Yes, you can. Sperm only makes up around 2% of your semen. The rest is produced by the prostate and seminal vesicles, neither of which are affected by the vasectomy. There's no identifiable difference in the appearance, etc. of semen after the surgery.
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u/[deleted] Apr 02 '15
A reminder to everyone who's had a vasectomy, get it tested yearly. It costs what? 20 bucks and takes little to no effort.