Updated: Jan 30
How do fertility tests work? Do I need to have fertility tests?
You and your partner want to get pregnant as easily and quickly as possible and have a beautiful healthy baby.
You want to know what to do before you start.
You've heard about a fertility test and want to know more.
This is part 1 of a 3-part series on fertility tests will explain what is involved, what information it can offer you, when and where you can get tested and whether you should test before you start trying to conceive.
Part 1 of this series will answer and discuss:
· What is fertility?
· What is conception?
· What are fertility tests?
· When is fertility testing done?
· How fertility tests work and how fertility is tested.
· Should I have a fertility check before I start trying to conceive?
· Fertility tests on the NHS
Part 2 will discuss fertility tests for women including
· Where can I get fertility testing done?
· How much does a fertility test cost?
· What happens after the tests?
Part 3 will discuss fertility tests for men including
· Where can I get fertility testing done?
· How much does a fertility testing cost?
· What happens after the tests?
Fertility tests: summary points
The process of becoming pregnant is complex with many moving parts. A number of factors need to be right including timing of sexual intercourse, the quality of sperm and eggs and correct hormone levels. This can mean that getting pregnant can take longer than expected.
Speak to or see a GP or practice nurse for a preconception review consultation, if possible at least 3-6 months before you start trying to conceive and ideally earlier. You will be able to discuss your overal health and receive preconception advice. They can check your blood pressure, weight and height and may arrange blood tests to check your iron levels or vitamin D.
If you have menstrual symptoms e.g. heavy and painful periods and you haven’t had
investigations before your GP can arrange an ultrasound scan or referral to a
gynaecologist. If you have a known cause of infertility or history of predisposing
factors for infertility e.g. endometriosis, polycystic ovarian syndrome you may require
early referral to the relevant specialist.
Your healthcare professional may also recommend taking a prenatal supplement and suggest lifestyle changes. A dietician can also provide you with more detailed nutrition advice.
Over 80% of couples under 40 years of age, that have sex twice a week and are not using contraception will become pregnant within 1 year. Over 90% of couples will get pregnant within 2 years of trying if they have sex twice a week without using contraception.
Over 50% of women aged under 40 years will conceive within 6 cycles of artificial insemination. Over 75% of women will conceive within 12 cycles of artificial insemination.
Please be aware that getting pregnant can take time. It can take 1-2 years or even longer if you are over 40. If it's taking longer than you expected, it does not mean that something is wrong with you.
If you have regular sex, you do not have to do any fertility testing or ovulation tracking initially. Having regular sex every 2-3 days every month, without using condoms or any contraception, can be sufficient to become pregnant assuming that all other factors are aligned. This is the natural way to conceive. It may take up to 1-2 years or may happen much sooner, but if you understand that it takes time and if you are able to accept it takes time this can relieve some pressure on yourselves.
Using methods to help identify the most fertile time during your menstrual cycle i.e. when you are most likely to be ovulating and when your chances of fertilisation are higher are important:
*If you are using artificial insemination to conceive
*If you are not having regular sex and want to get pregnant
*If you want to try to improve how quickly you get pregnant. This is not a proven
fact and insufficient evidence is available to back this particular statement.
If you understand when you are most likely to be ovulating then you can work out
your most fertile time and inseminate or have sex during this timeframe. There are
many tools available to help you do this and they will be discussed in part 2 of the
Any other fertility testing is not necessary before starting to try to conceive unless you have underlying condition or predisposing factors for infertility. Anti-müllerian hormone (AMH)blood test and ovarian reserve tests are discussed in part 2 of the series.
You should be offered clinical assessment and investigations if you have not become pregnant after:
* 6 months of trying to conceive if you are aged 36 or over.
* 12 months if you are 35 years old or younger.
Fertility investigations for females will be discussed in part 2 of this series and for males in part 3 of this series.
What is fertility?
Fertility is defined as the actual production of live offspring (Stedman's Medical Dictionary).
It is the ability to get pregnant and have a baby. The ability to become pregnant without medical intervention requires sexual intercourse or artificial insemination.
Assisted reproductive technology (ART) e.g. IVF is used to help people who have subfertility (delay in the ability to become pregnant) or infertility (people who are unable to become pregnant without assisted reproductive treatments).
The World Health Organization gives several definitions of infertility. The definition most commonly used by healthcare professionals is ‘the inability of a sexually active, non-contracepting (i.e. not using contraception) couple to achieve pregnancy in one year’.
