Pregnancy Testkit using Human choriongonadotropin (hCG) in urine as a test marker . HCG is a hormone, that increases rapidly in concentration shortly after the release of a fertilised egg cell in a female body. As a result, hCG is a very useful indicator for the detection of a possible pregnancy. The hCG strip test is a chromatographic immuno-chemical test for the rapid qualitative detection of the pregnancy hormone hCG at concentrations from 25 mlU/ml in urine.