clearblue fertility monitor

Clearblue ovulation tests detect luteinizing hormone (LH). Clearblue Advanced Digital ovulation tests also detect the estrogen metabolite E3G. Related Clearblue pregnancy tests detect the pregnancy hormone hCG.

Most Clearblue tests produce a result in about 3 to 5 minutes. Some Clearblue pregnancy tests may show a positive result earlier, but manufacturers note up to about 3 minutes as a confirmation window for a not-pregnant result.

Clearblue uses a few common result formats: digital displays that show icons (e.g., a flashing smiley for high fertility and a steady smiley for peak fertility), a blank circle when no result is detected, and analogue formats like colored lines or +/- indicators on strip-style tests.

Clearblue ovulation tests detect the LH surge, which typically happens about 24–36 hours before ovulation. That detection gives roughly a 48-hour window to act on the result.

Basic Clearblue ovulation tests are described as identifying the two most fertile days. Clearblue Advanced Digital tests typically identify a larger fertile window—often four or more fertile days.

Clearblue ovulation test sticks can be used directly in your urine stream or dipped into a urine sample collected in a clean, dry container.

Available product details state Clearblue ovulation tests are designed to detect low LH surges, including levels below about 25 mIU/mL. Some Clearblue pregnancy tests list sensitivity around 25 mIU/mL for hCG detection.