What is conception?
Conception is the act of conceiving or becoming pregnant (Stedmans Medical Dictionary).
In order to conceive naturally, without any assisted intervention (such as IVF), there are a number of events that need to occur in the male and female body. In summary
Ovulation and transportation of an egg to the fallopian tube.
Production, ejaculation and transport of sperm to the fallopian tube in the female.
Fertilisation (fusion of the egg and sperm) to create a cell called a zygote which divides to create a ball of cells called the blastocyst.
Implantation of the blastocyst into the uterine lining.
Click here to find a good overview of fertility including female and male factors related to fertility and conception are given. I've also explained in a bit more detail below:
1. At least one egg surrounded by follicles needs to grow and mature. The eggs are found within the ovaries. Follicle stimulating hormone (FSH) is a hormone released by the anterior pituitary gland in the brain. FSH works on the ovaries to encourage one egg and the follicle cells around the egg to grow and mature. The eggs start to produce oestrogen.
2. The egg should be healthy, contain good quality genetic material and therefore be free from chromosomal defects.
3. The egg will move out from the ovary. This is called ovulation. The follicle cells remain inside the ovary. The egg travels down a patent fallopian tube. The fallopian tube must be free from blockages. Ovulation occurs when lutenizing hormone (LH) another hormone produced by the anterior pituitary gland reaches its peak. After ovulation the LH and FSH levels fall.
4. The follicle cells remaining in the ovary form a corpus luteum. The corpus lutem produces progesterone which helps support conception i.e. fertilisation and implantation of the fertilised cells into the lining of the womb.
5. The sperm need to be produced inside the male testes. The sperm should contain good quality genetic material and be free from chromosomal defects.
6. If you have sexual intercourse at the right time; when the male ejaculates, the healthy sperm must travel up into the vagina, through the cervix and into the womb to meet the egg in the fallopian tube. Alternatively, if using IUI, the semen must be inserted at the right time.
If mucus is thick or the womb is hostile to sperm, the sperm will not be able to pass through. After ovulation the egg must be fertilised by a sperm within 12- 24 hours. Sperm can live in the uterus and fallopian tube for up to 5 days. They may reach the fallopian tube within 1 hour or a few days. The chances of fertilisation are best when sperm is already in the fallopian tube when the egg arrives.
7. The sperm and egg meet together, the sperm to fertilises the egg (only one sperm can fertilise a single egg) but if two or more eggs are in the fallopian tube, one separate sperm can fertilise each egg.
8. Once fertilisation occurs the cells from the sperm and egg divide to create a zygote. The cells of the zygote divide and continue to divide while travelling towards the endometrium (lining of the female womb).
9. The endometrium needs to be thick enough and ready to accept the cells which is now called a blastocyst. Cells of the blastocyst produces beta HCG- the pregnancy hormone).
10. The blastocyst embeds and implants into the endometrium. The levels of beta HCG continue to rise.
11. You are pregnant. The beta HCG levels are high enough to be detected and they keep rising as the blastocyst develops into a foetus.
This is just the process of conception!!
At this stage you would take your pregnancy test after a missed period.
You can watch this video below for more information about conception. I selected this video because it is a good starter video; and gives a simple, well-illustrated example of conception.
After conception foetal development continues including development of the heart, lungs, nervous system, gut, skin etc as well as changes to mothers’ body to prepare for birth and feeding the new-born.
This just illustrates how many different embryological and physiological processes are involved in creating a new baby. It’s incredible, fascinating and complex; it’s almost magical!
But the reality is that we can only have tests to analyse a fraction of all that happens in this whole process.
When it comes to becoming pregnant and having a baby; there are a number of tests that can be performed but overall the information provided by fertility testing can not provide all the answers you want; namely your individual chances of getting pregnant and having a baby.
What are fertility tests?
If we use the definition of 'fertility' discussed in the previous section, then fertility testing would comprise tests used to assess the whole process from becoming pregnant to delivering the baby.
When the fertility industry talks about fertility testing, the focus is mainly on conception i.e. the process of becoming pregnant as this is the area of expertise of fertility specialists and fertility clinics.
There is no single test for fertility because there are so many parts to the process of conception (see above) and there are both male and female factors that contribute to conception.
Fertility testing can include self-testing such as monitoring your menstrual cycle and using ovulation kits to predict when you ovulate. Fertility tests can also include investigations performed by a healthcare professional.
