Over 99% accurate from the day you expect your period (Greater than 99% accurate at detecting typical pregnancy hormone levels. Note that hormone levels vary. See insert). Can tell you 6 days sooner than your missed period (Provides early detection of the pregnancy hormone. You can use the test 6 days before your missed period (5 days before you expect your period). In clinical testing with early pregnancy samples Clearblue gave the following results: Days before the expected period: -1; Pregnancies detected: greater than 99%. Days before the expected period: -2; Pregnancies detected: 98%. Days before the expected period: -3; Pregnancies detected: 98%. Days before the expected period: -4; Pregnancies detected: 94%. Days before the expected period: -5; Pregnancies detected: 71%). Extra wide tip for easy sampling. Provides early detection of the pregnancy hormone (Provides early detection of the pregnancy hormone. You can use the test 6 days before your missed period (5 days before you expect your period). In clinical testing with early pregnancy samples Clearblue gave the following results: Days before the expected period: -1; Pregnancies detected: greater than 99%. Days before the expected period: -2; Pregnancies detected: 98%. Days before the expected period: -3; Pregnancies detected: 98%. Days before the expected period: -4; Pregnancies detected: 94%. Days before the expected period: -5; Pregnancies detected: 71%). Results in 3 - 5 minutes. 2 lines - pregnant, 1 line - not pregnant. English and Spanish instructions inside. Proud to support (March of Dimes does not endorse specific brands or products). March if Dimes: Fighting for healthy moms and strong babies.