Going through the beginning stages of IVF can feel overwhelming when you are confronted with new medical terminology. Despite the confusing nature of terms like FSH, LH, estradiol, and progesterone, these hormones are critical in understanding your reproductive system and what may be impacting it.
Before IVF, your fertility specialist may recommend some blood tests to assess your ovarian function, your body’s response to fertility medications, and your potential to ovulate. Each of these hormones serves a different role to your doctor and together they are akin to each light on your car’s dashboard.
Results can be crucial in helping you feel comfortable about the next steps.
Hormone tests before IVF, including FSH, LH, estradiol, and progesterone, help assess ovarian function, ovulation, and treatment planning with guidance from the best IVF Doctor in Delhi NCR
1. Why Are Hormone Tests Done Before IVF?
IVF Treatment is not a “one size fits all” solution and your specialist must have an entire picture of your menstrual cycle, ovarian function, and your reproductive health to determine the appropriate course of action.
FSH and estradiol can help measure ovarian reserve and follicular development. Testing progesterone can help assess whether ovulation occurred.
These tests can help your doctor:
- Determine whether your ovaries are responding normally
- Assess if your menstrual cycle is functioning normally and whether your body is ovulating
- Help decide if other forms of testing are warranted
- Help develop your IVF treatment plan
Hormone results always need to be assessed in the broader short and long term impacts of your age, health history, and other tests that are done for you.
2. What Is FSH and Why Is It Tested?
FSH is short for follicle-stimulating hormone, and it is key to developing the follicles in the ovary during the sinusoidal phase of the menstrual cycle.
You can think of FSH as a messenger that tells the ovaries to send growing follicles.
It is usually tested during the early part of the cycle along with the other hormones prior to the actual IVF.
The earliest FSH levels during a cycle can be indicative of diminished ovarian reserve. Since FSH numbers can fluctuate throughout a menstrual cycle, a single number cannot be interpreted in a vacuum.
What Does a High FSH Level Mean?
Elevated early-cycle FSH is associated with diminished ovarian reserve.
Higher FSH for a given IVF cycle does not predict a failure of IVF.
FSH is just one of the many components of a fertility evaluation, and the other components should be assessed in conjunction with FSH. The American Society for Reproductive Medicine has noted that AFC and AMH are more sensitive than Basal FSH.
Low FSH
FSH at baseline as well as during the IVF stimulation phase is reassuring when considering multiple components of the evaluation. FSH is important as a starting point, but it is not indicative of ovarian reserve.
3. What Does LH Mean Before IVF?
LH is for luteinizing hormone, like FSH, it too is secreted from the pituitary gland.
In a natural menstrual cycle, luteinizing hormone (LH) plays an important role in ovulation by causing an LH surge. During the early and late stages of fertility treatment, LH helps doctors track the changes that occur in the cycle.
Why LH in IVF?
In an assisted reproductive procedure like in vitro fertilization (IVF), your fertility team is concerned about the development of the follicles and utilizes medications to address this. In this context, the response of the ovaries is of great interest to your doctors and is assessable through the levels of the hormones present.
LH is of value to address irregular ovulation.
Women with polycystic ovary syndrome (PCOS) exhibit certain changes in LH. Hormone levels are not sufficient to provide a diagnosis. Rather, these levels are interpreted along with the patient’s history of menstruation, her symptoms, and her ultrasound images.
LH and Ovulation
LH surges are detectable in the urine. Generally, the LH surge happens one to two days prior to ovulation. LH surges out of IVF are additional reasons LH testing is performed.
LH along with Other Markers of Reproductive Function
LH may be interpreted alongside other reproductive hormones and clinical findings to provide a more complete understanding of ovulatory function.
4. What Is Estradiol (E2)?
During the reproductive years, estradiol (E2) is the most abundant form of estrogen. It is produced by the growing ovarian follicles.
Why Does This Matter in IVF?
Estradiol is secreted by the growing follicles. This indicates the activity of the follicles and the response of the ovary to the stimulation.
Why FSH and Estradiol Together?
In most cases, FSH and E2 are evaluated together.
Early spikes in estradiol can lead to a suppression of FSH, meaning an elevated FSH could read as a normal FSH level. ASRM states that an elevated early-cycle estradiol level can provide additional context when FSH is being assessed.
This illustrates that looking at even one number in isolation can be deceiving.
Your doctor will take into account:
- FSH
- Estradiol
- AMH
- Antral follicle count
- Age
- Menstrual history
- Previous IVF response
to come to a more informed conclusion.
