A steroid-like chemical which is a by-product of the breakdown of certain steroids; they are found in urine and measuring them can give a good indication of the level of androgen production in the body. The major ketosteroids are:

* androsterone
* etiocholanone
* estrone

From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.