To stabilise and improve spermatozoa cryopreservation results and in vitro fertilization rates for laboratory mice Sperm cryopreservation is a practical and cost-effective method of archiving mouse strains in a laboratory. FERTIUP® and CARD MEDIUM are high-performance media for mouse sperm cryopreservation, sperm preincubation and in vitro fertilization (IVF). When used in combination, FERTIUP® and CARD MEDIUM provide a high and stable rate of fertilization from frozen-thawed mouse sperm, which will allow you to reproduce mice as and when you need them.