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Whether you’re trying to conceive or want to know your own cycle better, understanding your hormones is a must.
You can think of the four main reproductive hormones (LH, FSH, estrogen, and progesterone) as the masterminds behind your cycle. Together, they regulate the important processes of menstruation, ovulation, conception, implantation, and beyond.
(Note: Inito measures the urine metabolites of these 4 fertility hormones: FSH, LH, E3G, and PdG)
Inside this article, you’ll learn more about common FSH trends on Inito. You’ll even get to see what FSH patterns on an Inito chart are telling you!
(And don’t worry, you don’t have to be a medical expert to get this. We’ll break it all down for you chart by chart so it’s easy to comprehend.)
Key Takeaways
- FSH is a reproductive hormone whose main job is to recruit and mature ovarian follicles in preparation for ovulation.
- Here are the most common “textbook” trends for FSH levels during the menstrual cycle:
- Follicular phase: begins to rise to recruit follicles
- Ovulatory phase: sometimes rises again around the time of your LH surge
- Luteal phase: usually stays at baseline for most of the luteal phase, but may begin to rise towards the end
- These “textbook” FSH trends aren’t the end-all, be-all for most cycles. You may experience some variations to these patterns, and in many cases, it’s no cause for concern.
- Try your best not to compare your exact FSH patterns to those of other women. Menstrual cycles and hormones can vary greatly from one person to the next.
- If you have concerns about your FSH patterns, you’re not ovulating, or you’ve been struggling to conceive, it’s a good idea to begin a conversation with your doctor.
What do FSH Trends on Inito Typically Look Like Throughout the Menstrual Cycle?
Below, we explain a series of FSH patterns you may see at different times in your menstrual cycle. If you’re new to learning about FSH, we suggest you read this article first!
As you’ll soon see, there are standard “textbook” scenarios for how FSH works. But there are also variations of those trends.
Keep in mind that your FSH patterns on Inito may not follow the textbook trend exactly. And that doesn’t necessarily mean there’s something wrong with your FSH levels or your fertility!
Know more: New to Inito? Here’s How to Read Your Inito Chart
Follicular Phase: Does FSH Rise at the Beginning of the Menstrual Cycle?
Yes. In your follicular phase, FSH’s key role is to recruit and stimulate the growth of several ovarian follicles. So at this time in your cycle, FSH levels will generally be on the rise.
Just so you know! The FSH levels you see in all the charts below are urine FSH values.
And another thing: to make these examples easier to understand, we’ve recreated the charts using representative hormone patterns. They are not actual user charts.
FSH rising in the follicular phase (“textbook trend”)
Chart 1: show FSH rising at the beginning of the cycle
In the above chart, FSH levels are rising slightly in the first few days. This is the most common pattern for FSH as it marks the start of the follicle recruitment process for that cycle.
One small study found that the FSH rose before CD (cycle day) 2 in 25% of cycles, on CD 2 or 3 in 28% of cycles, and on CD 4 or later in 47% of cycles.
No FSH rise in follicular phase (variation)
Some women may not have a noticeable rise in FSH in the follicular phase, and this can be typical too. Notice in this user’s chart, estrogen rose on CD 9, and then she had her Peak Fertility on CD 13. Then ovulation was confirmed on CD 19.
So even though her FSH pattern didn’t follow the textbook trend to a T, it still led to ovulation.
Now that you’ve seen what FSH patterns look like early on in your cycle, let’s skip ahead to more exciting times: ovulation!
Ovulation: Does FSH Always Surge Around Ovulation?
That depends. For many women, FSH during ovulation will typically spike briefly when LH rises. This is FSH’s way of supporting the final selection of the dominant follicle and aiding its final stage of maturation.
But there are also a few variations.
Remember, these fertility hormones don’t work in isolation. They’re in constant connection with each other. So you can think of FSH running a few steps alongside LH before officially passing on the baton and moving onto the sidelines to take a break.
FSH spikes while LH rises around ovulation (“textbook trend”)
One study found that peak FSH levels coincided with the LH surge in about 53% of cycles. This is the pattern you see in the chart above.
