- Please always read the instructions on the pack and in the leaflet carefully before use.
- You need to know your usual cycle length before you start, to ensure you test at the right time to find your LH surge
- To work out your cycle length, count the day period starts (first day of full menstrual flow) as Day 1, and continue counting through to the day BEFORE your next period starts €“ the number of days is your cycle length.
- Once you know your cycle length, use the table below to find out when to start testing:
Your cycle length in days | 21 or less | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 or more |
Start testing on the day next to your cycle length | 5 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 17 days before your next period |
- You can test at any time of the day, but you should test at the same time of day each day.
- Try not to urinate for four hours before you do the ovulation test, and you should avoid excessive fluid intake before testing €“ you might find it easier to use the first urine of the day.
![Before testing](https://ar-en.clearblue.com/sites/default/files/wysiwyg/products/how-to-use/pictures/dot7ctht01a.png)