Differentiating Klinefelter's Syndrome from other Diseases

Template:Klinefelter's Syndrome Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Eiman Ghaffarpasand, M.D. [2]

Overview

Klinefelter's syndrome must be differentiated from other diseases that cause latency in secondary sexual characteristics development, such as constitutional delay of puberty, hypopituitarism, delayed puberty, and chromosomal abnormalities. Chromosomal abnormality is Noonan's syndrome.

Differentiating Klinefelter's syndrome from other diseases

• Klinefelter's syndrome must be differentiated from other diseases that cause latency in secondary sexual characteristics development, such as constitutional delay of puberty, hypopituitarism, delayed puberty, and chromosomal abnormalities. Chromosomal abnormality is Noonan's syndrome.

Diseases		Laboratory Findings					Physical examinations				Other Findings
		GnRH	LH	FSH	Estradiol	Testosterone	Lack of secondary sexual characteristics	Amenorrhea	Webbed neck	Final height
Klinefelter's syndrome		↓	↑	↑	-	↓	+	-	-	Nl	Testicular dysgenesis
Delayed puberty	Primary hypogonadism	↑	↑	↑	↓	↓	+	+	-	↓	-
	Secondary hypogonadism	↓	↓	↓	↓	↓	+	+	-	↓	-
Constitutional delay of puberty		Nl	Nl	Nl	Nl	Nl	+	+	-	Nl	Normal puberty, finally
Hypopituitarism		↑	↓	↓	↓	↓	+	+	-	↓	-
Noonan's syndrome		↓	↑	↑	-	↓	+	-	+	Nl	Mitral valve prolapse
Outflow tract obstruction (imperforate hymen or transverse vaginal septum)		Nl	Nl	Nl	Nl	Nl	-	+	-	Nl	Imperforate hymen Perirectal mass Bulging hymen with hematocolpos
Mayer-Rokitansky-Kuster-Hauser syndrome		Nl	Nl	Nl	Nl	Nl	-	+	-	Nl	Variable absence of Mullerian structures in pelvic ultrasound