Before IVF, blood tests help your fertility team check for infections, assess aspects of reproductive hormone function, and identify health or immunity issues that could affect planning for treatment or pregnancy. Common tests include HIV and hepatitis B and C screening, plus selected hormone tests such as anti-Müllerian hormone (AMH). The exact panel varies with your history, planned treatment, clinic rules, and previous results; not everyone needs every test.
Why are blood tests needed before IVF?
In vitro fertilisation (IVF) involves using medicines to stimulate egg development, collecting eggs, fertilising them in a laboratory, and transferring an embryo into the uterus. Before treatment begins, the fertility team needs information that helps them plan these steps safely and appropriately.
Blood tests can check for certain infections, provide information about ovarian response to fertility medicines, and investigate hormone-related concerns when needed. Some tests are required by local regulations or clinic policies, while others are selected because of a person's medical history, menstrual cycle pattern, previous fertility treatment, or planned IVF procedure.
There is no single blood test panel that applies to every person undergoing IVF. Your fertility clinic should explain which tests are needed, what each one is intended to assess, and whether any previous results can be used.
Which infection screening blood tests are done before IVF?
Infection screening is an important part of preparation for fertility treatment. The NHS guidance on IVF identifies blood tests for the following infections as examples of checks that may be required before treatment:
- HIV: Testing checks for human immunodeficiency virus, which affects the immune system.
- Hepatitis B: Testing checks for infection with a virus that affects the liver.
- Hepatitis C: Testing checks for another virus that can cause liver infection.
These checks help the clinic assess infection-related risks and plan appropriate care. In the United Kingdom, the Human Fertilisation and Embryology Authority (HFEA) explains that people involved in fertility treatment need certain health checks before treatment begins. The exact requirements may differ between countries and treatment programmes, so ask your clinic which people need screening if donor eggs, donor sperm, or a gestational carrier are involved.
If a screening result is positive, the clinic may arrange further assessment and specialist advice before deciding how to proceed. A positive result does not mean you should interpret the situation on your own; the implications and available options depend on the infection, the people involved, and the treatment plan.
Which hormone blood tests may be needed before IVF?
Hormone tests are selected according to the clinical question being investigated. Some help the fertility team understand ovarian function or menstrual patterns, while others may be useful when there is a reason to investigate a possible hormonal problem. They are not all required for every IVF cycle.
Anti-Müllerian hormone (AMH)
AMH is produced by cells in developing ovarian follicles. Its level can help estimate ovarian reserve, which refers to the remaining supply of eggs. Before IVF, AMH is commonly used to help predict how the ovaries may respond to medicines that stimulate egg development.
The National Institute for Health and Care Excellence (NICE) recommends using AMH measurements or antral follicle count from an ultrasound scan to help predict ovarian response and support decisions about assisted conception. These measures help with treatment planning, but they do not provide a guaranteed outcome for an individual IVF cycle.
Follicle-stimulating hormone (FSH) and luteinising hormone (LH)
FSH and LH are hormones involved in reproductive function. Depending on the person's menstrual history and clinical findings, a fertility specialist may order these blood tests to investigate irregular periods or problems with ovulation. They are not a mandatory pair of tests for everyone starting IVF.
FSH results need to be interpreted in the context of the specific reason for testing. NICE does not recommend using FSH as a predictor of ovarian response or the outcome of assisted conception. It is therefore important not to treat an individual FSH result as a stand-alone measure of the likelihood of IVF success.
Estradiol and progesterone
Estradiol is a form of estrogen that can be measured when the clinic needs additional information about reproductive hormone function. In selected cases, it may be measured alongside FSH. When these tests are requested, their timing can matter because hormone levels change during the menstrual cycle.
Progesterone testing may be used to assess whether ovulation has occurred. According to NICE guidance, a blood test may be offered during the middle of the luteal phase, which is the part of the cycle after ovulation. For a 28-day cycle, this is commonly around day 21, but the appropriate timing may be different with longer or irregular cycles.
The American Society for Reproductive Medicine (ASRM) explains that hormone measurements should be selected and interpreted according to the purpose of the fertility evaluation. The results are considered alongside menstrual history, age, previous treatment response, and other findings rather than used in isolation.
Will I need thyroid or prolactin blood tests?
Thyroid-stimulating hormone (TSH) testing may be appropriate when symptoms or medical history suggest a thyroid problem. Thyroid function can be relevant to reproductive health, but current NICE guidance does not recommend routinely testing thyroid function in everyone with fertility concerns when there are no symptoms suggesting thyroid disease.
