Standard annual bloodwork is useful. It can catch serious problems - diabetes, kidney disease, dangerous lipid levels, thyroid dysfunction in obvious cases. But "useful" and "comprehensive" aren't the same thing, and for many women, standard panels miss exactly the things that explain why they feel run-down, foggy, or off in ways that are hard to articulate.
The tests listed here are not exotic or fringe. They're available at any major lab, covered by most insurance when ordered by a physician with appropriate clinical justification, and routinely ordered by specialists. The gap is that primary care physicians, working under time pressure with a focus on common acute conditions, often don't order them unless a patient specifically asks.
This is a guide for the informed patient - someone who wants to come in with a specific conversation rather than hoping the standard panel covers everything. It's not a substitute for clinical evaluation. What your results mean depends on context only your doctor has.
Full thyroid panel (not just TSH)
TSH - thyroid-stimulating hormone - is the standard screening test for thyroid function. It measures how hard the pituitary is working to stimulate the thyroid, which gives indirect information about thyroid output. TSH is a reasonable screening tool. It catches overt hypothyroidism.
What it misses: the actual hormones the thyroid produces, and the conversion step that determines whether those hormones are usable.
Free T4 (the main hormone the thyroid releases) and free T3 (the active form that cells use, largely converted from T4 in peripheral tissues) can be abnormal even when TSH is within range. Some women have TSH in the normal range but free T3 on the low end, which can correlate with fatigue, cold intolerance, hair shedding, and the constellation of symptoms typically associated with hypothyroidism.
Reverse T3 is a less common add-on but relevant under chronic stress or illness - it's an inactive form of T3 that competes with active T3 at the cellular level. High reverse T3 relative to free T3 can suggest the body is shunting thyroid hormone into an unusable form, often as a response to metabolic stress.
Thyroid antibodies (TPO antibodies and anti-thyroglobulin antibodies) identify Hashimoto's thyroiditis, an autoimmune condition that's the most common cause of hypothyroidism in women. You can have Hashimoto's with a normal TSH, particularly early in the disease. Identifying it early matters because the thyroid destruction is progressive.
How to ask: "I'd like a full thyroid panel including free T3, free T4, and thyroid antibodies along with my TSH. I've been experiencing fatigue and want a more complete picture of thyroid function."
Vitamin D (25-OH)
This one has become more mainstream, but it's still commonly omitted. The relevant test is 25-hydroxyvitamin D (25-OH D), which reflects your stored vitamin D status. Not the active form (1,25 OH D), which is regulated independently and less informative for screening.
Vitamin D deficiency is remarkably common, particularly in northern latitudes, among people who work indoors, and in women with darker skin tones (melanin reduces cutaneous vitamin D synthesis). Deficiency correlates with fatigue, muscle weakness, mood disturbance, poor immune function, and bone loss over time.
The reference range "normal" on most lab reports is 30-100 ng/mL. Many practitioners who specialize in this area prefer levels between 40-60 ng/mL for functional optimization, though that's a discussion worth having with your doctor rather than a self-dosing recommendation.
If you're below 30, supplementation is almost certainly indicated. What dose depends on your level and body weight.
How to ask: "Can you add a 25-OH vitamin D level to my panel? I know it's not always included in the standard draw."
Ferritin (not just hemoglobin)
Standard blood counts include hemoglobin and hematocrit, which reflect the amount of iron incorporated into red blood cells right now. Normal hemoglobin means you don't have anemia as currently defined.
What it doesn't tell you is how depleted your iron stores are.
Ferritin is the storage form of iron. You can have completely normal hemoglobin while running on nearly empty ferritin stores - your body prioritizes making red blood cells and will deplete storage iron to do so. By the time anemia shows up, you've often been running on fumes for a while.
Low ferritin (below roughly 30 ng/mL, with many practitioners preferring above 50-70 for women who are symptomatic) is strongly associated with fatigue, hair shedding, reduced exercise capacity, impaired cognition, and poor cold tolerance. Menstruating women, women with heavy periods, vegetarians, and frequent blood donors are at particular risk.
Hair loss is one of the most common symptoms of low ferritin that gets missed because the ferritin isn't being tested. Dermatologists who specialize in hair often order ferritin as a matter of course.
How to ask: "I'd like ferritin included - I've heard that ferritin can be low even with normal hemoglobin, and I've been experiencing some fatigue and hair shedding."
Fasting insulin (not just fasting glucose)
Fasting glucose tells you your blood sugar at a single moment after overnight fast. A normal fasting glucose is genuinely useful information. But insulin resistance - the metabolic state that precedes both type 2 diabetes and a host of other problems - can be present for years before fasting glucose becomes abnormal.
Fasting insulin measures how much insulin your pancreas is producing to keep blood sugar normal. If your body has become less sensitive to insulin (insulin resistance), the pancreas compensates by producing more. Fasting glucose stays normal for years while insulin quietly climbs.
