The measurement of lecithin in relation to sphingomyelin (L/S ...

[lunatika]

The measurement of lecithin in relation to sphingomyelin (L/S ratio) is used to determine fetal lung maturity. Identify which ratio below is considered to be mature.
 
  1. 4:1
  2. 1.8:1
  3. 2:1
  4. 1:1

Question 2

A maternal serum alpha-fetoprotein test indicates an elevated level. It is repeated and again is reported as higher than normal. What is the next step in the assessment sequence to determine the well-being of the fetus?
 
  1. Percutaneous umbilical blood sampling
  2. Ultrasound for fetal anomalies
  3. Biophysical profile for fetal well-being
  4. Amniocentesis for genetic anomalies

[bigsis44]

Answer to Question 1

3
1. Incorrect. This level indicates immaturity of fetal lungs.
2. Incorrect. This level indicates immaturity of fetal lungs.
3. Correct. This indicates a 2:1 ratio of lecithin to sphingomyelin and lung maturity.
4. Incorrect. This level indicates immaturity of fetal lungs.

Answer to Question 2

2
1. Incorrect. Indications for use of PUBS include prenatal diagnosis of inherited blood dis-orders, karyotyping of malformed fetuses, detection of fetal infection, determination of the acid-base status of fetuses with IUGR, and assessment and treatment of isoimmunization and thrombocytopenia in the fetus.
2. Correct. If AFP findings are abnormal, follow-up procedures include genetic counseling for families with a history of NTD, repeated AFP, ultrasound examination, and possibly, am-niocentesis.
3. Incorrect. A BPP is a method to assess fetal well-being in the third trimester.
4. Incorrect. Prior to the possibility of an amniocentesis being performed, the patient would first have an ultrasound for direct visualization of the fetus.