If you have been diagnosed with PCOS, you have probably had a handful of blood tests done.
Testosterone. LH. FSH. Maybe a glucose test.
And if those came back within the normal range, you may have been told there is not much to do except lose weight, take the pill, or wait and see.
But here is what most women with PCOS are never told.
PCOS is not one condition. It is a syndrome which means it is a collection of features that can have very different root causes in different women. And the blood tests that uncover those root causes go far beyond what is routinely ordered.
Understanding your specific PCOS picture is what makes treatment targeted, effective, and actually successful for conception.
This post walks you through the markers that matter.
FIRST, WHAT TYPE OF PCOS DO YOU HAVE?
This is the question that changes everything and it is almost never asked.
There are four main drivers of PCOS:
Insulin-driven PCOS ; the most common type, driven by insulin resistance
Inflammatory PCOS; driven by chronic low-grade inflammation
Adrenal PCOS; driven by elevated adrenal androgens (DHEA-S) rather than ovarian androgens
Post-pill PCOS; a temporary pattern that can emerge after stopping hormonal contraception
Each type has a different hormonal fingerprint. Each responds to different interventions. And you cannot identify which type you have without the right blood tests.
Here is what to ask for.
THE MARKERS THAT MATTER FOR PCOS
Fasting Insulin and HOMA-IR
This is the most important test most women with PCOS have never had.
Insulin resistance is present in approximately 70% of women with PCOS including lean women who would never be flagged as metabolically at risk.
The standard lab range for fasting insulin is 2-25 mIU/L. But the evidence-based optimal range is 2-8 mIU/L. A fasting insulin of 15 would pass through a standard panel without comment but it tells a functional medicine practitioner that insulin resistance is present and almost certainly driving androgen excess and ovulatory dysfunction.
HOMA-IR, calculated from fasting glucose and fasting insulin together is the most sensitive marker of early insulin resistance. A score above 1.5 warrants intervention even when glucose is completely normal.
If you have PCOS and you have never had your fasting insulin tested, this is the first thing to ask for.
Full Androgen Panel
Most standard panels check total testosterone only. But a complete androgen picture requires:
• Total testosterone
•Free testosterone (the biologically active form)
•DHEA-S (the adrenal androgen)
• Androstenedione
Why does this matter?
If your total testosterone is elevated but your DHEA-S is normal, the androgens are coming from your ovaries, likely driven by insulin resistance.
If your DHEA-S is elevated but your testosterone is only mildly raised, the androgens are coming from your adrenal glands, a different driver requiring a different approach.
These two scenarios look identical on a basic panel. They require completely different treatment.
Full Thyroid Panel
Thyroid dysfunction and PCOS frequently coexist and each makes the other worse.
Hypothyroidism increases insulin resistance. Insulin resistance worsens thyroid conversion. The two conditions create a cycle that is very difficult to break if the thyroid component is missed.
A full thyroid panel for women with PCOS should include TSH, Free T4, Free T3, and thyroid antibodies (TPO and thyroglobulin). TSH alone is not sufficient.
The optimal TSH for women with PCOS who are trying to conceive is 1.0-2.5 mIU/L, significantly narrower than the standard lab range of 0.5–4.5 mIU/L.
Inflammatory Markers
Chronic low-grade inflammation is both a feature and a driver of PCOS. It stimulates androgen production, worsens insulin resistance, and impairs egg quality.
The key inflammatory marker to request is hsCRP, high-sensitivity C-reactive protein.
The standard lab flags hsCRP as abnormal above 5 mg/L. But for fertility purposes, the optimal range is below 1.0 mg/L. An hsCRP of 2.8 would not raise a flag on a standard panel but it indicates a level of systemic inflammation that is actively working against ovulation and implantation.
If your hsCRP is elevated, the next question is why. Common drivers in women with PCOS include gut dysbiosis, food sensitivities, endometriosis, and poor sleep.
Vitamin D
Vitamin D deficiency is significantly more common in women with PCOS than in the general population and low vitamin D worsens both insulin resistance and inflammation, the two primary drivers of PCOS pathology.
The optimal range for fertility is 100-150 nmol/L. Most women with PCOS are well below this, even in sunny climates.
Vitamin D supplementation at 4000 IU daily has evidence for improving insulin sensitivity, reducing androgen levels, and supporting ovulation in women with PCOS.
Prolactin
Elevated prolactin, hyperprolactinaemia can mimic PCOS and is frequently missed because it is not always included in the initial workup.
Prolactin suppresses ovulation directly. It can be elevated by stress, certain medications, or a small pituitary growth called a prolactinoma.
The optimal range for fertility is below 400 mIU/L. If prolactin is elevated on a first test, it should always be repeated in a fasted, rested state before any conclusions are drawn, stress and even a recent meal can temporarily elevate it.
AMH (Anti-Müllerian Hormone)
Women with PCOS typically have elevated AMH reflecting the large number of small antral follicles characteristic of the condition.
While high AMH sounds positive, very elevated AMH (above 5-6 ng/mL) in the context of PCOS is associated with a higher risk of ovarian hyperstimulation syndrome (OHSS) during IVF stimulation. Knowing your AMH before beginning a cycle is essential for safe stimulation planning.
AMH can be tested on any day of the cycle and does not require fasting.
WHAT TO DO WITH THIS INFORMATION
If you have PCOS and you have not had this full panel tested, here is exactly what to say to your doctor:
"I have a PCOS diagnosis and I would like a comprehensive panel to identify the underlying drivers. Specifically I would like fasting insulin and glucose for HOMA-IR calculation, a full androgen panel including free testosterone and DHEA-S, full thyroid function including antibodies, hsCRP, vitamin D, prolactin, and AMH."
You are not asking for anything unreasonable. You are asking for the investigation that will actually explain your picture.
If your doctor is unfamiliar with this approach, the scripts and marker, explanations in the Lab Interpretation Guide for Fertility Health will help you navigate that conversation.
THE BIGGER PICTURE
PCOS is one of the most common causes of female infertility and one of the most treatable, when the root cause is correctly identified.
Insulin-driven PCOS responds extraordinarily well to dietary intervention, inositol supplementation, and targeted lifestyle changes. Inflammatory PCOS responds to anti-inflammatory nutrition and omega-3 supplementation. Adrenal PCOS requires a different supplement and stress management approach entirely.
But none of that is possible without the right tests.
The Lab Interpretation Guide for Fertility Health covers all of these markers in full including the conventional lab range, the evidence-based optimal range, and clear next steps for every result pattern.
If you have PCOS and you are trying to conceive, it was written for you.
→ Get the Lab Interpretation Guide here $47
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A FINAL WORD
You deserve more than a diagnosis and a prescription.
You deserve to understand what is actually driving your PCOS and what specifically can be done about it.
That starts with the right blood tests. And it starts with knowing what the results actually mean.
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