If the
bilirubin A450 is now in zone 3, what additional testing should be performed?

Answer 7

Fluorescence polarization assay

Question 8

An amniocentesis is performed on a woman believed to be at approximately 15
weeks gestation. A possible abnormality has been observed on her sonogram, and
her serum alpha-fetoprotein is elevated. What additional test could be performed if
the alpha-fetoprotein is elevated?

Answer 8

Acetylcholinesterase

Question 9

To differentiate between maternal and fetal blood in blood-streaked amniotic fluid, the
fluid is tested for:

Answer 9

fetal hemoglobin

Question 10

A technical error that could produce a falsely low fetal lung maturity test is:

Answer 10

centrifuging the specimen at too high a speed