1. The incidence of preterm birth is:

a. 6%

b. 8%

c. 10%

d. 12%

2. All the following statements about cervical length are true, except:

a. The translabial measurement of cervical length is not as successful as the transvaginal approach

b. Cervical length is inversely related to the risk of preterm labor

c. The manual assessment of cervical length is as reliable as transvaginal sonography

d. A dynamically changing cervix has been associated with uterine contractions

3. All of the following statements about cervical length are true, except:

a. In term women in labor the cervix shortens by 50% during a contraction

b. The cervix should always be measured as a straight line

c. In order to assess the cervix for dynamic changes in length, a 10-minute observation is required

d. The shortest of 3 measurements should be recorded for cervical length

4. All of the following statements about cervical length are correct, except:

a. Focal contractions may obscure the internal cervical os and result in a longer measurement

b. Cervical length is considered a continuous variable

c. The mean cervical length is 50 mm

d. A cervical length of 25 mm is at the 10th percentile

5. All of the following statements about cervical length are correct, except:

a. Most patients who deliver preterm have a cervical length < 25 mm by 12 weeks' gestation

b. The cervix cannot be accurately measured at 10 weeks' gestation

c. The bladder reflection is the boundary between the lower uterine segment and cervix

d. There is a gradual progressive shortening of cervical length after 30 weeks' gestation

6. All of the following statements about fetal fibronectin are correct, except:

a. Fibronectin is present in amniotic membranes and decidua

b. Cervical fibronectin and cervical length may identify different patients at risk for preterm labor

c. Fetal fibronectin is most accurate in predicting preterm labor within 7-10 days among women with symptoms of preterm labor

d. Fibronectin has a greater accuracy in predicting preterm labor in asymptomatic in contrast to symptomatic pregnant women

7.  The following statements about cervical length and preterm labor are correct, except:

a. 50% of low-risk women with a short cervix deliver early

b. 75% of a high-risk population with a short cervix deliver prematurely

c. Prior preterm deliveries increases the risk of a subsequent preterm delivery

d. The positive predictive value of a short cervix is higher if an abnormally shortened cervix is detected at 14-18 weeks in contrast to 18-22 weeks

8. The following statements about cervical length and preterm labor are true, except:

a. Chorioamniotic membrane separation is an independent risk factor for preterm labor

b. Minimal cervical canal dilatation has been associated with an increased risk of preterm labor

c. Patients with a cervical length < 15 mm have a higher rate of positive amniotic fluid cultures than patients with a cervical length > 15 mm

d. Cervical length <= 30 mm in twin pregnancies at 27 weeks' gestation predicts delivery before 34 weeks

9. The measurement of cervical length with 3D sonography is shorter than with the 2D approach

a. True

b. False

10. The lengthening of the cervix after a cerclage is associated with a higher likelihood of a term delivery

a. True

b. False