The Androlab, Inc (Andrology Laboratory Services Inc.) is an independent fertility lab located in the Streeterville area of Downtown Chicago.
Aspermia – Retrograde Flow of Semen
If no ejaculate is produced following masturbation, semen may have flowed back into the urinary bladder. To confirm “aspermia”, the initial fraction of the voided urine following such a “dry” ejaculation should be checked for sperm.
Semen Collection and Processing Methods BY R.S. Jeyendran.
Cambridge University Press, Cambridge, UK.