The Clearblue Advanced Fertility Monitor is suitable for women whose cycles normally last between 21 and 42 days. If your cycles are always shorter than 23 days or always longer than 37 days it may not detect your LH surge. To work out how long your cycle is note the day your period starts (first day of full menstrual flow) as day 1, and then count through to the day before your next period starts. The total number of days is your cycle length.
There are certain medical conditions and medications that can affect your fertility result. You may get misleading results if you:
• have experienced menopausal symptoms, e.g. night sweats, hot flushes
• have polycystic ovarian syndrome (PCOS)
• have impaired liver or kidney function
• are pregnant, or have recently been pregnant (even if not carried to full term)
• are using hormonal treatments, e.g. hormonal contraception, fertility treatments, hormone replacement therapy
• are using any other treatments which may affect your cycle
• are taking antibiotics containing tetracyclines. Once you have finished your treatment you can start using the Clearblue Advanced Fertility Monitor at the beginning of your next cycle
You are advised to wait until you have had at least 2 natural menstrual cycles in a row (both lasting 23 - 37 days) if you have recently been:
• breast feeding
• using hormonal contraception or treatments
• using any other treatment which may affect your menstrual cycle
• pregnant (even if you have not carried to full term)
Always read the manufacturer’s instructions for any medication you’re taking before using the Clearblue Advanced Fertility Monitor.
Some medications are contra-indicated in pregnancy. We recommend that you consult your doctor if you are taking any medication before you try to get pregnant.
If you use the monitor to test for pregnancy there are certain medical conditions and medications that can affect this result – see Pregnancy Testing Question: "Can any medication or medical conditions affect the results?".
Please Note: There are no products available that can guarantee success in achieving pregnancy. The Clearblue Advanced Fertility Monitor is designed to help you become pregnant and should NOT be used for contraception. Some medications are contra-indicated in pregnancy and we recommend that you consult your doctor if you are taking any medication before you start trying to conceive. Couples with medically diagnosed fertility difficulties should consult their doctor before using this product.
The Clearblue Advanced Fertility Monitor has been shown in laboratory testing to be 99% accurate in detecting the LH surge in cycles in which an LH surge had also been identified by a reference method.
You must set up a new cycle between day 1 and day 4 of each cycle.
To set up a new cycle, press (you can download a full instruction booklet and see page 9 to find out how to set up a new cycle.)
If you have not set up your new cycle by day 4, you should wait until your next period starts and set up a new cycle then.
If the LH surge is not detected and Peak is not displayed you may see more High days than expected. This can be as many as 19 days. If this happens it is unlikely that you are fertile for the whole of this time. It is important to continue to test as requested by the monitor.
The monitor did not detect changes in estrogen or LH during this cycle. There are a number of possible reasons for this, e.g. a test may have been missed or not done correctly, or you may not have ovulated this cycle. It may also be that you did not set a new cycle. Remember that if your period starts then you will need to set a new cycle each time so the monitor knows a new cycle has started.
If you only see Low for 3 cycles you should see your doctor.
This might happen occasionally, e.g. if the rise in estrogen is not detected before the LH surge (Peak), if you miss a test, do one or more incorrectly, or if you have a short cycle following a long cycle.
It is very important to use AA alkaline (LR6) 1.5v batteries. If you do not there is a risk the information stored on your monitor will be lost. Do not use rechargeable batteries.
The monitor depends on a constant supply of battery power. So it is very important to replace the batteries when the monitor asks you to. If the batteries are about to run out, the monitor will switch itself off to protect your information. But, if the batteries are not replaced straight away and the monitor is left without power an error will occur and your information will be lost. You will be unable to use your monitor until you replace the batteries and reprogram it.
Pregnancy Testing Question - Can any medication or medical conditions affect my pregnancy test result?
- Always read the manufacturer’s instructions for any medication you are taking before conducting the test
- Fertility drugs containing hCG can give misleading results (these fertility drugs are usually given by injection, and testing too soon after administration may give a false ‘Pregnant’ result).
- Other fertility therapies (such as clomiphene citrate), painkillers and hormonal contraceptives (e.g. contraceptive pills) should not affect the pregnancy test result
- If you have recently stopped taking hormonal contraception or are using fertility therapies like clomiphene citrate, your periods may be irregular, leading you to test too soon
- If you have recently been pregnant (even if not carried to full term) you may get a false ‘Pregnant’ result
- Ectopic pregnancy, ovarian cysts, menopause and some very rare medical conditions can give misleading results
- If you have a ‘Pregnant’ result it is possible that you later find that you are not pregnant due to natural loss of the pregnancy which can occur in the early stages
- If you do get unexpected results you should discuss them with your doctor
This information is relevant only to the pregnancy test results. See page 3 of the full instructions (download here) to check what medication or medical conditions affect the fertility test results.
Pregnancy Testing Question - The monitor is indicating that my period is due, but I know my cycle isn’t 28 days. Can I rely on this information?
The monitor provides an estimate of your period due date using information it has available, e.g. when your Peak days were or previous cycle details. If this information is not available it works it out based on a 28-day cycle. This is only estimation. If you know your cycle is not normally 28 days you can test for pregnancy when you think your period is due. If you test when your period is due and get a ‘Not Pregnant’ result, test again in 3 days. If this is still ‘Not Pregnant’ and your period has not started you should consult your doctor.