[ s perm– c ervical m ucus c ontact] (for cervical factor infertility) fresh sperm is put both on a slide with cervical mucus and on a slide without mucus, and motility of the two sperm samples is assessed over time. If the sperm shows irregularities of motility through the mucus, there is a problem in the interaction between the sperm and the cervical mucus (cervical factor infertility). Called also Kremer test. .