Understanding Hormone Testing: Why the Method Matters

There isn’t just one way to measure hormones. In fact, there are three primary methods: blood (serum), saliva, and urine. Each one offers a different lens into what’s happening inside the body—and each has its strengths and limitations.

When we talk about hormones, how we test them matters just as much as what we test. Let’s walk through them in a way that actually makes sense.

Serum Testing (Blood Work)

This is the standard approach you’ll experience in conventional medicine.

It’s simple, familiar, and widely used. A blood draw is taken, and your hormone levels are measured at that moment in time.

Where serum testing shines:
Blood testing is excellent for certain types of hormones, especially those involved in signaling and regulation, such as:

• Thyroid hormones

• Insulin

• FSH and LH

• Prolactin

• SHBG (sex hormone binding globulin)

These markers help give a broad picture of how your endocrine system is functioning. An important point most people are never told is that when hormones circulate in the blood, most are actually bound to proteins, making them unavailable for use in the body. 

Only a small portion of the hormone levels are “free” that can move into your tissues, interact with receptors, and actually do their job. You can kind of think of your hormones like money. Some of your money is locked away in a savings account—you can see it, but not readily available. That’s your bound hormone. Then there’s the money in your wallet—the cash available to actually spend. That’s your free hormone. Blood testing often tells us how much money you have in total. But what really matters is how much you can actually use.

Urine and saliva testing give us a better picture of that “cash in hand”—the hormone that’s active, available, and doing work in your body. So while blood levels can look “normal” on paper…you may not have enough free, active hormone reaching your tissues. In addition, blood serum levels reflect only a single moment in time, which can be limiting—especially for women whose hormones fluctuate daily and throughout their cycles.

Saliva Testing

Saliva testing became popular in the functional medicine world because it offers a more dynamic view of hormones. It’s non-invasive and can be done at home, which makes it more accessible.

Saliva reflects the free, bioavailable portion of hormones—the same fraction that is active in the body. This gives us a better sense of what your body can actually use, rather than just what is present. It also allows for multiple collections throughout the day, unlike serum, which can be helpful for tracking cortisol patterns, understanding daily rhythms and looking at shifts across the menstrual cycle. 

Saliva testing can have limitations, as it’s sensitive to external factors such as food, drink, and oral hygiene. It also doesn’t show us how hormones are being metabolized, which is a key missing piece, especially for estrogen and detoxification pathways. Furthermore, if someone is using hormone therapy, results can be skewed unless those hormones are paused.

Urine Testing

Urine testing offers one of the most comprehensive views of hormone health—especially when we’re looking beyond just levels. This is where things can come full circle:

The free (unbound) hormones—the same ones that are active in your tissues—are also the ones that eventually make their way into urine. So when we measure hormones in urine, we’re getting a reflection of what is bioavailable in the body (what your body can actually use) and how those hormones are processed and broken down. This is why urine testing often correlates more closely with symptoms.

There is a strong correlation between serum and urinary hormone levels for sex hormones, but urine provides more context, especially regarding metabolism. There is also a hormone that works a little differently but is extremely important: cortisol. Cortisol is more water-soluble, which means it passes into urine more readily.

So when we measure cortisol in urine, we are specifically looking at free, bioavailable cortisol—the form your body is actively using. And because urine testing can be done at multiple points throughout the day, we can see your true daily cortisol rhythm, rather than relying on a single snapshot.

This is incredibly important when assessing:

• Stress patterns

• Burnout or “wired and tired” states

• Nervous system regulation

And what makes urine testing especially useful is that it doesn’t just tell us how much hormone is present—it shows us how your body is using it because its showing us Estrogen metabolism pathways (protective vs. more inflammatory), Adrenal function patterns, Melatonin, and sleep-related hormones, and overall hormone balance and flow.

Hormone health isn’t just about how much you have. It’s about how much is available, how well your body uses it, and how effectively it’s processed and cleared. You can have “normal” labs and still feel completely off. When we start looking at hormones through this more complete lens, things begin to make more sense.

Why I like DUTCH Testing

This is where I feel DUTCH testing bridges the gap. It combines the strengths of urine testing with detailed insight into hormone metabolism and daily patterns—giving us a much more complete picture of what’s really going on.

It doesn’t just look at your hormones—it looks at what your body is doing with them. It goes beyond “levels”, meaning most hormone tests tell us how much of a hormone is present. The DUTCH testing goes a step further by showing how much hormone you’re making, how much is available for use, and how your body is breaking them down and clearing them. This breakdown process matters more than most people realize, because you can have “normal” hormone levels, but if your body isn’t processing them well, you can still experience symptoms.

Remember how we talked about free (active) hormones? DUTCH testing captures that—but it also looks at what happens after your body uses those hormones. These are called metabolites (you can think of them as the “end products” after your body has done its work). This gives us insight into whether estrogen is being processed in a supportive way, or being pushed down pathways that can contribute to symptoms, a piece that blood and saliva testing simply don’t show.

It’s Non-Invasive and Easy to Do at Home

No blood draw. No lab visit. Need I say more? DUTCH uses dried urine samples collected at home throughout the day. It’s simple, practical, and still gives us a very detailed picture of what’s happening inside your body. It will also show the full hormone, not just a snapshot. This helps us see patterns so that we can understand. This is especially important in midlife, when hormones are shifting—not static.

Can Map Your Hormones Across Your Cycle

For women who are still cycling, there’s an option to track hormones across the entire month.

This allows us to see how estrogen and progesterone rise and fall, where imbalances may be happening and why certain symptoms show up at specific times. This can be incredibly helpful for things like PMS, irregular cycles, PCOS, and estrogen dominance patterns.

Gives Insight Into Stress and Sleep Patterns

This is my favorite thing about DUTCH: it also looks at cortisol (your stress hormone) throughout the day. This is incredibly valuable information, and it's not just about how much you have, but how it’s rising and falling. This helps us understand patterns like feeling wired at night but exhausted in the morning, midday crashes, and chronic stress or metabolic burnout. We can also measure melatonin, giving insight into your sleep-wake rhythm.

Looks at the Bigger Picture of Your Health

Another powerful feature is the inclusion of something called organic acids. You don’t need to get caught up in the term—what matters is what they tell us. These markers give clues about our nutrient needs, detoxification pathways, gut health, energy production, inflammation, and oxidative stress. So instead of looking at hormones in isolation, we start to see the whole system.

Helps Create a Truly Personalized Plan

Because this test is so detailed, it allows us to move away from guessing. We can tailor support based on what your body actually needs, whether that includes: targeted nutrition, nervous system support, lifestyle shifts, or hormone support when appropriate. This is where testing becomes not just informative—but actionable.

You are not a set of numbers on a lab report. Your symptoms are real. Your experience matters. And when we look deeper—at how your body is functioning, not just what’s “in range”—we can begin to connect the dots in a way that finally makes sense. 

If you would like to explore how we can connect the dots and/or are interested in DUTCH testing, please reach out to book your free consultation. I look forward to speaking with you soon!

IN Wellness, 

Tess, RN, FDN-P, Clinical Herbalist

CURIOUS ABOUT BHRT? READ Why Hormone Testing Matters Before Starting BHRT (It’s Not Optional)