1. Collect urine in a clean and dry container. Do not use morning urine. The best time to collect urine is from 10:00 am to 8:00 pm. Try to use urine sample at same time every day. The urine should be reduced 2 hours before collecting urine. Ingestion. 2. The test strip be immersed in urine with one end of mark line. After about three seconds, it be taken out and laid flat for 10-20 minutes. The result be read within 30 minutes. The depth of test paper inserted into urine should not exceed MAX mark line.Normal women ovulate every month. After an egg matures in ovary, it is excreted from ovaries and transported to uterus via fallopian tubes. The pregnancy process is formed by a egg in fallopian tube combined with sperm. Sperm can survive for about 24-72 hours in female reproductive tract, while an egg is fertilized only about 24-36 hours after ovulation. Women should first determine their own menstrual cycle before testing. The algorithm is a cycle from first day of menstruation to day before menstrual period (the first day of first blood day). Most women ovulate in menstrual period. The first 14 days or so, so 2-3 days before ovulation and 1-2 days after ovulation is easy to receive pregnancy, that is, 4-5 days before and after ovulation day is estimated to be susceptible to pregnancy, so it should be tested regularly after starting test. Model Number: Ovulation Test Strip Item Type:Feminine Hygiene Stage: Pre-pregnancy Fragrance type: no fragrance type aluminum foil bag packaging (with desiccant to protect against moisture) Colour:Pink Material:Aluminum bags Size:10.5x5.5cm Package Contents: 1 pack x (90 pieces) Ovulation Test Strip Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.