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Numark Pregnancy Tests - Ovulation Test Kit 5s

Numark Pregnancy Tests - Ovulation Test Kit 5s

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  • ✔️ Detects LH surge 24–36 hours before ovulation
  • ✔️ Identifies your two most fertile days each cycle
  • ✔️ Five individually foil-wrapped strips per pack
  • ✔️ Suitable for women with regular menstrual cycles
  • ✔️ Results visible in just 5 minutes per test

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What Is an Ovulation Test Kit and How Can It Help You Conceive?

 

Trying to conceive can feel like a waiting game — and timing really does matter. The ovulation test kit from Numark is a straightforward, affordable way to identify your two most fertile days each cycle. Each pack contains five test strips designed to detect the natural rise in luteinising hormone (LH) that signals ovulation is imminent. At just £4.95, it's one of the most accessible fertility monitoring tools available without a prescription in the UK. If you're exploring your wider reproductive health options, you'll also find a range of relevant products in our women's health collection.

Ovulation typically occurs once per menstrual cycle, and the window for conception is surprisingly short — roughly 12 to 24 hours after the egg is released. Detecting the LH surge in advance gives you and your partner the best possible chance of timing intercourse correctly. The NHS confirms that having regular unprotected sex every two to three days throughout the month is generally recommended, but knowing your fertile window can add an extra layer of confidence.

 

How Does the Numark Ovulation Test Kit Work?

 

The test works by detecting a specific hormone in your urine. Here's what happens physiologically:

  • Your pituitary gland produces LH throughout your cycle at low baseline levels.
  • Around the middle of your cycle, LH surges sharply — typically 24 to 36 hours before ovulation occurs.
  • The test strip contains antibodies that bind to LH in your urine sample.
  • If LH is present at surge levels, a visible test line appears that is as dark as, or darker than, the control line — indicating a positive result.
  • A positive result means ovulation is likely within the next one to two days — your most fertile window.

It's worth noting that a faint test line does not count as positive. The test line must match or exceed the intensity of the control line for the result to be considered positive.

 

Who Should Use the Numark Ovulation Test Kit?

 

This kit is designed for women who are actively trying to conceive and want to better understand their cycle. It's particularly useful if you have a fairly regular menstrual cycle and want to pinpoint your fertile days more precisely. That said, it's not suitable for everyone.

This product may be suitable for you if:

  • You have a regular menstrual cycle (typically 21 to 35 days).
  • You are trying to conceive naturally and want to time intercourse more accurately.
  • You have recently come off hormonal contraception and want to track your cycle as it re-establishes.
  • You are monitoring your cycle alongside other fertility awareness methods.

It is not recommended as a contraceptive method. It will not protect against sexually transmitted infections. Women with polycystic ovary syndrome (PCOS), premature ovarian failure, or those taking fertility medications should speak to their GP before using ovulation tests, as results may be unreliable.

 

How Does the Numark Ovulation Test Kit Compare to Digital Alternatives?

 

Feature Numark Ovulation Test Kit 5s Clearblue Digital Ovulation Test
Result format Line-based (visual comparison) Digital smiley face display
Number of tests per pack 5 strips Typically 10 tests
Price £4.95 Approx. £15–£20
Ease of reading Requires line comparison Clear digital readout

 

How Should You Store the Numark Ovulation Test Kit?

 

Store the tests below 30°C in a cool, dry place away from direct sunlight. Do not freeze the strips, as this can damage the antibody coating and affect accuracy. Keep them in their original sealed foil pouches until you are ready to use them, and always check the expiry date printed on the packaging before testing. If you're also taking vitamins and supplements to support fertility — such as folic acid — store those separately according to their own product instructions.

This product is a medical device. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Numark Pregnancy Tests - Ovulation Test Kit 5s specifications
Treatment category Fertility monitoring / Ovulation detection
Mechanism of action Detects LH surge in urine via antibody-based lateral flow immunoassay
Effective Identifies the two most fertile days of the menstrual cycle
Suitable for Women aged 18+ with regular menstrual cycles trying to conceive
Active ingredient Anti-LH monoclonal antibody (detection reagent)
Pack size 5 test strips
UK classification General Sale / Medical Device (CE marked)
Preparation Urine dip test strip
Route of administration Urine (in vitro diagnostic)

Specifications of Numark Pregnancy Tests - Ovulation Test Kit 5s

 

What Is the Numark Ovulation Test Kit and What Is It Used For?

