which can be lethal for some spermatozoa. A single semen sample is not determining for disease diagnosis, so two different samples have to be analyzed with an interval between them of seven days to three months, as sperm production is a cyclic process. It is prudent to ask about possible sample loss, as that could mask true results of spermiogram. To obtain the sample, a sterile plastic recipient is put directly inside, always no more than one hour before being studied. Conventional preservatives shouldn't be used, as they have chemical substances as lubricants or spermicides that could damage the sample. If preservatives have to be used, for cases of religious ethics in which masturbation is forbidden, a preservative with holes is used. In case of paraplegia it is possible to use mechanic tools or electroejaculation. The sample should never be obtained through coitus interruptus for several reasons: Some part of ejaculation could be lost. Bacterial contamination could happen. The acid vaginal pH could be deleterious for sperm motility. Also is very important to label the sample correctly the recipient with patient identification, date, hour, abstinence days, among other data required to be known. The volume of the semen sample (must be more than 1.5 ml), approximate number of total sperm cells, sperm motility/forward progression, and % of sperm with normal morphology are measured. It is possible to have hyperspermia (high volume more than 6 ml) or Hypospermia (low volume less than 0.5 ml). This is the most common type of fertility testing. Semen deficiencies are often labeled as follows: Oligospermia or oligozoospermia – decreased number of spermatozoa in semen Aspermia – complete lack of semen Hypospermia – reduced seminal volume Azoospermia – absence of sperm cells in semen Teratospermia – increase in sperm with abnormal morphology Asthenozoospermia – reduced sperm motility Necrozoospermia – all sperm in the ejaculate are dead Leucospermia – a high level of white blood cells in semen Normozoospermia or normospermia – It is a result of semen analysis that shows normal values of all ejaculate parameters by WHO but still there are chances of being infertile. This is also called as unexplained Infertility There are various combinations of these as well, e.g. Teratoasthenozoospermia, which is reduced sperm morphology and motility. Low sperm counts are often associated with decreased sperm motility and increased abnormal morphology, thus the terms "oligoasthenoteratozoospermia" or "oligospermia" can be used as a catch-all.