When you see a doctor because you're having trouble getting your partner pregnant, he or she will try to determine the underlying cause. Even if your doctor thinks low sperm count is the problem, it is recommended that your partner be evaluated to rule out potential contributing factors and determine if assisted reproductive techniques may be required. This includes examination of your genitals and asking questions about any inherited conditions, chronic health problems, illnesses, injuries or surgeries that could affect fertility. Your doctor might also ask about your sexual habits and your sexual development.
Low sperm count - NHS
If a couple has been trying to conceive a child for a while, they may become worried that the man might have a low sperm count. If this is a concern, he can go to the doctor for a sperm count and motility assessment. Optimally, a couple will want the results of the assessment to show that the man has sperm count levels that are between 40 and million sperm per milliliter of semen. A semen sample with less than 20 million sperm per milliliter is considered to have a low sperm count. Receiving a diagnosis of low sperm count can be very hard for any man to hear.
Sperm Count: Are You Above or Below Average?
Low sperm count means that the fluid semen you ejaculate during an orgasm contains fewer sperm than normal. A low sperm count is also called oligospermia ol-ih-go-SPUR-me-uh. A complete absence of sperm is called azoospermia. Your sperm count is considered lower than normal if you have fewer than 15 million sperm per milliliter of semen. Having a low sperm count decreases the odds that one of your sperm will fertilize your partner's egg, resulting in pregnancy.
Terms oligospermia , oligozoospermia , and low sperm count refer to semen with a low concentration of sperm  and is a common finding in male infertility. Often semen with a decreased sperm concentration may also show significant abnormalities in sperm morphology and motility technically oligoasthenoteratozoospermia. There has been interest in replacing the descriptive terms used in semen analysis with more quantitative information. The diagnosis of oligozoospermia is based on one low count in a semen analysis performed on two occasions.