Total 47 clinical symptoms reported for Classic congenital adrenal hyperplasia due to 21-hydroxylase deficiency 
Abnormal response to ACTH stimulation test An anomalous response to stimulation by administration of the adrenocorticotropic hormone (ACTH). ACTH stimulation normally stimulates the adrenal glands to release cortisol and adrenaline.
 
Synonyms:Abnormal response to adrenocorticotropic-hormone stimulation test; Abnormal response to corticotropin stimulation test
Very frequent
Decreased circulating cortisol level Abnormally reduced concentration of cortisol in the blood.
 
Synonyms:Decreased cortisol production; Glucocorticoid insufficiency; Hypocortisolemia; Low blood cortisol level; Low to undetectable plasma cortisol; Plasma cortisol low
Very frequent
Elevated circulating 17-hydroxyprogesterone concentration An increased level of 17-hydroxyprogesterone in the blood. 17-hydroxyprogesterone is an intermediate steroid in the adrenal biosynthetic pathway from cholesterol to cortisol and is the substrate for steroid 21-hydroxylase.
 
Synonyms:Elevated circulating 17-hydroxyprogesterone; Elevated circulating 17-OHP
Very frequent
Increased circulating androgen concentration An elevation of the blood concentration of an androgen, that is, of a steroid hormone that controls development and maintenance of masculine characteristics. The androgens include testosterone and Dehydroepiandrosterone.
 
Synonyms:Hyperandrogenemia; Increased circulating androgen level
Very frequent
Increased circulating progesterone An elevated concentration of progesterone in the blood.
 
Very frequent