While talking with a pregnant woman who has undergone genetic testing, the woman informs the nurse that her baby will be born with Down syndrome. The nurse understands that Down syndrome is an example of:
Trisomy numeric abnormality
Multifactorial inheritance
X-linked recessive inheritance
Chromosomal deletion
The Correct Answer is A
Choice A Reason: Trisomy numeric abnormality. Down syndrome is a genetic disorder that occurs when a person has three copies of chromosome 21 instead of two. This extra chromosome causes various physical and mental features that vary from person to person. Down syndrome is also called trisomy 21 because it involves three copies of chromosome 21.
Choice B Reason: Multifactorial inheritance is incorrect because it refers to a type of genetic disorder that results from the interaction of multiple genes and environmental factors. Examples of multifactorial disorders include cleft lip or palate, neural tube defects, diabetes, hypertension, and some types of cancer.
Choice C Reason: X-linked recessive inheritance is incorrect because it refers to a type of genetic disorder that affects males more than females because it is caused by a mutation on the X chromosome. Females have two X chromosomes, so they can be carriers or affected depending on whether they inherit one or two copies of the mutated gene. Males have one X chromosome and one Y chromosome, so they are always affected if they inherit the mutated gene from their mother. Examples of X-linked recessive disorders include hemophilia, color blindness, and Duchenne muscular dystrophy.
Choice D Reason: Chromosomal deletion is incorrect because it refers to a type of genetic disorder that occurs when a part of a chromosome is missing or deleted. This can cause various physical and mental problems depending on the size and location of the deletion. Examples of chromosomal deletion
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A Reason: This is incorrect because hemoconcentration by hypertension is a condition where the blood volume decreases and the blood pressure increases, leading to a higher hemoglobin level. A normal hemoglobin level for a pregnant woman in her second trimester is 10.5 to 14 g/dL. A hemoglobin level of 11 g/dL is within the normal range, not indicative of hemoconcentration.
Choice B Reason: This is incorrect because a multiple gestation pregnancy is a pregnancy with more than one fetus, such as twins or triplets. A multiple gestation pregnancy can cause a lower hemoglobin level due to increased blood volume and increased demand for iron. A hemoglobin level of 11 g/dL is not suggestive of a multiple gestation pregnancy.
Choice C Reason: This is incorrect because greater-than-expected weight gain is not directly related to the hemoglobin level. Weight gain during pregnancy depends on various factors such as pre-pregnancy weight, nutrition, physical activity, and genetics. A hemoglobin level of 11 g/dL does not reflect the weight status of the pregnant client.
Choice D Reason: This is correct because iron-deficiency anemia is a common type of anemia that occurs when the body does not have enough iron to produce enough red blood cells. Iron-deficiency anemia can cause a low hemoglobin level and affect the oxygen delivery to the tissues and the fetus. A hemoglobin level of 11 g/dL may indicate iron-deficiency anemia, especially if the client has other symptoms such as fatigue, weakness, pale skin, or cravings for non-food items. The nurse should confirm the diagnosis with further tests and recommend iron supplements and dietary changes to treat the condition.
Correct Answer is A
Explanation
Choice A: Hemodilution of pregnancy is a normal physiological phenomenon that occurs when the plasma volume increases more than the red blood cell mass, resulting in a lower hemoglobin concentration. The normal hemoglobin range for pregnant women in the second trimester is 10.5 to 14 g/dL.
Choice B: A multiple gestation pregnancy may cause a higher hemoglobin level due to increased erythropoietin production by the placenta. The normal hemoglobin range for pregnant women with twins in the second trimester is 12 to 16 g/dL.
Choice C: Greater-than-expected weight gain is not related to hemoglobin level. Weight gain during pregnancy depends on various factors such as pre-pregnancy weight, nutrition, activity level, and fetal growth.
Choice D: Iron-deficiency anemia is a condition where the hemoglobin level is below the normal range due to inadequate iron intake or absorption, blood loss, or increased iron demand. The signs and symptoms of iron-deficiency anemia include fatigue, pallor, weakness, shortness of breath, and pica.
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