That same study found that in the remaining 47% of cycles, FSH levels surged before LH rose. You can see how that FSH trend plays out in the chart below:
FSH rises higher than LH (variation)
LH typically gets all the attention around ovulation time. But in some cycles, FSH may actually surge even higher than LH. This is not a cause for concern, as evidenced by ovulation being confirmed on CD 22 in the chart below. However, if you feel something is off, you can always consult your doctor.
Know more: What Your FSH & LH Ratio Says About Your Fertility
FSH rises and falls with LH (variation)
For some women, FSH and LH seem to work in tandem. This is the pattern that you see in the chart below where FSH rises and falls with LH on CD 23 and 26.
No FSH rise mid-cycle (variation)
Not all cycles will see a rise in FSH around ovulation time. One study found that this can be normal and that a mid-cycle FSH surge may not truly be necessary for ovulation to occur.
In the chart below, you’ll notice that FSH levels remained more or less at baseline levels during the follicular phase, and there was no surge around ovulation day.
However, this user still ovulated, as confirmed by a rise in their PdG on CD 20. So, if you were wondering “Can you ovulate without an FSH surge?”, you can be rest assured.
Once you ovulate, you enter the luteal phase. Keep reading to see what FSH is up to during this final phase of the menstrual cycle.
Luteal Phase: What Happens to FSH After Ovulation?
In most cycles, FSH will stay low throughout the luteal phase (the time between ovulation and your next period). Then, once your new cycle begins, it will begin to rise and recruit follicles again.
FSH stays low in luteal phase (“textbook trend”)
In this first chart, you can see that the user’s FSH is hovering around baseline levels post-ovulation through their next cycle.
FSH rising with LH in luteal phase (variation)
For some, FSH may rise alongside LH during the luteal phase. This extra boost of LH and FSH may help support the functioning of the corpus luteum. The corpus luteum is vital for progesterone and estrogen production as your uterus prepares to support a pregnancy.
You can see this brief FSH rise on CD 33 in the chart below.
FSH rising at end of luteal phase (variation)
Another pattern you may notice with your FSH is that it begins to rise at the end of your luteal phase. One study found that women experience their initial rise in FSH about 4 days before their period. This rise seems to coincide with when estrogen begins to drop significantly.
You can see this end-of-cycle FSH rise in the chart below. FSH is already preparing for its work of recruiting follicles in the next cycle.
Disclaimer: An increase in FSH late in the luteal phase doesn’t necessarily mean your period is about to begin. Hormone patterns can vary from cycle to cycle, and Inito can’t be used to predict or rule out pregnancy. Use a pregnancy test to confirm pregnancy, and remember—you’re not out until you’re out.
As you can see from all the charts above, FSH trends can vary a good amount. But in case you’re worried about how your FSH levels compare to the patterns you’ve seen here, let’s take a look at why your chart may be different.
Why do FSH Trends on Inito Look Different From Cycle to Cycle?
TL;DR: Your hormones are pretty dynamic!
In fact, it’s almost like your menstrual cycle and your hormones have a life of their own.
For one, what’s considered a “normal” cycle length ranges from 21 days to 35 days. That leaves a decent amount of variation in the exact timing of hormonal fluctuations.
This is because hormones are naturally released in pulses, so their levels can fluctuate from day to day—and even hour to hour. FSH, for example, has a half-life of about 3–4 hours, so while it’s more stable than some hormones, a single measurement still captures just one moment in time.
On top of that, hormones are very sensitive to lifestyle practices. That means your sleep, diet, exercise, and other daily activities can make your cycle operate differently from other women. And when you make changes to your normal lifestyle habits, your hormones can also look different from one cycle to another.
Here’s how some of these factors may affect FSH levels:
Factor | Effect on FSH |
Sleep | Researchers found that FSH was about 20% lower among women who are short sleepers compared to those who slept for more than 8 hours/night |
Stress | High daily recent stress was associated with 6.2% higher FSH levels |
Diet | Diet can indirectly impact FSH levels by influencing the hypothalamic-pituitary-ovarian (HPO) axis. A severe calorie deficit can suppress the HPO axis, while obesity can alter estrogen and leptin signaling, which negatively impacts FSH. |
Exercise | The relationship between exercise and fertility hormones is nuanced. In general, regular exercise in moderation helps overall hormonal balance and ovulation. |
This is the case with the user below.
