ATI LPN
Lewis's Medical Surgical Nursing in Canada, 5th Edition
Chapter 15 Questions
Question 1 of 5
When carrying out pre-symptomatic testing, which of the following diseases has a gene that is 100% penetrant?
Correct Answer: D
Rationale: In pre-symptomatic testing, an individual has genetic testing to determine whether she or he carries a genetic mutation for a genetic disorder. Typically, individuals electing this testing are members of a family that exhibits a genetic disorder. An example of this would be genetic testing for Huntington's disease, an adult-onset condition characterized by progressive neurological degeneration. The gene responsible for Huntington's disease is 100% penetrant, that is, everyone who inherits this mutation will exhibit the disease and, since there is no cure, will die of the disease.
Question 2 of 5
A newly pregnant woman asks the nurse what the best time is for chorionic villus sampling? Which of the following time frames is the basis for the nurse's response?
Correct Answer: B
Rationale: Chorionic villus sampling (CVS) is done in the first trimester, usually between 11 and 12 weeks gestation.
Question 3 of 5
The parents of a child with brachydactyly ask if their next child will also be affected. Which of the following is the basis for the nurses' response related to autosomal dominant disorders?
Correct Answer: C
Rationale: Brachydactyly is an autosomal dominant disorder, meaning that there is a 50% chance that offspring will be affected. It happens equally in males and females.
Question 4 of 5
A newly pregnant woman asks the nurse what the best time is for a prenatal diagnostic amniocentesis? Which of the following time frames is the basis for the nurses' response?
Correct Answer: C
Rationale: A prenatal diagnostic ultrasound should be done between 15 and 17 weeks of gestation during which amniocentesis can be performed.
Question 5 of 5
When taking a family history in the genetic clinic, the nurse will ask information about how many generations in the past?
Correct Answer: B
Rationale: A detailed three-generation family history, or pedigree, offers great insight into possible genetic conditions within a family.