Human chorionic gonadotrophin (hCG) is a pregnancy hormone produced by the placenta when a fertilised egg implants in the uterine wall. The hormone hCG starts to be produced around six days after fertilisation and can usually be detected 10 days after a missed menstrual period.
What might a low result mean?
A negative hCG result does not necessarily mean that you are not pregnant as hCG may not be detectable even with this sensitive test, especially if you tested early or ovulated late. A repeat test is recommended if your period has not arrived after another 3 days.
What might a high result mean?
An elevated hCG result confirms a positive pregnancy test result. As the pregnancy develops, levels of hCG increase.