The range and number of tests performed will vary for each person or couple depending on the assessment and any medical conditions.
How is fertility tested and should I have a fertility check before I start trying to conceive?
The table below shows a number of tests that can be done to assess the different processes that occur whilst trying to conceive from development of the egg and sperm through to conception itself.
These tests are performed when couples are having difficulty in conceiving and this is not a comprehensive set of the tests as there are many more that can be performed particularly if you are undergoing IVF. This will be discussed in part 2 of this series.
None of the tests predict the probability of you being able to conceive.
Chances of conception
Couples having sexual intercourse
Here are the general population figures for trying to conceive (taken from NICE guidance):
Over 80% of couples aged below 40 in the general population will conceive within 1 year if they are having regular sexual intercourse (twice a week) and are not using contraception.
Of the 20% that do not conceive in the first year, about half will do so in the second year.
This means that Over 90% of couples will conceive within 2 years.
See table 1 from the national institute of clinical excellence (NICE) guidelines which shows the percentage of couples that have conceived after having sex twice a week in 1 or 2 years against their age (all under 40).
Chances of conception: couples using IUI
Over 50% of women aged under 40 years will conceive within 6 cycles of IUI. Of the 50% that do not conceive, around 25% will conceive with a further 6 cycles of IUI.
Therefore 75% of women will conceive within 12 cycles of IUI.
See table 2 from NICE guidelines which shows the percentage of couples that have conceived in 6-12 cycles of IUI against their age (all under 40).
Do you remember the process of conception I explained above?
It’s a complex process that requires so many parts to work at the right time.
So please be aware that getting pregnant can take time. It can take 1-2 years and even longer if you are over 40. Taking longer to conceive does not necessarily mean there is something wrong with you.
(See section below called 'If it's taking longer to conceive that you hoped it would')
Therefore, when you are just starting to try to get pregnant, have a preconception review with your healthcare professional, introduce lifestyle changes, if required, to optimise your health at least 3-6 months before you start trying to conceive.
Having penetrative vaginal sex (with ejaculation) every 2-3 days should be sufficient to achieve fertilisation assuming that all other factors are aligned.
Using methods to help identify your 'fertile window' i.e. when you are most likely to be ovulating and when your chances of fertilisation are higher are important if you are using artificial insemination to conceive, if you are not having regular sex and want to get pregnant or if you want to try to improve how quickly you get pregnant. If you know when you ovulate then you can inseminate or have sex around a more targeted time.
Any other fertility testing is not required when you initially start trying to conceive, unless you have a condition or predisposing factors that increase the likelihood of fertility problems,
This is because performing all of these fertility tests at the beginning of your conception journey :
1. Is expensive
2. Does not provide valuable information at this stage as you are highly likely to conceive naturally without intervention.
3. Having abnormal tests results before you’ve started the process of trying to conceive can cause unnecessary anxiety.
When is fertility testing done?
The answer to this depends on where you are located and what services are available to you.
Self-testing and monitoring e.g. tracking your menstrual cycle, understanding can be done from the beginning of your conception journey.
If have been tracking your periods then you will already be savvy about your menstrual cycle; however, you will now have a more specific focus on predicting when you will ovulate.
I recommend that anyone planning to start their journey have a preconception review with their practice nurse, GP or gynaecologist depending on what resources are available to you. The sooner you have the review; the better and where possible at the latest 3 months before you start to try to conceive. If you can have the review 6 months beforehand this gives a good amount of time to prepare your body to be healthy for conception.
In England, the preconception review provided by the NHS can be arranged with your Practice nurse or GP. However, fertility testing isn’t offered at this stage.
In England, professional fertility testing is not routinely performed before you start trying to conceive.
If you want to have fertility testing done prior to starting your conception journey you will need to arrange for this to be done privately.
It’s taking longer to conceive than I hoped it would. Shall I get tested?
Your GP or ObGyn will offer you clinical assessment and fertility investigations if you have not become pregnant after:
* 6 months of trying to conceive if you are aged 36 or more OR if you have a known cause of history of predisposing factors for infertility e.g. endometriosis, polycystic ovarian syndrome.
* 12 months if you are 35 years old or younger
Fertility test - NHS
Fertility testing is offered under the NHS if you have not become pregnant within the timeframe mentioned in the previous section.
You GP can do some of the initial tests required and will most likely refer you for further testing at in the fertility clinic by the fertility specialists.
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For more information on the female reproductive system and hormones