Medicine and Healthcare. Black stools can be due to iron supplements or excess iron in the diet. The most serious cause of black stools is bleeding in the GI tract, due to ulcers or some other cause. If the stool is black due to blood, it usually has a tarry feel. If there is just a black color, most likely it is not blood.
Yes, but most doctors will not do it that early. Yes, a vasectomy can be performed on an 18 year old, depending on the circumstances. Yes, a vasectomy can be performed on an 18 year old, depending on the circumstances. 1 year ago by Stephen F. Shaban, MD.
Â· just now. Report Abuse. A man is not permanently sterile after a vasectomy until his sperm has been checked and he has shown to be sterile for two tests. The first test is usually made about two weeks after the vasectomy and the second test a day or two later if the first test proves to be sterile.eport Abuse. Usually a man is still fertile for three years after a vasectomy, though he can remain fertile until he would normally become infertile. The sperm are simply phagocytized, or eaten up/absorbed into the body after three months of being in the vas deferens.