In 10 patients cured for metastatic testicular cancer by combination chemotherapy serum hormone levels and serum agglutinating antibodies were analysed 12 to 35 months after discontinuation of the treatment. Together with these examinations sperm analysis was done. All patients had increased levels of follicle stimulating hormone (FSH). Serum testosterone was usually in the lower part of the normal range (below 20 nmol/***l). In eight patients the serum agglutinating antibodies were normal, while two patients had increased levels. In all patients azoospermia was observed, indicating long‐lasting infertility in patients testicular cancer treated by combination chemotherapy. The possible importance of cryopreservation prior to start of chemotherapy is discusse