 

The Numark Ovulation Test Kit 5s is an in vitro diagnostic medical device used to detect the luteinising hormone (LH) surge in urine. This surge typically occurs 24 to 36 hours before ovulation, making it the most reliable indicator of your approaching fertile window. The kit is used by women who are trying to conceive and want to identify the days in their cycle when they are most likely to become pregnant. It is not a pregnancy test and should not be used as one.

Each pack contains five individually foil-wrapped test strips. The test is for home use only and is not intended to replace medical advice or fertility investigations. If you have been trying to conceive for 12 months or more without success (or 6 months if you are over 35), the NHS recommends speaking to your GP.

 

What Do You Need to Know Before Using the Numark Ovulation Test Kit?

 

Before using this kit, read the following carefully. Certain conditions and medications can affect your results.

Do not use this kit if:

  • You are already pregnant — elevated hCG can interfere with LH readings.
  • You have reached or are approaching the menopause — naturally elevated LH levels may produce misleading results.
  • You have been diagnosed with premature ovarian failure.
  • You have polycystic ovary syndrome (PCOS) — persistently elevated LH may cause repeated false positives.

Warnings:

  • This test is not a contraceptive and does not protect against pregnancy or sexually transmitted infections.
  • A positive result indicates an LH surge, not confirmed ovulation — ovulation may not always follow.
  • Do not use the test after the expiry date printed on the packaging.
  • Keep out of reach of children.
  • For external diagnostic use only — do not ingest.

Medicines that may affect results:

  • Fertility drugs containing LH or hCG (e.g. Pregnyl, Ovitrelle) — may cause false positives.
  • Clomifene citrate (Clomid) — may affect LH levels and test interpretation.
  • Hormonal contraceptives — if recently stopped, LH patterns may be irregular.

 

How Should You Use the Numark Ovulation Test Kit?

 

Using the test correctly is essential for accurate results. Follow these steps carefully each time you test:

  1. Collect a urine sample in a clean, dry container between 10am and 8pm. Avoid first morning urine.
  2. Reduce your fluid intake for at least two hours before testing to avoid diluting the LH concentration.
  3. Remove one test strip from its foil pouch immediately before use.
  4. Dip the strip into the urine sample up to the MAX line for exactly 5 seconds.
  5. Remove the strip and lay it flat on a clean, dry surface.
  6. Read the result after 5 minutes. Do not read after 10 minutes.
  7. A positive result: the test line is as dark as or darker than the control line.
  8. A negative result: the test line is absent or lighter than the control line.

Begin testing a few days before you expect to ovulate. Use the table below to work out when to start testing based on your cycle length. If you're also managing other aspects of your reproductive health, our condoms and sexual health collection may be useful.

Cycle Length (days) Day to Start Testing
21 Day 5
28 Day 11
30 Day 13
35 Day 18

 

What Are the Possible Side Effects of the Numark Ovulation Test Kit?

 

As an in vitro diagnostic device, the Numark Ovulation Test Kit does not introduce any substance into your body and therefore has no pharmacological side effects. However, there are some considerations worth being aware of.

Common considerations:

  • Emotional distress or anxiety if results are consistently negative or difficult to interpret.
  • Confusion when comparing line intensities, particularly in low-light conditions.
  • Frustration if the LH surge is missed due to infrequent testing.

Less common considerations:

  • Misleading results in women with hormonal imbalances such as PCOS or thyroid disorders.
  • Unexpected positive results caused by certain fertility medications (see warnings above).

If you find that your results are consistently confusing or you are not detecting a surge over several cycles, speak to your GP. They can investigate whether ovulation is occurring and whether further fertility assessment is needed.

 

How Should You Store the Numark Ovulation Test Kit?

 

  • Store at room temperature, below 30°C.
  • Keep away from direct sunlight, heat, and moisture.
  • Do not freeze the test strips.
  • Keep strips in their original sealed foil pouches until immediately before use.
  • Store out of reach and sight of children.
  • Do not use after the expiry date printed on the outer packaging.
  • Dispose of used strips in household waste — they are not sharps and do not require special disposal.

If you are supporting your fertility journey with nutritional supplements such as folic acid, you can browse our vitamins and supplements range for relevant products.

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy the Numark Ovulation Test Kit online in the UK?

You can buy the Numark Ovulation Test Kit 5s directly from Cured Pharmacy online for just £4.95. No prescription is needed and it is dispatched quickly and discreetly. It is also available in some high street pharmacies across the UK.

How does an ovulation test kit detect the LH surge?

