Clearblue is over 99% accurate and provides early detection of the pregnancy hormone, allowing for testing up to 6 days before your missed period. The ergonomic design and color-changing, extra-wide tip make it easy to use. Our unique Floodguard™ Technology helps reduce reported usage error by over 70%. With a 10mIU/ml hCG sensitivity, no test can tell you sooner. Clearblue is the No. 1 doctor-recommended brand in the UK, backed by over 40 years of science. The results are easy to read: 1 line means not pregnant, and 2 lines mean pregnant.