Menstrual cycle & ovulation
OPKs indicate that ovulation is likely soon. They can be less reliable with PCOS or irregular cycles, where LH may be raised for longer. NICE does not recommend routine use for people having regular sex, as it can add stress.
Also known as: OPK, ovulation test, ovulation sticks
Last reviewed: 23 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.