Can You Be in Perimenopause With Regular Periods or Normal Labs?

The short answer

Yes. Perimenopause can come when your periods are still coming normally, and one normal hormone result does not decide the diagnosis.

Perimenopause is primarily a clinical diagnosis. That means I listen to the pattern of symptoms you are experiencing, not just one number or whether your cycle has already changed.

Menopause and perimenopause are not diagnosed the same way

Menopause is pretty easy to diagnose in the sense that it is a year after you have not had a period. We wait 12 months after that last period, as long as it was not induced by a hysterectomy or other surgical means. With a naturally occurring 12 months without a menstrual cycle, we can officially say you are in menopause, considering all other things are normal.

Perimenopause is a little bit trickier to diagnose because it is primarily a clinical diagnosis. I think this is one of the most important shifts in recent data and research: perimenopause is a diagnosis that a clinician can make regardless of lab work and regardless of period status.

Your periods may still look normal

We do often see periods getting irregular or changing in duration or flow. But that is not always the case.

Perimenopause can come when your periods are coming just like normal, but you are having a wide variety of symptoms that we associate with perimenopause. Those symptoms are primarily driven by wide hormone fluctuations.

The average age of menopause in the United States is 51 to 52. Perimenopause typically begins four to eight years earlier. I will say anecdotally that I am seeing women much earlier in my clinic, in their mid-to-late 30s. That is anecdotal. The data still shows that the average is probably in the mid-40s.

Why one normal lab result may not settle the question

There is still a common misconception in the medical field that the labs have to match up with the symptoms. That is just not true. Recent evidence shows that this is not how we should be diagnosing these patients.

For women over 45 who present with perimenopausal symptoms, routine hormone tests that we defaulted to in the past—FSH, LH, and estradiol—are not recommended as the diagnostic criteria.

Certainly, we can do them if a patient wants. You have every right to ask for whatever lab you want. But those results do not provide the diagnostic credibility or criteria for us.

The big reason is that those hormone levels fluctuate like roller coasters during the day and during perimenopause in general. You could have normal levels one day and completely off-range levels the next. You could be high or low depending on the day. They are impossible to track in the same way as a fasting lab.

What decides the diagnosis

Perimenopause is not based on one lab or one number. I cannot look at your estrogen and say, “You are in perimenopause.” If you tell me your series of symptoms, regardless of your labs, that is how the diagnosis comes.

There are great treatments for it, but HRT is not one size fits all. People respond differently, and that is where having a physician who understands the options becomes very important.