How do home pregnancy tests work?

Home pregnancy tests work by detecting the pregnancy hormone, human chorionic gonadotrophin (HCG) in your body. In the early weeks of pregnancy the amount of HCG in your body increases and can be detected in your urine.

When you first become pregnant your body produces large quantities of HCG, which becomes present in your blood and your urine. Home kits test your urine – only a doctor can perform a blood test for pregnancy.

When can I use one?

Most home pregnancy tests work from the day your period is due. You can do the test at any time of the day, although your urine is more concentrated first thing in the morning. Avoid drinking too much fluid before taking a test as this can dilute the level of HCG in your urine.

How do I use it?

Most home pregnancy tests work by placing the stick in urine – either in a pot, or directly under you as you urinate. Always read the instructions carefully, as different tests display the results in different ways.

Will my GP do their own test?

If used correctly, home pregnancy tests are as accurate as those used by doctors. Your GP is not likely to repeat the test, although some may take a blood test.

How accurate are they?

It is extremely rare to get a false positive – so if your test reads positive, then you are almost certainly pregnant. However, if you have recently had a miscarriage, or given birth you may still test positive due to the level of HCG in your body.
False negatives are more common, as if you do a test too early, the amount of HCG in your body may not yet be high enough to read. If you get a negative result, but still think you could be pregnant, wait another few days then test again.

Where can I get one?

You can buy home pregnancy tests at most pharmacies and in many large supermarkets. Some GPs offer free tests.