Clearblue Pregnancy Test With Early Weeks Indicator 2

Clearblue Pregnancy Test With Early Weeks Indicator (2 pack) is like 2 tests in 1 - it first detects if the pregnancy hormone is present with over 99% accuracy from the day of your expected period, and if you are pregnant, it also indicates how many weeks since conception occurred 1-2, 2-3 or more than 3 weeks (3+). The Weeks Indicator is 93% accurate in detecting when you conceived. Within 3 minutes your 'Pregnant' or 'Not Pregnant' result in words will appear on the screen. If the result is 'Pregnant' the test will also indicate time since conception occurred (1-2, 2-3 or 3+ weeks).

The Clearblue Pregnancy Test with Weeks Indicator is the latest innovation in pregnancy testing. It is an over-the-counter semi-quantitative urine test for human chorionic gonadotrophin (hCG), which is intended for the detection of pregnancy. It is a simple-to-use product that is unique because it not only informs the user whether she is pregnant or not, but also indicates the time since conception occurred, shown on screen as 1–2, 2–3 and 3+, indicating weeks since conception.

Key Features & Benefits:

• The Clearblue Pregnancy Test with Weeks Indicator is over 99% accurate at detecting pregnancy from the day of the expected period.
• The Weeks Indicator feature uses known levels of hCG in urine relative to the day of the luteinising hormone (LH) surge to estimate time since conception
• Agreement between Clearblue Pregnancy Test with Weeks Indicator results and time since conception by LH surge detection (± 1 day) is 93%
• It is also sensitive enough to be used up to 5 days before the missed period (which corresponds to 4 days before the expected period

LH surge – An accurate method for referencing time since conception

Identifying the day of fertilisation is the most accurate method for dating pregnancy. It can be estimated from the day of ovulation, as studies have shown that the egg only survives for up to 24 hours and a woman’s fertile period ends on the day of ovulation.

LH is a hormone produced by the anterior pituitary gland. A surge in LH triggers ovulation and initiates the conversion of the residual follicle into a corpus luteum that, in turn, produces progesterone to prepare the endometrium for a possible implantation. The World Health Organization has defined the rise in circulating LH as the best indicator for impending ovulation, and the day of ovulation is considered a surrogate marker for conception, as conception can only occur within 24 hours of egg release. Levels of LH in urine correlate 100% with ultrasound detection of ovulation.

A prospective study using the Clearblue Fertility Monitor found that the LH surge preceded the day of ovulation in 76% of cycles where there was a surge, and was within ±1 day of agreement for 97% of these cycles. Therefore, ovulation can be presumed to occur on the day of the LH surge +1 (with a ±1 day range).