By Dr. Shiv Kumar Goel, MD · Medically reviewed October 2026
She brought the printout with her, folded into quarters, and set it on the desk before she sat down. Call her Whitney. She’s a composite drawn from the women who bring me this exact printout most weeks, not one patient. FSH, estradiol, TSH, all inside range. Her primary care doctor had told her the labs looked fine and asked if she’d considered that she might be depressed. She was forty-eight. She hadn’t slept through a night in four months. She was crying in the parking lot before client calls and couldn’t say why. She wanted to know if she was making it up.
Not making it up. The labs are telling the truth. They’re just answering a question nobody actually asked.
Why one blood test misses perimenopause
A single blood draw measures hormone levels at one moment on one day. Perimenopause isn’t one moment. It’s a stretch of years, often four to eight, where the ovaries are winding down unevenly instead of on a schedule, and the hormones behind that process swing widely from week to week and sometimes day to day. A study that tracked daily hormone levels in women at midlife found exactly this: measured against a single snapshot, the actual pattern showed significant variability that “single hormone value comparisons” simply cannot see (Meyer et al., Am J Epidemiol, 2007). Draw blood on a low day and the paperwork says normal. Draw it a week later, mid-swing, and it might say something else entirely. Whitney’s labs weren’t wrong. They were a photograph of one Tuesday.
What the research actually shows
What actually tracks with symptoms isn’t a single number. It’s the pattern over time. A longitudinal study following more than three thousand women through the transition found that higher FSH, measured year after year, tracked with how often hot flashes and night sweats showed up (Randolph et al., J Clin Endocrinol Metab, 2005). Not a threshold crossed on one test. A trend, watched across several draws.
And even that doesn’t explain everything, which is worth saying honestly rather than glossing over. The same research group, working within the SWAN cohort, looked specifically at whether hormone patterns explained mood symptoms the way they explained hot flashes. They found a real hormone signature behind vasomotor symptoms, hot flashes and night sweats, tied to falling progesterone and an unstable LH pattern. For mood, no hormone pattern in that data reached significance at all (McConnell et al., Maturitas, 2021). That’s not the same as saying mood symptoms aren’t hormonal. It’s the honest limit of what current hormone testing, even done well, can show. Some of what a woman feels in this transition doesn’t show up as a number anywhere yet.
None of that makes it less real. It makes the standard workup (one draw, three hormones, a normal box checked) the wrong tool for the question she’s actually asking, which isn’t “are my hormones abnormal today.” It’s “why do I feel like a different person than I did three years ago.”
Whitney’s symptom list, when I finally asked her to write it all down instead of leading with the one that embarrassed her least, ran longer than she expected. Sleep that broke at 3 a.m. most nights. Joint pain in both knees that hadn’t been there at forty-five. A memory for names that used to be reliable and now wasn’t. Periods that had gone from clockwork to unpredictable over eighteen months. Irritability she didn’t recognize as herself. None of that is unusual for this stretch of the transition. It’s the common cluster, not a strange one. And none of it required an abnormal FSH to be legitimate.
Why this keeps happening
Part of why this keeps happening in primary care isn’t carelessness. A ten-minute visit built around one lab panel was never designed to catch a moving target. The tool matches a different job: a thyroid nodule, a strep culture, something with one clean answer sitting at one clean moment. Perimenopause doesn’t hold still long enough for that tool to see it, and a doctor working from that tool isn’t wrong to trust it. It’s just the wrong tool for this particular question.
How I test instead
What I do differently with a patient like Whitney: we track rather than snapshot. Two to three draws across a cycle, or across several weeks if cycles have already gone irregular, timed against a symptom log she keeps on her phone: sleep, hot flashes, mood, the days that felt unbearable and the days that didn’t. That pattern, laid against the hormone trend rather than a single cutoff, tells us more than any one lab value could. We also don’t stop at the reproductive hormones. Thyroid, cortisol rhythm, and iron all shift in this decade too, and a symptom that looks purely hormonal sometimes isn’t.
Whitney’s second round of labs, drawn three weeks apart, told a different story than the first. Her estradiol had swung by more than half between the two draws. Nothing was wrong with her. Something was in motion, and one photograph had never been enough to show it moving.
What we did with that information wasn’t dramatic. We didn’t start with a prescription. We started with the sleep, because almost nothing else improves while sleep is broken most nights, and with her thyroid and iron, both of which turned out to need attention of their own. Hormone therapy came into the conversation later, once we could see the actual pattern instead of guessing from one number. And it’s a conversation, not a default, because what helps one woman in this transition doesn’t automatically help the next one.
She wasn’t imagining the parking lot. The paperwork just hadn’t been asked the right question yet.
Questions patients ask me
Can perimenopause labs be normal even when I have symptoms?
Yes. Hormones swing widely from week to week in perimenopause, so a single blood draw can land on a normal day. A normal result doesn’t mean your symptoms aren’t real.
How do you test hormones in perimenopause?
I track instead of taking one snapshot: two or three draws across a cycle or several weeks, timed against a symptom log. I also check thyroid, cortisol rhythm and iron, since they shift in this decade too.
Is hormone therapy the first step?
Not usually. I start with sleep and anything else the labs turn up, like thyroid or iron. Hormone therapy comes into the conversation once we can see the actual pattern, and it’s a decision we make together.
Related reading: My testosterone is normal, so why do I still feel low? and What happens when you stop semaglutide or tirzepatide.
If your labs keep coming back normal and you still don’t feel like yourself, you can book a visit here.
About the author. Dr. Shiv Kumar Goel, MD, is an internal medicine physician trained at Mount Sinai and the founder and medical director of Prime Vitality Care in San Antonio. He has practiced medicine for 25 years, served as an assistant professor of internal medicine at Texas Tech University Health Sciences Center, and is certified in functional medicine by the American Academy of Procedural Medicine. His writing appears in KevinMD, Doximity Op-Med, San Antonio Medicine, and the San Antonio Express-News. Read his full bio →
The patient described is a composite drawn from patterns seen across many women, not a single individual. This article is for education and isn’t a substitute for care from your own physician.
