If you have PCOS — or suspect you might — there is a good chance your blood tests have not told you the full story.
This is one of the most common frustrations women bring into a functional medicine consultation. They have had blood work done. Their doctor glanced at the results and said everything looks normal. And yet they are still exhausted, still gaining weight around the middle, still losing hair, still breaking out along the jawline, still unable to shift the scale despite doing everything right.
Normal on paper. Anything but normal in their body.
The problem is not always the results. It is which tests were run in the first place.
Standard blood panels for PCOS are frequently incomplete. They test what is convenient and what fits neatly into a 10-minute consultation — not what actually gives you a functional picture of what your hormones, insulin, and metabolism are doing.
This article tells you exactly which blood tests matter for PCOS, why each one is relevant, and what you should be looking for in the results. Because understanding your own hormonal picture is the first step toward actually doing something about it.
Why Most Standard PCOS Panels Fall Short
A typical blood panel ordered for suspected PCOS in the South African private healthcare setting might include:
- Total testosterone
- LH and FSH
- TSH (thyroid)
- A basic metabolic panel including blood glucose
This is a starting point. It is not a complete picture. And in many cases, it is not even a good starting point — because several of the most diagnostically important markers are absent entirely.
Free testosterone is almost never included, despite being a far more relevant marker than total testosterone. Fasting insulin — the single most important metabolic test for PCOS — is routinely omitted. The thyroid is assessed with TSH alone, which misses subclinical dysfunction and autoimmune thyroid disease entirely. Progesterone to confirm ovulation is rarely timed correctly, if it is tested at all.
The result is women who are told their hormones are fine when what has actually happened is that the right questions were never asked.
The Complete PCOS Blood Test Panel
Here is every test that should be part of a comprehensive PCOS hormonal assessment, grouped by what each one tells you.
Androgens — The Hormones Most Associated With PCOS Symptoms
Free Testosterone This is the biologically active form of testosterone — the fraction that is not bound to proteins and is therefore able to act on your tissues. Free testosterone drives androgenic symptoms like acne, hair loss, and unwanted facial hair. It is a more sensitive marker of androgen excess in PCOS than total testosterone, and it is frequently normal even when free testosterone is elevated.
Always request free testosterone specifically. Total testosterone alone is not sufficient.
Total Testosterone Still useful as a baseline, particularly for calculating the free androgen index alongside SHBG. But it should never be the only androgen marker tested.
SHBG (Sex Hormone Binding Globulin) SHBG is the protein that binds to testosterone and keeps it inactive. Low SHBG means more free testosterone circulating in your bloodstream — and more available to drive symptoms. Low SHBG is also a sensitive indirect marker of insulin resistance, since elevated insulin suppresses SHBG production in the liver. This single result can tell you a great deal about your metabolic picture.
DHEA-S This androgen is produced primarily by the adrenal glands rather than the ovaries. Elevated DHEA-S suggests that the adrenal glands are contributing to your androgen load — which has implications for how the condition is managed. Adrenal-driven PCOS responds differently to treatment than ovarian-driven PCOS, and distinguishing between the two requires this test.
Insulin and Metabolic Markers — The Root of the Problem for Most Women
Fasting Insulin This is arguably the most important test in a PCOS panel and the one most consistently omitted from standard workups.
Blood glucose can remain perfectly normal for years while insulin is chronically elevated — your pancreas simply compensates by pumping out more and more insulin to maintain glucose control. By the time blood glucose rises, insulin resistance has typically been present for a long time.
Fasting insulin catches this early. A result above 10 mIU/L on a fasting sample warrants attention. A result above 15 is significant. Most laboratory reference ranges mark results as normal up to 25 or higher — a threshold that is population-based, not optimal.
If your doctor has never tested your fasting insulin, you do not yet have a complete PCOS picture. Full stop.
HOMA-IR HOMA-IR is a calculated score derived from your fasting insulin and fasting glucose. It gives a direct index of insulin resistance severity. A score above 2.0 suggests meaningful insulin resistance. Above 2.5 is significant. This is a simple calculation your practitioner can perform from the same fasting blood draw.
Fasting Glucose and HbA1c These are the standard markers of blood sugar regulation. HbA1c reflects your average blood glucose over the preceding two to three months and is useful for identifying pre-diabetic patterns before they progress. Useful as context, but insufficient on their own without fasting insulin.
Full Lipid Panel Insulin resistance commonly produces a characteristic lipid pattern: elevated triglycerides, low HDL cholesterol, and small dense LDL particles. This pattern is associated with cardiovascular risk and is frequently present in PCOS even in lean women. It should be assessed as part of every comprehensive PCOS workup.
