It can identify the infertile patient who then requires further testing to discover the causes.
• The NUMBER of sperms in the old test did not give a true idea of the sperm’s ability to fertilize, whereas, the computer in the new test counts the number of motile spermatozoa only, and ignores non motile or poorly motile sperm.
• MOTILITY cannot be assesed by the naked eye as spermatozoa swim with different motility in various directions so the result would be purely subjective. On the contrary the CASA computer is able to isolate those sperms with good forward movement and also takes into account their Velocity, Linearity and Rectilinearity wich the previous tests ignored. The CASA computer test therefore provides more complete but above all, more objective results.
• MORPHOLOGY the naked eye cannot identify oval shaped sperms, which are the most fertile. When morphology is the cause of infertility, the CASA computerized test can identify this as it measures the diameters of each sperm head, calculates perimeter and area thus providing the true percentage of oval shaped sperms.
So the CASA computerized tests, taking into consideration motility and morphology together in this new way assess the true fertility level of the spermatozoa.
ALH measures the lateral movement of the sperm head, which gives a clear idea of whether the sperm can swim in the cervical mucus. Since a sperm with low ALH will be unable to penetrate the cercival mucus, it is essential to assess ALH value.
BCF measures the number of beats of the sperm’s tail and therefore provides information about its ability to swim in thecervical female mucus.
PROGRESSIVE VELOCITY reveals how many sperms are fertile while other factors such as linearity and straightness tell us whether the sperms will swim in a direct rather than errant line, as the latter risk not reaching the uterus.
THIS IS WHY A CASA COMPUTERIZED SPERM TEST NEEDS TO BE DONE AS SOON AS POSSIBLE