Frequently asked questions - Advanced Fertility Monitor

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.

• 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.

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.