The test strip contains antibodies that bind specifically to luteinising hormone (LH) in your urine. When LH reaches surge levels — typically 24 to 36 hours before ovulation — the antibody reaction produces a visible coloured line on the strip. If that line is as dark or darker than the control line, the result is positive.

How do I use the Numark Ovulation Test Kit step by step?

Collect a urine sample in a clean container between 10am and 8pm, then dip the strip to the MAX line for 5 seconds. Lay it flat and read the result at exactly 5 minutes — not before and not after 10 minutes. A test line as dark or darker than the control line means your LH surge has been detected.

When is the best time of day to use an ovulation test?

The best time to test is between 10am and 8pm. LH is produced in the early morning and takes a few hours to reach detectable levels in urine, so first morning urine is not ideal. Reducing your fluid intake for two hours before testing helps avoid diluting the sample and missing the surge.

Can the Numark Ovulation Test Kit give a false positive result?

Yes, certain fertility medications containing LH or hCG — such as Pregnyl or Ovitrelle — can cause elevated LH levels and produce a false positive. Conditions like polycystic ovary syndrome (PCOS) can also cause persistently raised LH, leading to repeated positive results even when ovulation is not occurring. Speak to your GP if you are unsure about your results.

Who is the Numark Ovulation Test Kit suitable for?

It is suitable for women with regular menstrual cycles who are trying to conceive naturally. Women with irregular cycles, PCOS, premature ovarian failure, or those currently taking hormonal fertility treatments should seek GP advice before using this test. It is not suitable for use as a contraceptive method. You can also explore our women's health range for related products.

How many days before ovulation should I start testing?

This depends on the length of your menstrual cycle. For a 28-day cycle, start testing from day 11. For a 35-day cycle, begin on day 18. Count day 1 as the first day of your period, and refer to the cycle length table in the product instructions for your specific cycle.

What does a faint line on the ovulation test mean?

A faint test line means the result is negative — it does not indicate a partial LH surge. The test line must be at least as dark as the control line to be considered positive. If you see a faint line, continue testing daily as your LH levels may be rising and the surge may occur in the next day or two.

What are the alternatives to the Numark Ovulation Test Kit?

Alternatives include digital ovulation tests such as the Clearblue Digital Ovulation Test, which displays a clear smiley face for a positive result and removes the need for line comparison. Fertility monitors that track both LH and oestrogen are also available but are considerably more expensive. The Numark kit offers a cost-effective, reliable option for straightforward cycle monitoring. You can also browse our condoms and sexual health collection for related products.

Can I use the Numark Ovulation Test Kit if I have irregular periods?

It can be more challenging to use ovulation tests with irregular cycles because it is harder to predict when to start testing. You may need to test more frequently across a longer window, which means using more strips per cycle. If your cycles are very irregular, speak to your GP as this may indicate an underlying hormonal condition worth investigating.

Does the Numark Ovulation Test Kit expire?

Yes, all ovulation test strips have an expiry date printed on the outer packaging and on each individual foil pouch. Using an expired test may produce inaccurate results as the antibody reagent degrades over time. Always check the expiry date before testing and do not use strips from damaged or previously opened foil pouches.

How long should I use ovulation tests before seeing a doctor about fertility?

The NHS recommends seeing your GP if you are under 35 and have been trying to conceive for 12 months without success, or if you are 35 or over and have been trying for 6 months. Ovulation tests are a helpful monitoring tool but are not a substitute for a full fertility assessment. Your GP can arrange blood tests and further investigations if needed.

Can I use the Numark Ovulation Test Kit while breastfeeding?

Ovulation can return while breastfeeding, though it is often unpredictable. Prolactin — the hormone that supports milk production — can suppress LH and make ovulation test results harder to interpret. If you are breastfeeding and trying to conceive, speak to your GP or midwife for personalised guidance before relying on ovulation tests alone.

What is the latest research on ovulation test accuracy?

Published clinical literature confirms that LH-based ovulation tests have a high sensitivity for detecting the preovulatory LH surge, with most lateral flow strip tests detecting LH at thresholds of 20–40 mIU/mL. However, research also highlights that LH surge detection alone does not guarantee ovulation has occurred, particularly in women with PCOS. NICE guidance on fertility (CG156) recommends that ovulation tests be used as part of a broader approach to fertility awareness.

Is the Numark Ovulation Test Kit the same as a pregnancy test?