You can see that their FSH pattern changes from the first cycle shown to the second cycle shown.
In the first chart, the user’s FSH stayed around baseline levels throughout the cycle. In their second cycle, we see that FSH rose slightly in the beginning of the cycle to support follicle growth, rose along with LH around ovulation, and showed slight fluctuations post-ovulation as well.
In spite of those differences, they still experienced ovulation in both cycles (CD 15 in both cases).
Know more: Why Does My Period Date Change Every Month?
So what’s the bottom line here?
When it comes to your FSH levels, try not to get too into the nitty-gritty numbers. Your overall trends are more important to look at than any single hormone value in a given cycle.
And if you’re ovulating each cycle, that’s a great indication that your menstrual cycle is in good shape!
But if you think there’s something off with your FSH levels or you notice changes to your usual hormone trends, it may be a good idea to seek expert guidance.
See the next section for some red flags that may tell you it’s time to talk to your doctor!
When to See a Doctor About Your FSH Levels?
Here are some reasons that warrant talking to your doctor about your FSH and other hormones:
- You have more than two anovulatory cycles in a row
- You have concerning symptoms like heavy bleeding, irregular or absent periods, or extremely painful periods
- You’ve been trying to conceive for a year with no luck (or 6 months if you’re over 35)
- You feel that your FSH levels seem risen for most of your cycle
It can be worrisome and overwhelming when your hormones are out of whack. But try not to jump too quickly to conclusions.
Gather the information you’ve been tracking on your cycle. That can help your doctor in determining what additional testing may be necessary to see what’s going on.
And if there is some sort of underlying issue present, chances are that a lifestyle change or some sort of medical intervention will be able to help you!
Conclusion
FSH plays an important role in preparing the ovaries for ovulation, but its pattern is not identical in every cycle or every person. Some people experience a clear rise at the start of the cycle or around ovulation, while others have more subtle changes and still ovulate normally.
Instead of focusing on a single FSH value, it’s often more helpful to look at hormone trends across the entire cycle and in the context of other hormones. Tracking these patterns over multiple cycles can provide a better understanding of what’s typical for your body.
If your FSH pattern looks different from the examples shown here, remember that variation is common. However, if you feel that your hormone patterns look unusual, experience multiple cycles without ovulation, or have concerns while trying to conceive, consider discussing your results with a healthcare provider.
FAQs
Many cycles show an FSH rise early in the follicular phase, an FSH spike around ovulation, and relatively low levels during the luteal phase. However, there is considerable natural variation.
Not always. Some people have a clear FSH increase before or alongside the LH surge, while others don’t notice any increase and still ovulate.
Yes. Research suggests that some ovulatory cycles do not have a pronounced FSH surge, so its absence does not necessarily mean ovulation did not occur.
FSH patterns can vary because of differences in follicle recruitment, cycle length, and normal hormonal fluctuations, and lifestyle factors like diet, stress, sleep, etc. Even consecutive ovulatory cycles may not look identical.
Yes. After ovulation, FSH typically remains relatively low during the luteal phase before beginning to rise again as the next cycle approaches. However, FSH may occasionally spike to help boost corpus luteum function or in preparation for the next cycle.
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- The onset of the initial rise in follicle-stimulating hormone during the human menstrual cycle – PubMed
- Characterization of follicle stimulating hormone profiles in normal ovulating women
- The onset of the initial rise in follicle-stimulating hormone during the human menstrual cycle – Oxford Academic
- Characteristics of the urinary luteinizing hormone surge in young ovulatory women – Science Direct
- Sleep, Sleep Disturbance and Fertility in Women – PMC
- Perceived stress, reproductive hormones, and ovulatory function: a prospective cohort study – PMC
- The impact of food and nutraceuticals on human fertility – ScienceDirect
- The effect of physical activity on fertility: a mini-review – PMC