Reproductive Hormones — Understanding Your Cycle and Ovulation
LH and FSH (Day 2 to 5 of Cycle) LH (luteinising hormone) and FSH (follicle stimulating hormone) govern follicle development and ovulation. In PCOS, LH is typically elevated relative to FSH — a ratio above 2:1 is a classic PCOS finding. This skewed ratio disrupts the normal process of follicle selection and maturation, impairing ovulation and egg quality.
These must be tested on days 2 to 5 of your menstrual cycle for the results to be interpretable. A single untimed LH or FSH result has limited diagnostic value.
Oestradiol (Day 2 to 5) Baseline oestradiol at the start of the cycle reflects the baseline activity of the ovaries and helps contextualise the LH and FSH results.
Progesterone (Day 21, or 7 Days Post Ovulation) Progesterone is produced after ovulation and is the only reliable way to confirm that ovulation actually occurred in a given cycle. A level above 16 to 18 nmol/L on day 21 confirms ovulation. A lower result suggests either that ovulation did not occur or that the luteal phase is inadequate — both of which are relevant to fertility and to understanding your PCOS picture.
This test is frequently done at the wrong time, or not at all. If you have regular periods and have been told your hormones are normal, ask specifically whether your day 21 progesterone has been measured — and at the correct point in your cycle.
Prolactin Elevated prolactin suppresses ovulation and produces a symptom picture that overlaps significantly with PCOS — irregular cycles, infertility, and sometimes breast tenderness or discharge. It is not technically a PCOS marker, but it should always be excluded as a contributing or confounding factor.
AMH (Anti-Mullerian Hormone) AMH reflects the size of your remaining egg pool and is typically elevated in PCOS due to the large number of small resting follicles. It is a useful confirmatory marker for polycystic ovarian morphology and is also used to assess ovarian reserve, particularly relevant if you are considering conception. AMH does not need to be timed to your cycle and can be drawn on any day.
Thyroid — Frequently Missed, Always Relevant
A TSH result alone is not a thyroid panel. It is a single data point that can appear reassuring while significant dysfunction is present at the tissue level.
A complete thyroid panel for PCOS includes:
TSH The pituitary signal telling the thyroid to produce hormones. Useful as a screening marker, but the conventional reference range (up to 4.5 or even 5.0 in some laboratories) is wider than what is considered optimal for hormonal health and fertility. A TSH above 2.5 warrants closer attention in the context of PCOS symptoms.
Free T3 The active thyroid hormone — the form that actually enters your cells and drives metabolic function. Many women have a normal TSH but poor T3 conversion, meaning the signal to the thyroid is fine but the active hormone is insufficient. This will never be identified without testing Free T3 specifically.
Free T4 The inactive precursor that is converted to T3. Low Free T4 with a normal TSH can indicate early thyroid insufficiency.
Reverse T3 In chronic stress and inflammatory states — both common in PCOS — the body can shunt T4 toward reverse T3 rather than active T3. Elevated reverse T3 causes functional hypothyroidism even when TSH and T4 appear normal. It is not routinely tested but is diagnostically important in women with PCOS who have fatigue, cold intolerance, weight resistance, or hair loss.
TPO and TG Antibodies These antibodies identify Hashimoto’s thyroiditis — an autoimmune condition that is significantly more prevalent in women with PCOS than in the general population. Antibodies can be elevated for years before TSH becomes abnormal. Identifying Hashimoto’s early allows for proactive management that protects thyroid function over time.
Nutrient and Inflammatory Markers — The Ones That Complete the Picture
Ferritin Stored iron. Hair follicles are highly sensitive to ferritin levels, and a level below 70 micrograms per litre is associated with significant hair shedding — even when haemoglobin appears normal. If you are experiencing hair loss alongside PCOS (a topic we covered in depth in our article on PCOS hair loss), ferritin is a non-negotiable part of your panel.
Vitamin D Deficiency is extraordinarily common in South African women despite our climate — particularly in those who avoid sun exposure or have darker skin tones. Vitamin D receptors are present on ovarian cells and play a direct role in follicle development, insulin sensitivity, and immune regulation. A level below 75 nmol/L is suboptimal for hormonal health.
Zinc and Selenium Both are essential for thyroid hormone conversion, egg quality, and healthy androgen metabolism. Zinc is a natural 5-alpha reductase inhibitor — meaning it reduces DHT production at the follicle level. Deficiency is common in PCOS and directly worsens androgenic symptoms.
Magnesium Plays a central role in insulin receptor function, cortisol regulation, and sleep quality. Deficiency is almost universal in women with PCOS and is rarely tested. Serum magnesium is a poor indicator of intracellular status — red blood cell magnesium is a more accurate marker if available.