5. Why Is Progesterone Tested?
After ovulation, progesterone is the hormone of focus.
As the follicle releases the egg, it transforms into the corpus luteum.
The corpus luteum then produces progesterone and prepares the uterus for possible implantation.
What Does a Progesterone Test Tell You?
A progesterone blood test can tell if ovulation has occurred.
The Window of Time Matters
Rather than testing on the “day 21,” ASRM states that for ovulation assessment the blood test should be done one week before the expected start of the next menstrual cycle.
A progesterone level above approximately 3 ng/mL can indicate that ovulation has occurred, though the interpretation is dependent on the clinical context and timing.
Can Progesterone Predict IVF Success?
Not by itself.
Progesterone levels can be unpredictable. For this reason, one test cannot determine the quality of the luteal phase and cannot predict the outcome of an IVF treatment.
6. When Should These Hormone Tests Be Done?
Timing is particular to the purpose of the test.
FSH and Estradiol
These are widely measured during the early follicular phase (days 2-4).
LH
LH can be assessed at different points in time relative to your doctor’s order. It could promote the evaluation of reproductive hormone patterns, or it could evaluate the progress of a treatment cycle.
Progesterone
If progesterone is used to validate ovulation, testing is typically done one week prior to the anticipated menstrual period, rather than day 21.
Your fertility specialist may use a different schedule during an IVF cycle because treatment medications disrupt the natural hormonal pattern.
You must never change the timing of a hormone test based on information found online. Always follow your fertility clinic’s instructions.
7. What Do High or Low Hormone Levels Mean?
The single greatest mistake a patient can make is to look at a lab result and to Google immediately if the number is “normal.”
The answer is almost always more complex.
Factors beyond your control which can impact hormone levels may be:
- Age
- Menstrual cycle day
- Medications
- Ovarian reserve
- PCOS
- Recent hormonal contraception
- Pregnancy-related hormonal changes
- Lab testing methods
For instance, FSH can fluctuate significantly from one menstrual cycle to the next. The level of Estradiol can also impact how FSH should be evaluated.
Thus, we can safely conclude that a hormone value can never be evaluated in isolation.
Does an Abnormal Result Mean IVF Cannot Work?
Absolutely not. An abnormal result may just indicate that your case needs to be reviewed and possibly revised. It does not mean you cannot get pregnant.
Your fertility specialist may advise additional diagnostics or a different type of stimulation depending on your complete clinical situation.
8. How Hormone Tests Work Together
Let’s say you want to figure out the problem with your car. Would you just look at the fuel gauge?
Probably not.
You would check the engine, oil, battery, and other indicators.
Fertility assessment works in a similar way.
| Hormone/Test | What It Helps Assess |
|---|---|
| FSH | Ovarian response and a marker associated with ovarian reserve |
| LH | Ovulatory signaling and reproductive hormone patterns |
| Estradiol (E2) | Follicular activity and interpretation of early-cycle hormone patterns |
| Progesterone | Evidence of recent ovulation |
| AMH | Ovarian reserve and expected ovarian response |
| AFC | Number of visible antral follicles on ultrasound |
The ASRM notes that ovarian reserve markers are useful in predicting ovarian response to stimulation and the number of eggs that can be yielded during stimulation. However, they do not provide reliable information on reproductive potential or the likelihood of live birth.
Understanding this difference can alleviate anxiety.
9. Other Tests Commonly Recommended Before IVF
Hormone testing is just one component of an IVF evaluation.
Depending on your medical history, your doctor may order additional tests.
The AMH Test
Anti-Müllerian hormone (AMH) is broadly used in clinical practice to assess ovarian reserve. Compared to basal FSH, AMH can be assessed and measured at different times during the menstrual cycle and is a more sensitive ovarian reserve marker.
Antral Follicle Count
Antral follicle count is defined by the measurement of small follicles in the ovaries. AMH and AFC are among the most useful markers to assess ovarian response to stimulation.
Thyroid Function Tests
Thyroid issues can affect your reproductive system, so we may perform thyroid function tests when appropriate, as part of your fertility workup.
Prolactin Testing
We may request prolactin tests for some patients, since elevated prolactin levels can interfere with your ability to ovulate.
Ultrasound
Both pelvic and transvaginal ultrasounds can help your doctor assess the size and number of your ovarian follicles and, in some cases, can indicate the presence of other conditions that may impact your ability to conceive.
Depending on your individual situation, a fertility workup may involve several blood and ultrasound tests, as well as other tests, beyond what is listed here.
