What Affects the Semen Analysis?

There are some factors which may intervene the test or the accuracy of the test.

1. Caffeine, alcohol, cocaine, marijuana and smoking tobacco.

2. Medications, such as cimetidine (Tagamet), male and female hormones (testosterone, estrogen), sulfasalazine, nitrofurantoin, and some chemotherapy medications.

3. Herbal medications, such as St. John's wort and high doses of echinacea.

4. Not ejaculating for about 1-2 weeks, as this affect the activeness of the semen and the semen volume.

5. Exposure to radiation, some chemicals such as certain pesticides or spermicides, and prolonged heat exposure. 

 

Source : http://aboutmypregnancy.blogspot.com/2010/09/what-affects-semen-analysis.html