“…The injection of urine from non-pregnant women did not produce these reactions, and Friedman suggested that the method might be useful as a test for pregnancy. Shirai (1930) and Schneider (1930and Schneider ( , 1931 confirmed this. Friedman & Lapham (1931) published results obtained after testing ninety-two urines from pregnant and non-pregnant women and claimed 100% accuracy for the test.…”