10. Can Hormone Levels Predict Success with IVF?
One of your most common concerns is, “Can hormone levels predict IVF success?” The answer is a firm “no”.
To illustrate this, consider ovarian reserve testing. Hormone levels can give your doctor a prediction of the number of eggs you may be able to produce in one cycle of IVF. Ovarian reserve hormones do not give any predictive value for the outcome of the IVF cycle, pregnancy, or live birth.
Of course, your age impacts your reproductive system the most.
So if your FSH or AMH levels are suboptimal, you should not assume that an IVF cycle will be unsuccessful.
Your doctor will review the entirety of your history.
11. What May Impact Hormone Test Levels?
Hormone levels are not static and will fluctuate. Many factors will impact levels.
Timing of Your Menstrual Cycle
The same hormone throughout your menstrual cycle will have different expected levels.
Hormonal Medications
Birth control pills can change the levels of the hormones measured in a blood test. The ASRM says that hormonal contraceptives can lower a patient’s level of AMH, and therefore, it advises that care must be taken in the interpretation of the test when this contraceptive option is used.
Age
There is an overall decline in the ovarian reserve as a woman ages. Simultaneously, the hormonal changes within the body can also be observed.
PCOS and Similar Conditions
Disruptions in ovulation can impact the levels of various hormones.
Laboratory Differences
Different testing methodologies and different reference ranges can lead to different outcomes, even when performing the same test at different labs.
It is important to speak to your fertility specialist about your report and not interpret a number, or a couple numbers, on your own.
12. How Your IVF Doctor Uses the Results
After the results are obtained, the doctor combines the results of the blood test with the ultrasound and the patient’s history in order to determine the patient’s personalized course of treatment.
The results help the doctor determine:
- Which option of stimulation will work best
- Whether there is a need to control the patient more thoroughly
- The probable reaction of the ovaries to the treatment
- If further testing is warranted
- The overall response to treatment during the IVF process
This is why selecting an experienced fertility specialist makes a difference.
If you want the Best IVF Doctor in Delhi NCR, consider qualifications, experience, the clinic and lab facilities, the approach and communication, the results explanation, and whether the doctor is a good person.
A good fertility consultation is not just about the numbers. Understanding what your results mean is what you should be learning during the consultation.
13. When Should You Visit an IVF Clinic?
When you’re unable to conceive after trying for a while, usually 6-12 months, depending on your age, an evaluation for infertility may be justified.
Prolonged evaluation is recommended by ACOG for women younger than 35 years old after 12 months of trying, women aged 35 or older after 6 months of trying, and women aged 40 or older should be evaluated by their OB/GYN.
Earlier evaluation is justified for individuals with known fertility concerns, irregular periods, prior pelvic conditions, and recurrent pregnancy loss especially if there are other pertinent medical issues.
Early evaluation allows potential IVF patients to gain a better understanding on the diagnostic tests they will need and how their results will impact their treatment.
14. Frequently Asked Questions
1. Are FSH, LH, Estradiol, and Progesterone always all done before IVF?
Not necessarily. Your doctor will make a decision on which of the above tests are necessary depending on your age, history of menses, history of any fertility concerns and/or treatment, and clinical findings.
2. What is the correct day for FSH level?
FSH is usually tested in the early follicular phase, which can be anywhere between days 2-4. It can vary depending on the clinic.
3. What does Progesterone do prior to an IVF?
Progesterone can be an indicator that ovulation has occurred, but this is only the case if it’s done at the proper time. According to the ASRM standards, it should be done about one week prior to the presumed date of her period, rather than doing it on cycle day 21.
4. Does high FSH mean I cannot get pregnant through IVF?
No. A high FSH means there is a reduced ovarian reserve, but that doesn’t necessarily mean IVF won’t be successful. Your doctor must take age, AMH, AFC, previous response to stimulation, and a number of other parameters into consideration.
5. Which is more important, FSH or AMH for IVF?
AMH is a more sensitive marker of ovarian reserve as compared to basal FSH. AFC is also an essential parameter. At the very best, they can be used in combination and have a limited ability to predict the outcome of IVF.
15. Conclusion
Although measuring some hormones before beginning an IVF cycle can give you a case of numbers overload, each hormone has its role in this process. FSH is an ovarian and follicular stimulating hormone, and LH is a hormone responsible for the signaling for ovulation. Estradiol is a hormone produced by the follicles, and progesterone can confirm whether you’ve ovulated.
You must remember one should not be judged or assessed for their fertility by a single number. That value must be assessed in combination with age, ovarian reserve, ultrasound, medical history, and your goals for your reproductive wealth.