Testing for PCOS: What to Check & What Gets Missed

If you’ve ever been told, “Your blood tests are fine,” yet you’re still dealing with irregular cycles, acne, hair thinning, fatigue, or weight resistance — you’re not imagining things.

Many women with PCOS feel frustrated after initial testing. Either results come back “normal,” or they’re told they meet criteria — but no one explains what to do next.

Testing for PCOS isn’t just about confirming a diagnosis. It’s about understanding what’s driving your symptoms.

And often, that’s where important pieces get missed.

Typical Testing for PCOS

PCOS is usually diagnosed using the Rotterdam Criteria, which includes:

• Irregular or absent ovulation

• Elevated androgens

• Polycystic-appearing ovaries on ultrasound

However, diagnosis alone doesn’t tell you:

• Why your symptoms are occurring

• Whether insulin resistance is present

• Whether inflammation is contributing

• If thyroid dysfunction is involved

• If nutrient deficiencies are worsening symptoms

This is where comprehensive testing becomes valuable.

The Androgen Panel: More Than Just Testosterone

Many women only have total testosterone checked. While this is important, it’s not enough.

A complete androgen panel should include:

• Total Testosterone

• Free Testosterone

• DHEAS

• SHBG (Sex Hormone Binding Globulin)

DHEAS is particularly important, as it reflects adrenal androgen production and may explain symptoms such as acne, hair thinning, or excess facial hair — even when testosterone appears normal.

SHBG also plays a key role, as low levels can increase free circulating androgens.

Without a full picture, androgen excess can be missed.

Other Sex Hormones Matter (And Timing Is Crucial)

Beyond androgens, assessing reproductive hormones can provide insight into ovulation patterns and hormonal rhythm. These may include:

• FSH

• LH

• Estrogen

• Progesterone

• SHBG

However, timing matters.

Hormone levels fluctuate throughout the cycle. Testing Estrogen, FSH and LH is typically done early in the cycle (around day 2–3), while progesterone is best assessed mid-luteal phase to confirm ovulation.

Testing at the wrong time can lead to confusing or misleading results.

Insulin Resistance: The Driver That’s Often Overlooked

Insulin resistance plays a central role in many PCOS cases — yet it’s not always properly assessed.

Helpful markers include:

• Fasting insulin

• Fasting glucose

• HbA1c

While fasting glucose and HbA1c are commonly tested, fasting insulin is often missed — despite being one of the most useful early indicators of metabolic dysfunction.

Elevated insulin can drive androgen production, increase inflammation, and disrupt ovulation — even when blood sugar levels appear “normal.”

Thyroid Testing: Overlapping Symptoms

An underactive thyroid can mimic PCOS symptoms, including:

• Fatigue

• Weight gain

• Irregular cycles

• Hair thinning

A comprehensive thyroid panel should include:

• TSH

• Free T4

• Free T3

• Thyroid antibodies (TPO and Tg antibodies)

Without checking antibodies, autoimmune thyroid conditions may be missed, even when TSH falls within range.

Inflammation & Immune Markers

Chronic low-grade inflammation is common in PCOS.

Markers that may be assessed include:

• CRP (C-reactive protein)

• ESR

• White blood cell count

Inflammation can also be reflected in symptoms such as:

• Gut disturbances

• Persistent acne

• Skin conditions

• Ongoing fatigue

Testing gives one piece of the picture — symptom patterns give another.

Nutrient Status & Vitamin D

Vitamin D deficiency is common in women with PCOS and may influence:

• Insulin sensitivity

• Immune regulation

• Hormonal balance

• Fertility outcomes

Other nutrient markers may also be valuable depending on symptoms, including iron, B12, folate, and zinc.

Correcting deficiencies can significantly improve symptom presentation.

Liver Enzymes & Fatty Liver

Fatty liver (non-alcoholic fatty liver disease) is more common in women with PCOS, particularly when insulin resistance is present.

Liver enzymes such as ALT, AST, and GGT can provide insight into liver health and metabolic strain.

Supporting liver function can improve hormone clearance and reduce androgen burden.

Why So Many Women Feel Stuck

Here’s the common scenario:

• You have symptoms.

• You get basic testing.

• Results come back “within range.”

• You’re told everything looks fine.

But “within range” doesn’t always mean optimal.

And without a comprehensive, interpreted picture, you’re left with data, but no direction.

Testing should answer the question:

What is driving your PCOS?

Not just: Do you have it?

The Goal of Testing Isn’t Just Diagnosis

It’s clarity.

When we understand whether insulin resistance, inflammation, thyroid dysfunction, adrenal androgens, or nutrient deficiencies are contributing we can create targeted, meaningful intervention.

Testing should reduce overwhelm, not add to it.

It should provide a roadmap.

If You’re Feeling Frustrated by “Normal” Results

You’re not alone.

PCOS is complex. Hormones are dynamic. And lab reference ranges don’t always reflect how you feel in your body.

With the right investigation and interpretation, there is often more insight to uncover.

Because the goal isn’t just to confirm a diagnosis.

It’s to understand your body — so you know what to do next.