Lab Work for Women: What’s Evidence-Based (and What’s Noise)
Just the facts with Dr. Michelle Jacobson OBGYN and Chief Medical Officer at Coven Women’s Health
Women are asking better questions about their health than ever before.
We hear things like:
“My iron is technically normal, but I feel exhausted.”
“My vitamin D is low-normal — is that good enough?”
“Should I test my free testosterone?”
“Do I need a DUTCH test?”
“Are my levels optimal or just normal?”
These are smart questions.
But here’s what often gets lost:
Lab work is a tool. Not a diagnosis. Not a treatment plan. Not a personality test.
Let’s break down what actually matters.
1. “Normal” Does Not Always Mean “Optimal”
Lab reference ranges are statistical. They represent where 95% of a general population falls.
They are not designed around:
Women in midlife
Athletes
Postpartum women
Women with heavy periods
Women under chronic stress
Iron (Ferritin)
Many labs list ferritin “normal” as low as 15–20 µg/L.
A woman can absolutely be:
Within “normal”
Not anemic
And still symptomatic
Low ferritin (even within range) can contribute to:
Fatigue
Hair shedding
Poor exercise tolerance
Brain fog
Context matters. Symptoms matter. There is no universally agreed upon “normal” ferritin for symptomatic women.
Vitamin D
Vitamin D is another common one.
Some labs consider 50 nmol/L “sufficient.”
Others aim higher.
The evidence supports:
Avoiding deficiency
Supporting bone health
Considering immune and mood implications
But megadosing without indication?
Not evidence-based.
The goal isn’t to chase high numbers.
It’s to correct deficiency thoughtfully. Vitamin D matters when it comes to bone, heart, brain, and breast health.
2. Hormone Testing: When It Helps — and When It Doesn’t
Hormones fluctuate. Daily. Monthly. Across life stages.
A single blood draw rarely captures the full picture.
For example:
Estrogen changes across the cycle.
Progesterone depends on ovulation.
Testosterone levels measured in women are very low and hard to quantify accurately with the tools we have.
Cortisol follows a diurnal rhythm.
Testing can be helpful — but only when the result will change management.
We don’t test hormones to satisfy curiosity.
We test when it guides care.
3. What About “Advanced” Hormone Testing?
You may have heard of:
DUTCH testing
Salivary cortisol panels
Extensive hormone metabolite mapping
These tests can look comprehensive and compelling.
But here are the important questions:
Does this test change treatment decisions in a way that improves outcomes? Is this test validated (connected to symptoms or outcomes?)
In many cases, current clinical guidelines do not require these tests for routine women’s health care.
More data does not always equal better care.
Sometimes it creates anxiety.
Sometimes it leads to unnecessary supplementation.
Sometimes it distracts from more important root issues like sleep, nutrition, stress, or iron deficiency.
4. “Optimize Everything” Culture
There is a growing narrative that every biomarker must be:
High-normal
Perfectly balanced
Continuously tracked
This is not how physiology works.
Health is not achieved by pushing every number to the top of a range.
It is achieved by:
Addressing deficiencies
Managing risk factors
Interpreting labs alongside symptoms
Understanding the whole person
Not chasing perfection.
5. So What Is Evidence-Based?
Evidence-based women’s lab care generally focuses on:
Iron studies (when fatigue, heavy cycles, or hair loss are present)
Vitamin D (especially in northern climates)
Thyroid function
Metabolic markers (glucose, insulin, lipids)
Inflammation markers when clinically indicated
Hormones when symptoms, need for monitoring, or life stage warrant testing
Not every woman needs every test.
Testing should answer a clinical question.
6. The Real Takeaway
If you’ve been told:
“Your labs are normal, you’re fine.”
And you don’t feel fine — that deserves attention.
But the solution is not ordering every trending test online.
The solution is thoughtful interpretation.
Good lab care means:
Knowing what to test
Knowing when not to test
Understanding ranges
Listening to symptoms
And building a plan that makes sense for you
Lab work should bring clarity — not confusion.
You deserve care that is grounded, not trendy.
So, now what?
At Coven Women’s Health we order comprehensive labs where appropriate and we spend time with you to interpret results. More importantly, we look at the TOTAL picture - your history, your symptoms, your quality of life and, most importantly, your vision for a healthier you.
Looking for a second opinion or starting from scratch on your health journey? Book with our one of our women’s health experts today.
A great starting place for anyone who is “lab curious”: Total Hormonal Health Assessment and Medical Consultation
