[The effect of glass wool filtration on human spermatozoa--a comparison with the swim-up technic]

20 fresh human ejaculates (6X normozoospermia, 7X oligozoospermia and 7X asthenozoospermia) were prepared either with the swim-up-method as with the glass wool filtration. After both techniques the motility of the spermatozoa improved markedly. In cases of asthenozoospermia and oligozoospermia the motility increased significantly compared with the value of the ejaculate. From the motile spermatozoa of the ejaculate 45-60% were detectable in the filtrat after glass wool filtration or in the upper fluid after swim-up-procedure.