Nashville BiohackingWith Scott Crosbie

Standard vs. Functional Bloodwork

A standard physical and a functional biomarker panel sound similar but ask different questions. The standard panel screens for disease against population averages. The functional panel measures how your systems are actually functioning against optimal ranges. The difference is the difference between 'not sick' and 'thriving.'

Option A

Standard Bloodwork (Annual Physical)

10-15 markers tested at your physician's annual visit, evaluated against population reference ranges designed to catch disease.

Option B

Functional Biomarker Panel

40-80+ markers across metabolic, hormonal, inflammatory, nutritional, and cardiovascular systems, evaluated against optimal ranges for vitality.

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Side by Side

How they compare on the details that matter.

AttributeStandard Bloodwork (Annual Physical)Functional Biomarker Panel
Markers Tested10-15 (CBC, basic metabolic, lipids, TSH, A1c)40-80+ across all major systems
Reference Range UsedPopulation average — designed to catch diseaseOptimal range — calibrated for vitality and longevity
Hormones TestedUsually just TSH (thyroid)Full thyroid + testosterone (total + free) + estrogen + progesterone + DHEA + SHBG + cortisol
Cardiovascular MarkersTotal cholesterol, HDL, LDL, triglyceridesPlus ApoB, Lp(a), homocysteine, hs-CRP, fibrinogen
Inflammatory MarkersRarely includedhs-CRP, homocysteine, ferritin, fibrinogen
Nutrient StatusMaybe vitamin D and B12Plus iron panel, magnesium, zinc, omega-3 ratio, methylation markers
Insurance CoverageYes, with annual physicalPartial — many markers covered, specialty markers often out-of-pocket
Review FormatBrief discussion of abnormal resultsComprehensive 45–60 minute review of every marker and what it means for you
Re-Testing CadenceAnnualEvery 6-12 months for tracking; 8-12 weeks when running a new protocol

Which to Pick

The honest recommendation.

Pick Standard Bloodwork (Annual Physical)

Standard bloodwork alone is fine if you're feeling great, performing well, recovering normally, and have no specific concerns to investigate.

Pick Functional Biomarker Panel

Choose functional testing if you're investing in proactive longevity, troubleshooting persistent symptoms with normal labs, optimizing performance, or running specific protocols (hormones, weight loss, supplementation).

Do Both

Run both. Standard at your annual physical (insurance-covered, disease-screening) plus a functional panel every 6-12 months (optimization-focused). The two answer different questions.

Common Questions

Questions about the comparison.

Isn't a standard physical enough?

It's enough to catch overt disease, which is what it was designed for. It's not designed to tell you why you feel tired, why your recovery is slow, why your body composition isn't responding, or whether your hormones are truly in the range associated with vitality. Functional testing answers those questions.

Why are 'normal' ranges different in functional medicine?

Standard reference ranges are calculated from population averages — including a lot of people who are tired, inflamed, or pre-diabetic. Functional ranges are calculated from people who are actively thriving. Example: TSH normal range is roughly 0.4-4.5; functional optimal is 1.0-2.5. Many people fall in the 'normal' range and still feel terrible.

Does insurance cover functional bloodwork?

Some markers — yes, the same ones covered in standard physicals. Specialty markers (hormones at the level of detail functional medicine uses, advanced cardiovascular markers, comprehensive nutrient panels) are often out-of-pocket. Most clinics will tell you the expected out-of-pocket cost in advance.

Should I stop seeing my regular doctor?

No. Standard medicine is essential for acute issues, disease management, surgical care, and emergencies. Functional testing supplements it — adding the 'is everything functioning optimally?' layer that traditional care often doesn't have time for. Many of the most optimization-focused members maintain both relationships.

Try Both at Next Health

Both available at both locations.