The most common barrier to getting comprehensive bloodwork is simply not knowing to ask for it. Standard annual panels vary by province and physician, and many of the markers described here will not be ordered unless specifically requested. This is not because your physician is withholding information — it is because routine screening protocols were not designed around the needs of perimenopausal women.
A practical approach is to arrive at your annual appointment with a written list of what you want tested and a brief explanation of why each is relevant. Framing it in terms of symptoms — fatigue that is affecting your function, hair changes, cognitive changes, weight shifts despite no change in eating — gives your physician clinical context for ordering a broader panel. If a specific test is declined, asking which tests are covered and which would require a co-pay gives you the information to make an informed choice about what to prioritise.
Working with a registered dietitian who understands perimenopause is one of the most effective ways to interpret results in nutritional context and build a targeted plan based on what your bloodwork actually shows. A result that is technically normal may still indicate a gap worth addressing. A result that is flagged low does not always require medication — often it requires a nutritional intervention that no one has yet prescribed. And knowing which intervention, at which dose, for how long, is exactly the kind of targeted guidance that makes the difference between vague general advice and something that actually moves the needle on how you feel.
📞 If you have been told your labs are normal but you know something is off, we can help you understand what the numbers actually mean for your body in perimenopause. At The Menopause Dietitians, we review bloodwork in nutritional context and build targeted strategies based on what your results actually show. Click the button below to book your free 20-minute Menopause Strategy Call.
A practical approach is to arrive at your annual appointment with a written list of what you want tested and a brief explanation of why each is relevant. Framing it in terms of symptoms — fatigue that is affecting your function, hair changes, cognitive changes, weight shifts despite no change in eating — gives your physician clinical context for ordering a broader panel. If a specific test is declined, asking which tests are covered and which would require a co-pay gives you the information to make an informed choice about what to prioritise.
Working with a registered dietitian who understands perimenopause is one of the most effective ways to interpret results in nutritional context and build a targeted plan based on what your bloodwork actually shows. A result that is technically normal may still indicate a gap worth addressing. A result that is flagged low does not always require medication — often it requires a nutritional intervention that no one has yet prescribed. And knowing which intervention, at which dose, for how long, is exactly the kind of targeted guidance that makes the difference between vague general advice and something that actually moves the needle on how you feel.
📞 If you have been told your labs are normal but you know something is off, we can help you understand what the numbers actually mean for your body in perimenopause. At The Menopause Dietitians, we review bloodwork in nutritional context and build targeted strategies based on what your results actually show. Click the button below to book your free 20-minute Menopause Strategy Call.
What to Say at Your Appointment
High-sensitivity C-reactive protein, or hsCRP, is a marker of systemic inflammation. Unlike standard CRP, which is used to detect active infection or acute inflammation, hsCRP detects the low-grade chronic inflammation that is increasingly recognised as a central driver of cardiovascular disease, cognitive decline, and metabolic dysfunction — all of which accelerate in menopause. Elevated hsCRP is an independent cardiovascular risk marker and is directly affected by dietary and lifestyle factors, making it both prognostically meaningful and practically modifiable.
In perimenopausal women, hsCRP tends to rise as estrogen declines, reflecting the pro-inflammatory shift of the menopausal transition. Levels above 3 mg/L are associated with significantly elevated cardiovascular risk. The good news is that hsCRP responds to the same anti-inflammatory nutritional interventions — omega-3 fatty acids, Mediterranean dietary pattern, fibre, reduced refined carbohydrate — that are broadly beneficial in menopause, giving it value both as a diagnostic marker and as a treatment response measure.
Key inflammatory and metabolic markers worth including:
In perimenopausal women, hsCRP tends to rise as estrogen declines, reflecting the pro-inflammatory shift of the menopausal transition. Levels above 3 mg/L are associated with significantly elevated cardiovascular risk. The good news is that hsCRP responds to the same anti-inflammatory nutritional interventions — omega-3 fatty acids, Mediterranean dietary pattern, fibre, reduced refined carbohydrate — that are broadly beneficial in menopause, giving it value both as a diagnostic marker and as a treatment response measure.
Key inflammatory and metabolic markers worth including:
- hsCRP (high-sensitivity C-reactive protein) — low-grade inflammation; cardiovascular risk marker
- Homocysteine — elevated levels associated with cardiovascular disease and cognitive decline; affected by B vitamin status
- Fasting lipid panel — total cholesterol, LDL, HDL, triglycerides; see blog four in this series for detailed interpretation
Inflammatory Markers: hsCRP and Beyond
Fasting blood glucose — a standard metabolic screen — measures blood sugar after an overnight fast. It is useful for diagnosing frank diabetes, but it misses the earlier stages of metabolic dysfunction that are extremely common in perimenopause. Fasting glucose can remain entirely normal for years while insulin resistance is already developing. The reason is that insulin rises to compensate for emerging resistance, keeping glucose in range while the underlying metabolic shift proceeds.
