Sub-Total: £0.00
Progesterone Day 21 Ovulation Test
Understanding whether ovulation is occurring consistently is a vital part of assessing reproductive health, particularly for women trying to conceive or investigating irregular menstrual cycles. Ovulation can sometimes become unpredictable due to hormonal changes, stress, lifestyle factors, or underlying conditions, and these disruptions may not always produce noticeable symptoms. Difficulties conceiving, variations in cycle length, or unexpected changes in menstrual flow can emerge gradually, highlighting the importance of timely insight into ovulatory function.
Progesterone plays a central role in confirming ovulation. After an egg is released, progesterone levels rise during the second half of the menstrual cycle, helping prepare the uterine lining for implantation and supporting early pregnancy. Measuring progesterone around Day 21 of a typical 28-day cycle—approximately seven days after ovulation—provides a reliable indication of whether ovulation has taken place and how well the body is supporting the luteal phase. Imbalances in this hormone may point to ovulatory dysfunction, luteal phase irregularities, or broader endocrine concerns.
Â
Day 21ovulation marker
48 hrsresults turnaround
GPled interpretation
UKASaccredited lab
Why a Day 21 progesterone test matters
Progesterone is the hormone your body produces after ovulation. Measuring it about a week before your period is due — typically day 21 of a 28-day cycle — is a simple, reliable way to confirm whether ovulation has taken place that cycle.
It's a valuable check when you're trying to conceive or investigating your cycle. Because timing is key for an accurate result, we'll help you work out the right day — and every result is reviewed and explained by a GP.
What's included in your Day 21 progesterone test
A single, focused blood test measuring one key hormone.
Hormone tested
Progesterone
What your result can indicate
Ovulation confirmationA raised level suggests ovulation has occurred during this cycle.
Trying to conceiveHelpful insight if you're planning or attempting pregnancy.
Cycle insightAdds to the picture of how your cycle is functioning.
Timing mattersTesting on the right day is essential for an accurate result.
How it works
Book onlineChoose a time that suits you, or call us. Most checks can be booked online.
Quick blood sampleA short, comfortable appointment at one of our clinical sites — around 15 minutes.
Expert lab analysisYour sample is processed by a locally based UKAS-accredited laboratory.
GP-reviewed resultsWithin 48 hours, a GP reviews and explains your results — with clear, personalised advice.
Is this test right for you?
It's a helpful choice if you are:
Trying to conceiveWanting to confirm whether you're ovulating each cycle.
Tracking ovulationBuilding a clearer picture of your fertile window.
Investigating your cycleLooking into irregular or uncertain cycles.
Following upReviewing progesterone after a wider hormone or fertility panel.
Why choose Solasta
GP interpretation, not softwareEvery result is reviewed and explained by an experienced local GP — so you know what it means and what to do next.
Accurate, accredited resultsAnalysed by a locally based UKAS-accredited laboratory (ISO/IEC 17025:2017) for reliable, fast diagnostics.
Continuity of careMore than a one-off test — discreet, unhurried care with ongoing support and follow-up if needed.
What to know before your appointment
Hormonal contraception
It is important to note that hormonal contraception may affect your results. If you stop taking the pill, we suggest waiting until your periods have resumed their normal cycle before taking this test. Make sure that you take an alternative form of contraception if you are not planning to become pregnant.
When to test
For the most accurate measurement of progesterone, we recommend that you test on day 21 of a 28-day cycle, or 7 days before your next menstrual cycle is due.
Biotin (Vitamin B7)
Biotin (Vitamin B7) is a common component of many multivitamins and is also available as a standalone supplement. Biotin is known to interfere with laboratory testing and can affect various blood results. Unless prescribed by your doctor, we recommend stopping supplementation at least 48 hours prior to testing. If the supplement has been prescribed, please speak with your doctor before stopping.
Expect the visit to last 30 minutes
Each visit lasts about 15 minutes, though we recommend you allow yourself a 30-minute window for check-in, any wait time and more.
Progesterone Day 21 Test FAQs
What does this test measure?
It measures progesterone — the hormone produced after ovulation — to help confirm whether ovulation has taken place during your cycle.
When should I take the test?
For the most accurate result, test on day 21 of a 28-day cycle, or 7 days before your next period is due.
Why day 21?
Progesterone peaks around seven days after ovulation, so for a typical 28-day cycle that falls on about day 21 — giving the clearest indication of ovulation.
Can hormonal contraception affect my results?
Yes. See the guidance above, and let us know what you're taking so your GP can take it into account.
How long do results take?
Results are typically ready within 48 hours of your sample reaching the laboratory, after which a GP reviews and explains them.
Will a doctor explain my results?
Yes. Your result is interpreted by an experienced GP with personalised guidance and any recommended next steps.
How long is the appointment?
The sample itself takes about 15 minutes, but we suggest allowing a 30-minute window for check-in and any wait time.
Related checks & services
AMH TestA focused measure of your ovarian reserve.
Female Hormonal HealthThe key reproductive hormones with a urinalysis screen.
Fertility HealthA comprehensive hormone and health panel for your fertility journey.
Well WomanA comprehensive general health check across all the major systems.
Ready to understand your health?
Book your Progesterone Day 21 Ovulation Test online, or call us — NI 028 40 648 486 · ROI +353 1906 1950.
Book your Progesterone Day 21 Ovulation Test online, or call us — NI 028 40 648 486 · ROI +353 1906 1950.