While working with the pregnant client in her first trimester, what information does the nurse provide regarding when chorionic villus sampling (CVS) can be performed (in weeks of gestation)?
10 weeks
18 weeks
6 weeks
4 weeks
The Correct Answer is A
A. Chorionic villus sampling (CVS) is typically performed between 10 and 13 weeks of gestation. It involves obtaining a small sample of placental tissue (chorionic villi) to test for chromosomal abnormalities, genetic disorders, and certain metabolic conditions. Performing the procedure within this timeframe allows for early detection of fetal abnormalities, which gives the parents more options for pregnancy management.
B. By 18 weeks of gestation, CVS is no longer indicated, as amniocentesis becomes the preferred procedure for prenatal genetic testing at mid-pregnancy. Performing CVS this late would increase the risk of complications without providing additional benefit.
C. At 6 weeks, the placenta is not sufficiently developed to obtain an adequate sample of chorionic villi. Attempting CVS this early carries a higher risk of procedure failure and complications, including miscarriage.
D. At 4 weeks, the embryo is too small and placental development is insufficient for CVS. Genetic testing is not feasible at this stage, and attempting it would be unsafe.
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Related Questions
Correct Answer is B
Explanation
A. December 7, 2025: This date is over a year late, likely due to miscalculation in applying Naegele’s Rule.
B. To calculate the expected date of birth (EDB), use Naegele’s Rule, which estimates a 40-week gestation from the first day of the last menstrual period:
- Start with the LMP: March 14, 2024
- Add 1 year: March 14, 2025
- Subtract 3 months: December 14, 2024
- Add 7 days: December 21, 2024
This calculation assumes a 28-day menstrual cycle and provides a standard method for estimating the due date.
C. December 17, 2024: This is four days early, possibly due to an arithmetic error in adding 7 days.
D. November 17, 2024: This is too early, likely due to subtracting months incorrectly or misinterpreting the rule.
Correct Answer is D
Explanation
A. Drying the newborn thoroughly and removing wet linens helps prevent evaporative heat loss, not conductive heat loss. While important for thermoregulation, this action does not directly address conduction, which occurs when the newborn comes into direct contact with a cooler surface.
B. Placing the newborn under a radiant warmer prevents heat loss through radiation, as the newborn absorbs heat from a warmer source without direct contact. This does not prevent conductive heat loss caused by touching cold surfaces.
C. Placing the newborn directly on the scale exposes the infant to cold, hard surfaces, which increases heat loss via conduction. This action would actually exacerbate conductive heat loss rather than prevent it.
D. Placing the newborn on a prewarmed blanket over the scale is the most effective way to prevent heat loss via conduction. Conduction occurs when heat is transferred from the newborn’s body to a cooler surface in direct contact. Using a prewarmed blanket provides insulation and prevents heat from transferring away from the infant, maintaining body temperature during initial assessments and procedures.
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