Fasting insulin, ordered alongside fasting glucose, is a more sensitive early marker of insulin resistance. The HOMA-IR calculation — a formula using fasting glucose and fasting insulin together to estimate insulin resistance — can identify metabolic dysfunction years before fasting glucose alone signals a problem. This matters because insulin resistance in perimenopause is directly connected to weight gain, particularly central adiposity, energy crashes, carbohydrate cravings, and long-term cardiovascular and metabolic risk.
HbA1c (glycated haemoglobin) measures average blood glucose over the preceding 8 to 12 weeks, providing a different view than a single fasting snapshot. It is more reliable than a single fasting glucose reading and is a standard screening tool for pre-diabetes and diabetes. In perimenopausal women, all three together — fasting glucose, fasting insulin, and HbA1c — provide a meaningful metabolic picture that fasting glucose alone cannot.
What to request for a complete metabolic screen:
Fasting insulin, ordered alongside fasting glucose, is a more sensitive early marker of insulin resistance. The HOMA-IR calculation — a formula using fasting glucose and fasting insulin together to estimate insulin resistance — can identify metabolic dysfunction years before fasting glucose alone signals a problem. This matters because insulin resistance in perimenopause is directly connected to weight gain, particularly central adiposity, energy crashes, carbohydrate cravings, and long-term cardiovascular and metabolic risk.
HbA1c (glycated haemoglobin) measures average blood glucose over the preceding 8 to 12 weeks, providing a different view than a single fasting snapshot. It is more reliable than a single fasting glucose reading and is a standard screening tool for pre-diabetes and diabetes. In perimenopausal women, all three together — fasting glucose, fasting insulin, and HbA1c — provide a meaningful metabolic picture that fasting glucose alone cannot.
What to request for a complete metabolic screen:
- Fasting blood glucose — standard screen; normal does not rule out insulin resistance
- Fasting insulin — more sensitive marker of early metabolic dysfunction
- HbA1c (glycated haemoglobin) — 8-to-12-week average of blood glucose control
- HOMA-IR — calculated from fasting glucose and insulin; screens for insulin resistance
Fasting Glucose, Insulin, and HbA1c: The Metabolic Picture
Vitamin D, specifically 25-hydroxyvitamin D (25-OH D), should be on every perimenopausal woman's annual bloodwork. It is not always ordered without a specific request. Vitamin D insufficiency is extraordinarily common in Canada and affects bone health, immune regulation, mood, muscle function, cardiovascular risk, and insulin sensitivity — all of which are areas of elevated concern in menopause.
The standard reference range flags deficiency below 50 nmol/L. But research on optimal function — particularly for bone protection, immune health, and mood — consistently suggests a target range of 100 to 150 nmol/L. Many women with levels between 50 and 100 nmol/L are technically 'sufficient' but are not in the range where vitamin D's protective effects are most robust. This is a case where knowing your number, not just whether you are above a threshold, matters.
Supplementation recommendations should be based on your actual level, your sun exposure, and your absorption capacity — not a one-size dose. Retesting after 8 to 12 weeks of supplementation is appropriate to confirm levels are moving in the right direction.
Target range for 25-OH vitamin D:
The standard reference range flags deficiency below 50 nmol/L. But research on optimal function — particularly for bone protection, immune health, and mood — consistently suggests a target range of 100 to 150 nmol/L. Many women with levels between 50 and 100 nmol/L are technically 'sufficient' but are not in the range where vitamin D's protective effects are most robust. This is a case where knowing your number, not just whether you are above a threshold, matters.
Supplementation recommendations should be based on your actual level, your sun exposure, and your absorption capacity — not a one-size dose. Retesting after 8 to 12 weeks of supplementation is appropriate to confirm levels are moving in the right direction.
Target range for 25-OH vitamin D:
- Deficient: below 50 nmol/L — supplementation essential
- Insufficient: 50 to 75 nmol/L — supplementation strongly recommended
- Sufficient: 75 to 100 nmol/L — adequate but not optimal for many
- Optimal: 100 to 150 nmol/L — where most evidence for protective effects sits
Vitamin D: The Test That Should Be Standard and Often Isn't
Standard iron screening often stops at haemoglobin and haematocrit — the measures used to diagnose anaemia. But haemoglobin is a late-stage marker. Iron stores in the body have been significantly depleted before haemoglobin drops. The marker that catches depletion early is ferritin, the protein that stores iron in tissues, and it is one of the most commonly underordered and underinterpreted tests in women's health.