Elevated fasting insulin (above roughly 10-15 uIU/mL, though optimal values are debated) is associated with increased risk of type 2 diabetes, polycystic ovarian syndrome (PCOS), weight that's resistant to diet changes, elevated triglycerides, and cardiovascular risk.
The HOMA-IR calculation (a formula using fasting glucose and fasting insulin) gives a more useful metabolic snapshot than glucose alone and is simple for your doctor to calculate from the two values.
This is particularly relevant for women with PCOS, a history of gestational diabetes, a family history of type 2 diabetes, or weight that is disproportionately carried in the abdomen.
How to ask: "I'd like fasting insulin along with my fasting glucose this year. I want to calculate HOMA-IR to get a better picture of insulin sensitivity."
hs-CRP (high-sensitivity C-reactive protein)
CRP is a marker of systemic inflammation. Standard CRP tests are designed to detect acute infection or significant inflammation at high levels. The high-sensitivity version (hs-CRP) measures lower-grade chronic inflammation, which is far more relevant to long-term health risk.
Chronic low-grade inflammation underlies cardiovascular disease, metabolic disease, autoimmune conditions, and is increasingly linked to depression and cognitive decline. An hs-CRP above 3 mg/L (with optimal being below 1) indicates elevated background inflammation.
The test doesn't tell you what's causing the inflammation - it's a signal that something is driving immune activation, which could be diet, visceral fat, chronic infection, autoimmune activity, or significant psychological stress. But it gives you a baseline and a reason to investigate further if elevated.
For women specifically, hs-CRP is part of the calculation in cardiovascular risk algorithms like the Reynolds Risk Score, which is considered more accurate for women than older risk models that didn't include this marker.
How to ask: "Can you add hs-CRP to my lipid panel this year? I'd like a baseline inflammation marker."
DHEA-S
DHEA (dehydroepiandrosterone) is produced mainly by the adrenal glands and is a precursor to both estrogen and testosterone. DHEA-S is the sulfate form - more stable in the bloodstream and the standard way to measure DHEA status.
DHEA-S declines naturally with age, beginning around the late 20s and dropping substantially by the 50s. Low DHEA-S has been associated with fatigue, low libido, mood changes, and reduced ability to tolerate stress - though the literature is more nuanced than the supplement industry suggests.
It's worth testing if you're experiencing significant fatigue and mood changes that haven't been explained by thyroid, ferritin, or vitamin D status. It's also useful context when evaluating adrenal function more broadly.
DHEA supplementation is available over the counter in many countries, but it's not something to self-prescribe - DHEA converts to both estrogen and testosterone and can have real hormonal effects. Testing first, then discussing with your doctor, is the right order.
How to ask: "I'd like DHEA-S tested as part of evaluating my adrenal hormone picture."
Sex hormone binding globulin (SHBG)
This one is less known but matters quite a bit for understanding how your sex hormones are actually functioning.
SHBG is a protein produced by the liver that binds to estrogen and testosterone in the bloodstream. Only the "free" (unbound) fraction of those hormones is biologically active. You can have total estrogen or testosterone in the normal range on paper while having very low free levels if SHBG is high - or you can have normal total levels but higher free fractions if SHBG is low.
Low SHBG is associated with insulin resistance and elevated androgens (relevant in PCOS). High SHBG is associated with oral contraceptive use (the pill strongly increases SHBG), thyroid disease, and some cases of low libido where total testosterone looks fine but free testosterone is actually quite low.
If you're on or recently off hormonal contraception and experiencing changes in libido, mood, or energy, SHBG can be an informative piece of the picture.
How to ask: "I'd like SHBG alongside any hormone testing - I want to understand my free hormone levels, not just total."
How to approach this conversation
Arriving at a doctor's appointment with a list of specific tests can feel uncomfortable if you're worried about seeming demanding or distrustful. A few things worth keeping in mind:
You are entitled to request tests. Physicians may have clinical reasons to decline (if there's no indication, insurance won't cover it, or the result wouldn't change management). That's a legitimate conversation. But "it's not on the standard panel" is not the same as "there's no reason to run it."
Be specific about symptoms. Rather than asking for tests in a vacuum, connect each request to something you're experiencing. Fatigue and hair loss make ferritin an obvious investigation. Symptoms consistent with thyroid dysfunction make a full panel reasonable. A family history of diabetes makes fasting insulin appropriate.
If your physician is dismissive without engagement, that's information. Asking whether a test is clinically indicated is a reasonable question. A dismissive non-answer is worth noting for next time.
Consider getting a copy of your own labs. Many patients never see the actual numbers - just a notification that everything was normal. Having your results in hand, with reference ranges, means you can track trends over time and have more specific conversations about what's shifting.
None of these tests replaces a proper clinical evaluation or makes you your own doctor. But going into an annual visit informed about what you want to understand, and why, is a completely reasonable use of that appointment.
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