Prolactin is a hormone involved in milk production and other body functions. A blood test may be considered when there is a specific reason, such as an ovulation disorder, milk-like nipple discharge outside breastfeeding, or a suspected pituitary problem. It is not a standard requirement for every person preparing for IVF.
Additional hormone tests may be considered if the menstrual cycle is irregular or there are other clinical findings that warrant investigation. Your clinician can explain why a particular test is relevant and how its result could influence your care.
Are there any other blood tests before IVF?
Depending on vaccination history and local guidance, a clinic may check whether you have immunity to rubella, also known as German measles. Rubella infection during pregnancy can harm a developing baby. NICE recommends checking rubella status when someone seeking fertility care has not been vaccinated or is unsure of their vaccination history.
If testing shows that you are not immune, your clinician may recommend vaccination before trying to become pregnant. Because some rubella-containing vaccines are not given during pregnancy, vaccination can affect the timing of fertility treatment. Discuss the recommended interval before attempting pregnancy with your healthcare professional.
Other tests may be requested when your medical history or existing health conditions make them relevant. For example, your clinician may review previous blood results or investigate a concern that needs attention before pregnancy. These additional tests are guided by individual circumstances and are not necessarily part of every IVF blood test panel.
Are blood tests the only tests needed before IVF?
No. Blood tests are only one part of the pre-treatment assessment. Depending on the treatment plan and previous investigations, your clinic may also arrange a transvaginal ultrasound to assess the ovaries and uterus, review your medical and reproductive history, or request a semen analysis when sperm will be used.
An ultrasound can provide information that a blood test cannot, including the appearance of the ovaries and the number of small follicles visible at the time of the scan. A semen analysis assesses sperm-related factors. The fertility team combines the relevant results rather than relying on one investigation to plan treatment.
When should IVF blood tests be done?
The correct timing depends on which tests have been ordered. Some blood tests can be taken on any day of the menstrual cycle, whereas others are scheduled for a particular phase of the cycle so their results can be interpreted appropriately.
For example, AMH can generally be measured at any point in the menstrual cycle. Other hormone tests may need to be coordinated with the start of a period or the expected time of ovulation. The ASRM's patient information on ovarian reserve explains the role and timing of common ovarian reserve tests, including AMH, FSH, and estradiol.
Some clinics arrange the required blood work during the initial fertility assessment, while others complete selected tests closer to the planned treatment cycle. Ask whether your results must be recent, particularly if you have had fertility tests before or your treatment has been postponed.
How should you prepare for IVF blood tests?
Most preparation is straightforward, but you should follow the instructions given by your clinic or laboratory. Fasting is not automatically necessary for every fertility blood test, and requirements depend on the tests ordered. Do not fast unnecessarily or change your usual medicines unless your healthcare professional instructs you to do so.
Before your appointment, it may help to:
- Tell the clinic the date your last period began and whether your cycles are regular.
- Provide details of your medicines, supplements, existing health conditions, and previous fertility treatment.
- Bring previous test results if they are available, so the team can decide whether repeat testing is needed.
- Ask whether any tests need to be taken on specific cycle days or whether you need to avoid food or drink beforehand.
Let the clinic know if you have recently travelled abroad, received a vaccination, or had a new medical diagnosis that could affect your assessment. These details can help the team determine whether extra checks or changes to the timing of treatment are appropriate.
What do IVF blood test results mean for treatment?
Your fertility specialist uses the results to answer specific clinical questions, plan treatment, and identify concerns that may need follow-up. For example, ovarian reserve information can help the team anticipate the response to stimulation medicines, while infection screening can identify circumstances requiring further assessment or specialist management.
A result outside the laboratory's expected range does not automatically mean that IVF will fail or that you cannot become pregnant. AMH, in particular, is not a direct measurement of egg quality and cannot determine the outcome of an individual treatment cycle. Age remains an important part of fertility assessment, and a specialist will consider it alongside the test results and your medical history.
If a result is unexpected, ask what the test measures, whether it needs confirmation, and whether it changes the planned treatment. Some findings may require additional investigations, medical care, or a change in timing; others may have little effect on the treatment plan. Your clinic should explain the significance of the result in your particular circumstances.
How can you avoid delays before starting IVF?
Completing the requested tests early, following instructions about cycle timing, and sharing relevant medical information can help the clinic finalise your treatment plan. Ask whether any results are missing, whether previous tests are still acceptable, and whether you need to complete additional screening before medication can begin.
If you have a positive infection screen, are advised to receive a vaccination, or need assessment for a hormone-related concern, ask how this may affect your schedule. The appropriate next step will depend on the finding and your individual care plan. Clarifying these details before treatment starts can help you understand what remains to be completed and why.