How Pregnancy Tests Work

Short of visiting a doctor, a pregnancy test is the best way to answer the question “Am I pregnant?” Learn how FIRST RESPONSE™ pregnancy tests detect the hCG hormone levels in a woman’s urine to determine if she is pregnant, and understand how early detection is better for you and better for baby.

Detecting Pregnancy Hormones:

From the earliest moments of conception, your body is already starting to undergo monumental changes. One of the very first is production of the pregnancy hormone, hCG (human Chorionic Gonadotropin), which can be detected in your blood and in your urine. The amount of hCG in your body increases rapidly. It doubles every 36 to 48 hours as your pregnancy progresses, reaching its peak at eight to ten weeks. Pregnancy tests work by detecting hCG levels in your urine. When a woman’s urine comes in contact with the specially treated strip on a pregnancy test stick, results appear within minutes, indicating whether or not hCG, the pregnancy hormone, has been detected.

About Pregnancy Tests:

Some at-home pregnancy tests are unable to detect HCG in urine sooner than the first day of a missed period. As Australia’s leading at-home pregnancy test brand, advancements in sensitive technology have enabled FIRST RESPONSE™ Early Result In-Stream Pregnancy Test and FIRST RESPONSE™ Digital Pregnancy Test to detect the level of HCG in your body 6 days before a missed period1 2.


1 In clinical testing FIRST RESPONSE™ In-Stream Pregnancy Tests detected the hormone levels in 62% of women, 6 days before the day of the missed period (5 days before the day of expected period), in 78% of women 5 days before their missed period, in 87% of women 4 days before their missed period, in 98% of women 3 days before their missed period and in 99% of women 2 days before their missed period.
2 In clinical testing FIRST RESPONSE™ Digital Pregnancy Tests detected the pregnancy hormone levels in 60% of pregnant women 6 days before their missed period (5 days before their expected period), in 86% of pregnant women 5 days before their missed period, in 96% of pregnant women 4 days before their missed period, in >99%of pregnant women 3 days before their missed period, in >99% of pregnant women 2 days before their missed period and in >99% of pregnant women 1 day before their missed period (day of expected period).