No — they are completely different tests. An ovulation test detects the LH surge that precedes ovulation, while a pregnancy test detects human chorionic gonadotrophin (hCG), a hormone produced after a fertilised egg implants in the womb. You should not use an ovulation test to check for pregnancy, as the results will not be reliable for that purpose.

How Should You Use the Numark Ovulation Test Kit?

Using the test correctly gives you the most reliable results. Always read the full instructions included in the pack before you begin, and make sure you test at the right time of day — between 10am and 8pm is recommended. Avoid drinking large amounts of fluid in the two hours before testing, as this can dilute your urine and reduce LH concentration.

Follow these steps each time you test:

What Is the Correct Dose of the Numark Ovulation Test Kit?

This is a diagnostic test, not a medicine, so there is no pharmacological dose. However, the recommended testing frequency depends on your cycle length and how close you are to your expected ovulation date. Testing once per day is usually sufficient, though some women choose to test twice daily (morning and evening) once they believe the surge is approaching, to avoid missing it.

When Is the Best Time to Use the Numark Ovulation Test Kit?

The optimal testing window is between 10am and 8pm each day. This is because LH is synthesised in the early morning hours and takes several hours to appear in urine at detectable concentrations. Testing too early in the morning — particularly with the first void of the day — risks missing the surge entirely. Consistency matters too: try to test at roughly the same time each day for the most comparable results across your cycle.

Begin testing a few days before you expect to ovulate. To calculate your start day, subtract 17 from your average cycle length. For example, if your cycle is 28 days, begin testing on day 11 (counting day 1 as the first day of your period).

How Long Can You Use the Numark Ovulation Test Kit For?

Each pack contains five test strips, which is typically enough to cover one cycle for most women with regular cycles. You can use a new pack each cycle for as long as you are trying to conceive. There is no clinical limit on how many cycles you can monitor using ovulation tests. However, if you have been using ovulation tests for several cycles without detecting a clear LH surge, or if you have been trying to conceive for 12 months or more without success, speak to your GP for further assessment.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

What Are the Most Common Considerations When Using the Numark Ovulation Test Kit?

Because the Numark Ovulation Test Kit is an in vitro diagnostic device — meaning it works outside the body on a urine sample — it does not introduce any active substance into your system. There are therefore no pharmacological side effects in the traditional sense. That said, there are practical and emotional considerations that are worth knowing about before you start testing.

  • Difficulty interpreting line intensity, particularly in low-light conditions.
  • Anxiety or emotional distress if results are consistently negative or unclear.
  • Frustration if the LH surge is missed due to testing at the wrong time of day.
  • Confusion between a faint line (negative) and a true positive result.

What Are the Less Common Issues Associated With Ovulation Testing?

Some women may encounter less common difficulties that relate to their underlying hormonal profile rather than the test itself. These are not side effects of the product but are important to be aware of.

  • Repeated false positive results in women with polycystic ovary syndrome (PCOS) due to persistently elevated LH.
  • Absence of a detectable LH surge in women with anovulatory cycles (cycles where ovulation does not occur).
  • Misleading results in women approaching the menopause, where LH levels are naturally elevated.
  • Unexpected positive results caused by fertility medications containing LH or hCG.

What Are the Serious Concerns to Be Aware of With Ovulation Tests?

There are no serious adverse effects associated with using an ovulation test strip. However, there are clinical situations where relying solely on ovulation test results could delay appropriate medical care. If you have been trying to conceive for 12 months without success (or 6 months if you are over 35), do not continue testing indefinitely without seeking GP advice. Persistent failure to detect an LH surge may indicate anovulation, which requires medical investigation and is not something an over-the-counter test can diagnose or treat.

What Should You Do If You Experience Unexpected Results?

If you consistently get positive results throughout your cycle, or if you never detect a surge despite testing correctly over multiple cycles, stop testing and speak to your GP. They can arrange blood tests to measure LH, FSH, and progesterone levels, which will give a much clearer picture of your hormonal health. Do not attempt to self-diagnose based on ovulation test results alone.

Can the Numark Ovulation Test Kit Interact With Other Medicines?

The test itself does not interact with medicines in a pharmacological sense. However, certain medications can affect the LH levels detected in your urine and therefore influence the test result. These include fertility drugs containing LH or hCG (such as Pregnyl or Ovitrelle), clomifene citrate (Clomid), and some hormonal therapies. If you are taking any of these, speak to your prescribing doctor or fertility specialist before using ovulation test strips, as results may not be reliable.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

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Content last updated: 31 Mar 2025

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