Ferritin below 30 nanograms per millilitre — a level many labs still report as within the normal range — is associated with fatigue, poor concentration, hair loss, restless legs, reduced exercise tolerance, and worsened mood. These are also, as you will have noticed, symptoms of perimenopause. The overlap makes iron depletion easy to attribute to menopause and leave unaddressed. Women who are still menstruating, particularly those with heavy or irregular perimenopausal bleeding, are at elevated risk.
A complete iron panel also includes serum iron and transferrin saturation, which together with ferritin give a fuller picture of iron availability versus storage. If ferritin is low, working with your dietitian to optimise dietary iron and identifying whether supplementation is needed is a concrete, addressable step with real symptom impact.
What to request:
Ferritin below 30 nanograms per millilitre — a level many labs still report as within the normal range — is associated with fatigue, poor concentration, hair loss, restless legs, reduced exercise tolerance, and worsened mood. These are also, as you will have noticed, symptoms of perimenopause. The overlap makes iron depletion easy to attribute to menopause and leave unaddressed. Women who are still menstruating, particularly those with heavy or irregular perimenopausal bleeding, are at elevated risk.
A complete iron panel also includes serum iron and transferrin saturation, which together with ferritin give a fuller picture of iron availability versus storage. If ferritin is low, working with your dietitian to optimise dietary iron and identifying whether supplementation is needed is a concrete, addressable step with real symptom impact.
What to request:
- Ferritin — iron storage; aim for above 50 ng/mL for optimal function
- Serum iron — current circulating iron
- Transferrin saturation — how much of the iron-transport protein is carrying iron
- Haemoglobin and haematocrit — standard anaemia markers, but late-stage indicators
The Iron Panel: Ferritin Is the One That Matters
TSH, or thyroid-stimulating hormone, is the standard thyroid screening test. It measures the signal the pituitary gland sends to the thyroid to produce more hormone — not the thyroid hormone itself. It is a useful first-pass test, but it tells an incomplete story, and in perimenopausal women whose symptoms substantially overlap with hypothyroidism (fatigue, weight gain, brain fog, constipation, hair thinning, cold intolerance, low mood), an incomplete story is not good enough.
A full thyroid panel includes TSH alongside free T4, the inactive hormone the thyroid produces, and free T3, the active hormone that actually does the work at the cellular level. Some women convert T4 to T3 inefficiently — a process affected by nutrient status, stress, inflammation, and gut health — and have normal TSH and T4 but low free T3. They feel hypothyroid in every clinical sense. Standard testing misses them entirely.
Thyroid antibodies — specifically anti-TPO and anti-thyroglobulin antibodies — are also worth checking if autoimmune thyroid disease is suspected. Hashimoto's thyroiditis, an autoimmune condition that progressively damages the thyroid, is significantly more common in women and can be active for years before TSH shifts enough to trigger a diagnosis.
What to request:
A full thyroid panel includes TSH alongside free T4, the inactive hormone the thyroid produces, and free T3, the active hormone that actually does the work at the cellular level. Some women convert T4 to T3 inefficiently — a process affected by nutrient status, stress, inflammation, and gut health — and have normal TSH and T4 but low free T3. They feel hypothyroid in every clinical sense. Standard testing misses them entirely.
Thyroid antibodies — specifically anti-TPO and anti-thyroglobulin antibodies — are also worth checking if autoimmune thyroid disease is suspected. Hashimoto's thyroiditis, an autoimmune condition that progressively damages the thyroid, is significantly more common in women and can be active for years before TSH shifts enough to trigger a diagnosis.
What to request:
- TSH — standard first-pass screen
- Free T4 — inactive thyroid hormone produced by the thyroid gland
- Free T3 — active thyroid hormone; low levels can explain symptoms despite normal TSH
- Anti-TPO antibodies — screens for Hashimoto's thyroiditis, the most common autoimmune thyroid condition
The Thyroid Panel: TSH Is Not Enough
You leave your annual physical with a clean bill of health. All your labs came back normal. And yet you are exhausted, your hair is thinning, you cannot think clearly, you have gained weight despite eating the same way you always have, and your joints ache in the morning. You have been told everything looks fine — and you are increasingly convinced that either you are imagining things, or the tests are not looking at the right things.
In most cases, it is the latter. Standard bloodwork panels ordered at routine appointments were not designed with perimenopausal and postmenopausal women in mind. They catch acute illness and flag obvious pathology. What they frequently miss is the kind of subclinical, functional disruption that drives the experience of menopause: the early metabolic shifts, the micronutrient depletions, the inflammatory changes, the hormonal fluctuations that are genuinely affecting your quality of life but fall just inside the boundaries of what a standard reference range calls normal. This post is about which tests actually matter in menopause — and how to advocate for them.