The highly sensitive pregnancy test, Tandem ICON HCG-urine, was compared with OPCO "One-step" Pacific Biotech in the gynecological and obstetrical department of Randers Hospital. The purpose was to determine the test specificity and sensitivity of the pregnancy tests in women with possible pregnancies. The test sensitivities were found to be 0.83 and 0.63 for ICON and ONE, respectively. We experienced one and four cases of negative pregnancy tests and ectopic pregnancies with ICON and ONE, respectively. In all cases, the diagnosis of ectopic pregnancy was suspected by other means and the patients submitted to operation. The ICON test showed its supremacy in diagnosis while ONE was easier and cheaper.