B12 and Folate Critical for cellular function, methylation, and — if you are considering pregnancy — neural tube development. Women with PCOS who have been on Metformin long-term are at particular risk of B12 depletion, as Metformin impairs B12 absorption.
Homocysteine An amino acid that accumulates when methylation pathways are impaired. Elevated homocysteine is associated with cardiovascular risk, miscarriage risk, and is an indirect marker of B12 and folate insufficiency. It is inexpensive to test and rarely included in standard panels.
hs-CRP High-sensitivity C-reactive protein — a marker of systemic inflammation. Elevated in most women with PCOS and directly impairs insulin signalling and ovarian function. Useful as a baseline to track the impact of dietary and lifestyle intervention over time.
How to Read Your Results: The Optimal vs Normal Distinction
This is one of the most important concepts in functional medicine — and one of the most commonly misunderstood.
Laboratory reference ranges are derived from population averages. They tell you what is statistically common, not what is optimal for health and hormonal function. A result that falls within the reference range can still be suboptimal — particularly for markers like TSH, fasting insulin, ferritin, and vitamin D where the lower and upper boundaries of the conventional range are set far wider than what functional medicine considers ideal.
When reviewing your results, the questions to ask are not just “is this in range” but “is this optimal” and “does this result, in the context of my other results and my symptoms, form a coherent hormonal picture.”
That kind of interpretation requires someone who understands hormonal complexity — not just reference ranges.
If you have a stack of blood results and are not sure what they mean, or if you have been told everything is normal but you know something is not right, a structured review of your existing results is often the most efficient place to start.
That is exactly what the R399 Quick Blood Test Review at askdrolz.com is designed for — a focused, expert review of your current blood work through a functional medicine lens, identifying what has been missed, what needs follow-up, and what your results are actually telling you about your hormonal health.
How to Have This Conversation With Your Doctor
Asking for additional tests in a standard GP consultation can feel uncomfortable. Here is how to approach it practically:
Be specific about what you are requesting. “I would like to test my fasting insulin and HOMA-IR alongside my standard panel” is more likely to be actioned than “I want a full hormone check.”
Request tests at the right time. LH, FSH, and oestradiol should be on days 2 to 5. Progesterone should be on day 21. If your doctor orders these tests without specifying cycle day, the results may be uninterpretable.
Ask for a copy of your results. In South Africa you are entitled to your own blood work. Having the actual numbers — not just a verbal “all normal” — allows you to seek a second opinion or a more detailed review.
If your GP is reluctant, it is entirely reasonable to seek an additional opinion from a practitioner who specialises in hormonal health. Many of the tests listed in this article can be requested directly through private pathology laboratories without a GP referral, though interpretation always requires clinical context.
And if you already have results but are unsure whether the right tests were run or what they mean, the R399 Quick Blood Test Review at askdrolz.com gives you a direct line to expert interpretation — without waiting weeks for a specialist appointment.
A Quick Reference: The Complete PCOS Blood Test Checklist
Androgens
- Free testosterone
- Total testosterone
- SHBG
- DHEA-S
Insulin and Metabolic
- Fasting insulin
- HOMA-IR
- Fasting glucose
- HbA1c
- Full lipid panel
Reproductive Hormones
- LH and FSH (day 2 to 5)
- Oestradiol (day 2 to 5)
- Progesterone (day 21)
- Prolactin
- AMH
Thyroid
- TSH
- Free T3
- Free T4
- Reverse T3
- TPO and TG antibodies
Nutrients and Inflammation
- Ferritin
- Vitamin D
- Zinc and selenium
- Magnesium
- B12 and folate
- Homocysteine
- hs-CRP
Print this list. Take it to your next appointment. Ask for what you need.
The Bottom Line
A PCOS diagnosis without comprehensive testing is an incomplete diagnosis. And an incomplete diagnosis leads to incomplete treatment — which is why so many women spend years managing symptoms rather than addressing the root cause.
The tests in this article are not exotic or experimental. They are well-established markers that give a functional, integrated picture of what is driving your PCOS. They are available through private pathology in South Africa. And they are the foundation of any serious hormonal health strategy.
If you have results already, the next step is making sure they are being read correctly. If you do not, the next step is knowing exactly what to ask for.
Either way, you deserve a blood panel that actually tells you something.
Disclaimer: This article is for educational purposes only and does not constitute medical advice. All testing and supplementation should be undertaken with the guidance of a qualified healthcare practitioner familiar with your full clinical history.
Already have blood results but not sure what they mean? Book a R399 Quick Blood Test Review with Dr Olz — a focused functional medicine review of your existing results so you finally know what your hormones are actually telling you.
