Blood Tests Every Health-Conscious Person Should Get Annually

Standard annual physicals typically check cholesterol, blood sugar, and a basic metabolic panel. That is a start — but for anyone serious about optimizing health, it leaves enormous gaps. The markers that predict cardiovascular disease, cognitive decline, fatigue, and nutrient deficiencies are rarely ordered unless you ask for them.

Here is a complete list of what to request, why it matters, and what optimal looks like versus the lab normal range.

Vitamin D (25-OH vitamin D)

Request the 25-hydroxyvitamin D test, not 1,25-dihydroxyvitamin D. The 25-OH form reflects your actual storage status. Lab normal is typically greater than 20 ng/mL, but most vitamin D researchers consider 40-60 ng/mL optimal. Deficiency below 20 ng/mL is associated with impaired immunity, bone loss, and mood disorders. Test in late winter — that is when levels are at their annual minimum.

Vitamin B12 and Methylmalonic Acid (MMA)

Serum B12 can appear normal while cellular B12 is depleted — especially in people taking acid-blocking medications or older adults with reduced intrinsic factor. Methylmalonic acid (MMA) is a functional marker: when B12 is insufficient at the cellular level, MMA rises. Optimal serum B12 is generally considered greater than 400 pg/mL, and MMA should be below 0.37 µmol/L.

Ferritin (not just hemoglobin)

Ferritin measures iron storage, while hemoglobin only reflects anemia — a late-stage consequence of depletion. You can have severely depleted iron stores and a normal hemoglobin for months. Ferritin below 30 ng/mL is associated with hair loss and fatigue even without anemia; below 70 ng/mL may impair cognitive function. The lab normal range (as wide as 12-300 ng/mL in women) is not the same as optimal.

Magnesium (RBC, not serum)

Serum magnesium is one of the least useful nutritional tests in medicine — the body maintains serum levels by pulling from muscle and bone even as cellular stores deplete. Red blood cell (RBC) magnesium reflects intracellular status far more accurately. Optimal RBC magnesium is typically 5.2-6.5 mg/dL. Up to 60% of Americans are functionally magnesium-deficient on this measure.

Omega-3 Index

The omega-3 index measures EPA and DHA as a percentage of red blood cell fatty acids. Below 4% carries high cardiovascular risk; 4-8% is intermediate; above 8% is the low-risk zone. Most Americans sit around 4-5%. This test is available through OmegaQuant ($60-90 at-home kit) and is not typically ordered by conventional physicians.

Zinc

Plasma zinc is imperfect but useful when interpreted alongside symptoms. Low zinc affects immune function, wound healing, testosterone production, and taste and smell. Optimal plasma zinc is generally 80-120 µg/dL.

Homocysteine

Homocysteine is an amino acid that damages blood vessels and is strongly associated with Alzheimer's disease and cardiovascular events. Lab normal is typically less than 15 µmol/L, but optimal is below 8-10 µmol/L. It is modifiable: B12, folate, and B6 supplementation can lower homocysteine significantly. This test costs roughly $30 and is rarely ordered at standard visits.

hs-CRP (High-Sensitivity C-Reactive Protein)

hs-CRP measures low-grade chronic inflammation. Values below 1.0 mg/L indicate low cardiovascular risk; 1-3 mg/L is moderate; above 3 mg/L is high. Many people with normal cholesterol have elevated hs-CRP, which explains much of the residual cardiovascular risk in treated patients.

Fasting Insulin and Glucose (HOMA-IR)

Fasting glucose alone misses early insulin resistance in most cases. Adding fasting insulin allows calculation of HOMA-IR (glucose x insulin / 405). A HOMA-IR above 2.0 suggests insulin resistance; optimal is below 1.5. Fasting insulin ideally should be below 5 µIU/mL.

HbA1c

Hemoglobin A1c reflects average blood glucose over roughly 90 days. While useful, it misses postprandial glucose spikes and can be artificially low in people with hemolytic anemia. Optimal is below 5.3% for most people, though labs flag only above 5.7%.

Complete Metabolic Panel

The CMP covers kidney function (creatinine, BUN), liver enzymes (ALT, AST, alkaline phosphatase), electrolytes, and blood glucose. It is the baseline of baseline tests and should be on every annual panel.

Thyroid Panel (TSH, Free T3, Free T4)

TSH alone is standard but insufficient. Free T3 is the active hormone at the tissue level. Free T4 is what the thyroid secretes. Many people have normal TSH but poor T4-to-T3 conversion, which explains fatigue and brain fog with normal thyroid labs. Request all three.

Lipid Panel with Particle Size

Standard LDL is a calculated estimate. LDL particle number (LDL-P) or apolipoprotein B (ApoB) more accurately predicts cardiovascular risk — small, dense LDL particles are far more atherogenic than large, buoyant ones. Many labs offer expanded lipid panels including these markers.

How to Ask Your Doctor

A useful framing: "I would like to order some additional nutritional markers to understand my baseline. Can we include ferritin, fasting insulin, homocysteine, and hs-CRP with my standard panel?"

If denied, most of these tests cost $15-60 each through direct-to-consumer services like Ulta Lab Tests, Any Lab Test Now, Walk-In Lab, or Marek Health. Vitamin D, homocysteine, and an omega-3 index through OmegaQuant can be done entirely without a physician order.

Optimal Ranges vs. Reference Ranges

The most important distinction in functional lab interpretation: reference ranges reflect the average sick population, not optimal health. Lab normal for ferritin includes values associated with hair loss. Lab normal for TSH includes values associated with clinical hypothyroid symptoms. Always compare your results to optimal ranges from the nutrition and functional medicine literature — not just the range printed on the lab report.

The bottom line

Requesting these 13+ markers annually gives you a complete picture of nutritional status, metabolic health, and cardiovascular risk — information that standard care simply does not provide.

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