The hormone workup: choosing between serum and DUTCH
The most common hormone testing mistakes in integrative practice are not about ordering the wrong panel. They are about ordering the wrong kind of test for the question you are actually asking. The skill is matching the test to the clinical question in front of you, and serum and DUTCH each answer different questions well.
The decision tree
The choice comes down to what you are actually trying to learn.
Reach for serum when the question is about quantity, diagnosis, or safety
Use serum when you want to know whether the patient has enough hormone, whether a specific diagnosis is present, whether your prescription is producing the expected circulating level, or whether treatment is safe.
Serum answers:
- Do they have enough?
- Is this condition present?
- Is my dose landing where I expect?
- Is this safe to continue?
For those questions, serum is the right tool, read against functional optimal ranges, estradiol, progesterone, testosterone total and free, DHEA-S, FSH and LH, and SHBG timed to the cycle when it matters.
Reach for DUTCH when the question is about metabolism, clearance, or persistent symptoms
Use DUTCH when you want to know what the body is doing with those hormones, why symptoms persist despite normal serum values, how estrogen is being metabolized, what the cortisol rhythm looks like across the day, or whether hormone metabolites suggest impaired detoxification or altered metabolism.
DUTCH answers the questions serum cannot, because it measures metabolites and diurnal patterns rather than a single circulating level at one moment.
The two mistakes to avoid
The first is ordering a DUTCH test when the clinical question is really does this patient have enough circulating estradiol or testosterone. That is a serum question, and DUTCH is the wrong tool for it.
The second is the reverse, relying only on serum when the real question is why does this patient still have symptoms despite apparently adequate hormone levels. That is a DUTCH question, and serum alone will not answer it.
Recognizing which question you are actually asking is most of the skill.
They are complements, not competitors
The best clinicians do not treat serum and DUTCH as rival tests where one wins. They choose the one that answers the clinical question they are trying to solve, and sometimes they use both, because the two provide complementary information.
A patient can have an adequate serum testosterone, answering do they have enough, while DUTCH explains why they are still symptomatic by showing how that testosterone is being metabolized. Together they tell a fuller story than either alone.
A few clear matches
- Confirming whether a dose is producing an expected circulating level — serum.
- A patient on topical progesterone — DUTCH, because serum does not reliably reflect tissue delivery for topical dosing.
- A suspected diurnal cortisol or HPA rhythm problem — DUTCH, because a single serum cortisol cannot show the daily pattern.
- Persistent estrogen-related symptoms where the metabolism pathway matters — DUTCH.
- A straightforward question of adequate circulating hormone or treatment safety — serum.
The functional takeaway
Serum and DUTCH are both standard, widely used tools in functional hormone practice, and neither is the default. The clinical question decides. Ask yourself what you are actually trying to learn, whether the patient has enough hormone and the treatment is safe, or what the body is doing with that hormone and why symptoms persist, and let that question choose the test. Sometimes the answer is both. Matching the test to the question is the whole discipline.
Written by Dr. Sheri Erwin, DNP, APRN, FNP-C
Founder, BridgeWell Integrative Education. 30+ years in healthcare, 16+ years training nurse practitioners. Systems-based, CE-accredited, and designed for NP scope from the ground up.
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