can work out when you're ovulating based on your last period, an ovulation test uses urine or saliva to help determine your most fertile window. OPKs mainly come in the form of urine tests, but saliva test kits are also available . Here's everything you need to know about how ovulation prediction kits work, what a positive ovulation test actually looks like, and which brands are best value for money.
, taking an over-the-counter test is a quick, easy, and reliable way to predict ovulation in advance. Salivary ferning kits are another type of OPK. These operate rather by monitoring the rise in your oestrogen levels both before and just after ovulation. You test your saliva with a tiny, portable microscope and if your oestrogen levels have risen, the salt content of your saliva increases. When the salt dries, it crystallises into a fern-like pattern, letting you know that you are now in your ovulation window. If you are not in your fertile window, the saliva will just dry in shapeless lumps.
Unlike with pregnancy tests, you will always see two lines on an OPK - the colour of the second line is what determines the point you are at in your ovulation cycle.
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