The 5 Blood Tests Your Doctor Is Not Ordering

If you've had a "complete" physical in the last few years and still felt off, you're not imagining it. The standard panel most doctors run is built around insurance and basic disease screening - not around catching the early hormone, metabolic, and inflammation shifts that quietly drive how you feel and how you age. By the time those basic tests look abnormal, the problem has often been building for years.

None of the five tests below are exotic. They're widely available and well-supported by research. They just aren't routine, mostly because insurance doesn't push for them. If you've ever been told your labs are "normal" while you still feel unwell, this is the companion piece to why your labs look normal but you feel terrible.

1. ApoB - the real measure of heart risk

ApoB (apolipoprotein B) counts the actual number of cholesterol particles that can clog your arteries. A standard cholesterol test measures the amount of cholesterol; ApoB counts the particles carrying it - and the particle count is what predicts heart attacks. Two people can have the same "LDL cholesterol" but very different ApoB and very different risk. Heart and cholesterol experts now prefer it. A good target is under 90 (the unit is mg/dL), and lower if you already have heart risk.

2. Fasting insulin - catches blood-sugar trouble years early

Most panels check blood sugar but not insulin - the hormone that controls it. Fasting insulin shows how hard your body is working to keep sugar normal. It rises years (often a decade) before blood sugar itself looks abnormal, so it's an early warning for insulin resistance (when your body stops responding well to insulin). Many adults have a high fasting insulin while their glucose still looks fine. A good target is under about 8 (the unit is µIU/mL).

3. A full thyroid panel - not just TSH

The usual thyroid screen is one number (TSH). A useful panel checks several: the active thyroid hormones (free T3 and free T4), a "brake" hormone (reverse T3), and two antibodies that reveal early autoimmune thyroid disease. About 1 in 7 women have positive thyroid antibodies with a "normal" TSH - meaning early thyroid disease with real symptoms, dismissed as fine. A good target is active thyroid hormones in the upper half of the range and negative antibodies.

4. hs-CRP - a window into hidden inflammation

hs-CRP (high-sensitivity C-reactive protein) is a simple blood test for body-wide inflammation. Quiet, long-running inflammation is linked to heart disease, memory decline, metabolic problems, and faster aging - and it's a common, missed cause of feeling run-down. A good target is under 1.0 (the unit is mg/L).

5. A full set of sex hormones

A real hormone workup checks more than one number: estrogen, progesterone, total and free testosterone, SHBG, DHEA-S, and the pituitary signals FSH and LH. Sex hormones start sliding in your late thirties, and the standard "hormone check" (often just TSH plus maybe one hormone) misses it. The free numbers, read alongside SHBG (the protein that holds onto your hormones), are what actually match your symptoms - and they tie directly to fatigue after 40 and brain fog.

What I see in clinic: when a patient finally gets all five, the "mystery" usually isn't a mystery anymore - it's a high fasting insulin, a thyroid antibody, or a low free testosterone that no one had checked. Persistent brain fog and low energy are frequently part of that picture, which is why our brain fog and fatigue program is often the next step.

What a full Arbour workup includes

• Hormones: estrogen, progesterone, total/free testosterone, SHBG, DHEA-S, FSH, LH, prolactin
• Thyroid: TSH, free T3, free T4, reverse T3, and antibodies
• Metabolic: fasting glucose, fasting insulin, HbA1c
• Heart: standard cholesterol, ApoB, lipoprotein(a), hs-CRP, homocysteine
• Nutrients: vitamin D, B12, ferritin (iron stores), magnesium

Frequently Asked Questions

Will insurance cover these tests?

It varies. ApoB, fasting insulin, and the full thyroid panel often aren't covered by a routine preventive visit. We'll help you decide which to run through insurance and which to pay for directly. HSA and FSA accounts usually work.

What if my results come back "normal"?

Normal isn't the same as optimal. An hs-CRP of 2.5 or a fasting insulin of 12 can be "in range" but still not ideal. We read the whole pattern against your symptoms, not one number at a time.

How often should I run these?

For most people, once to set a baseline and then yearly, or sooner if you're actively treating something like insulin resistance or a hormone imbalance.

Do I need to fast?

Yes for the insulin and glucose tests - typically 8 to 12 hours, water only. We'll give you exact prep instructions when we order your panel.

Arbour Longevity · 2217 Packard St #15, Ann Arbor, MI 48104 · (734) 436-3357 · Thursday through Monday, 10am to 7pm.

References

1. Sniderman AD, Thanassoulis G, et al. (2019). Apolipoprotein B and Cardiovascular Disease. JAMA Cardiology.
2. Ridker PM. (2016). A Test in Context: High-Sensitivity C-Reactive Protein. JACC.
3. Xu Y, et al. (2023). Optimal healthy ranges of thyroid function. Lancet Diabetes & Endocrinology.
4. Bhasin S, Brito JP, et al. (2018). Testosterone Therapy in Men With Hypogonadism: Endocrine Society Guideline.
5. The 2022 Hormone Therapy Position Statement of The Menopause Society. Menopause.

This article is educational and does not replace individualized medical advice.