You can get pregnant on only a few days of each cycle. The timing differs between women and even between cycles, so counting days on a calendar is often not enough. An ovulation test shows when your most fertile days are.
When you are most fertile
Sperm can survive in the body for up to 5 days, while the egg lives for about a day after ovulation. That is why the chance of pregnancy is highest in the few days before ovulation and on the day itself.
How an ovulation test works
Just before ovulation, the level of luteinising hormone (LH) rises sharply. The test detects this surge in urine. A positive result means ovulation is likely within the next 24–36 hours – this is your most fertile time.
When to start testing
Count the first day of your period as day 1. With a 28-day cycle, start testing around day 10–11. For other cycle lengths, use the table in the instruction leaflet. If your cycle is irregular, start based on your shortest cycle.
How to test correctly
- Test at the same time each day, usually between 10:00 and 20:00
- Drink less fluid for a few hours beforehand so the urine is not diluted
- Keep testing daily until you get a positive result
Midstream or strips?
| Test | How to use | Price |
|---|---|---|
| Midstream | Hold in the urine stream or dip into collected urine | €12.80 |
| Strips | Dip into collected urine | €5.42 |
Midstream ovulation test – €12.80 → Ovulation test strips – €5.42 →
Good to know
- An ovulation test is not a method of contraception.
- It does not detect pregnancy – use a pregnancy test for that.
- If you have not conceived within 12 months of trying (6 months if you are over 35), see a doctor.
Rapid tests are intended for preliminary screening and do not replace a doctor’s consultation.
Sources: NHS