FIELD : medicine.SUBSTANCE : invention relates to medicine, namely to andrology, and can be used to diagnose male infertility. For this, when the presence of triclosan ≥0.15?ng/ml is detected in the ejaculate by gas chromatography with mass spectrometric detection, the toxic form of infertility is established.EFFECT : method allows for differential diagnosis between idiopathic and toxic forms of male infertility.1 cl, 1 tbl, 4 ex