Some observations on the use of female xenopus laevis for the diagnosis of pregnancy

Pregnancy Diagnosis

“…False positive results have been occasionally reported in the literature (Land¬ grebe, 1939). We have been unable to produce egg-laying in Xenopus with puri¬ fied and biologically active extracts made from the urine of non-pregnant women or men (Hobson, 1958(Hobson, , 1965b. Shapiro (1936), Shapiro & Zwarenstein (1937) and Landgrebe (1939) found that certain steroids would induce ovula¬ tion and oviposition in Xenopus.…”