Klinefelter syndrome is diagnosed by:
**Core Concept**
Klinefelter syndrome is a chromosomal disorder characterized by the presence of one or more extra X chromosomes in males (47,XXY). This condition leads to various physical and developmental abnormalities.
**Why the Correct Answer is Right**
Klinefelter syndrome is typically diagnosed through karyotyping, a genetic test that examines the number and structure of an individual's chromosomes. This test can identify the presence of extra X chromosomes. In some cases, diagnosis may also be made through physical examination, medical history, and laboratory tests such as hormone level measurements.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not specified, so it cannot be evaluated.
* **Option B:** Fetal ultrasound is used to detect congenital anomalies, but it is not the primary method for diagnosing Klinefelter syndrome.
* **Option C:** Chromosomal microarray analysis is used to detect copy number variations, but it is not the standard test for Klinefelter syndrome diagnosis.
**Clinical Pearl / High-Yield Fact**
Klinefelter syndrome is the most common sex chromosome disorder, affecting approximately 1 in 650 males. It is essential to recognize the condition's characteristics, such as tall stature, gynecomastia, and infertility, to provide timely and appropriate management.
**Correct Answer:** B. Fetal ultrasound is used to detect congenital anomalies, but it is not the primary method for diagnosing Klinefelter syndrome.