It is permissible to masturbate for the purpose of medical testing?

I know masturbation is haraam in Islam. But if one want to check for the infertility, the laboratory people asking the sperm's of the man. We can't get the sperm without masturbating in the laboratory.

Reply:

Islam Yes, that is permitted. It says in
Fataawa al-Shaykh 'Abd al-'Azeez ibn Humayd (may Allaah know mercy on him) that he was asked virtually that and he replied:  
There is naught immoral with that so durable as there is a condition for it. Whoever masturbates without there beingness a condition for it should be disciplined. But this is for a demand, which is to produce humour for testing and to gestate out the reasonableness why this someone is not having children. The represent for that may reside with him or with his spouse, so in this individual there is null dishonourable with it insha-Allah. 
 From Fataawa al-Shaykh 'Abd al-'Azeez ibn Humayd, p. 271.