What Blood Tests Should I Get? A Specialist's Framework
A practical framework for building a blood panel that answers real questions — what a standard physical covers, what it leaves out, and which additions change decisions.
Board-Certified Nurse Practitioner, Trained in Functional/Integrative Medicine and Bioidentical Hormone Balancing
Start with the question, not the test list
The most useful panel is the one built around what you are actually trying to learn. Screening for disease you may already have, understanding symptoms you are living with, and estimating risk decades out are three different jobs, and they call for different markers.
- Am I developing something quietly? — metabolic, cardiovascular, and inflammatory markers
- Why do I feel this way? — thyroid, hormones, iron, and nutrient status
- What is my long-term risk? — ApoB, lipoprotein(a), fasting insulin, hs-CRP
What a standard annual physical usually covers
A typical wellness draw includes a complete blood count, a comprehensive metabolic panel, a standard lipid panel, and often a TSH and hemoglobin A1C. That combination is genuinely valuable — it detects anemia, kidney and liver problems, established diabetes, and gross thyroid disease.
Its limitation is design, not quality. These tests are built to identify disease that has already arrived. They are not built to detect the physiology that precedes it by five to fifteen years.
The markers most often left out
| Marker | What it adds |
|---|---|
| Fasting insulin | Detects insulin resistance years before glucose or A1C move |
| ApoB | Counts atherogenic particles instead of estimating cholesterol mass |
| Lipoprotein(a) | Inherited, lifelong cardiovascular risk — measure once |
| hs-CRP | Low-grade inflammation, an independent axis of risk |
| Free T3, Free T4, Reverse T3, antibodies | Thyroid function and autoimmunity that TSH alone misses |
| Ferritin and iron studies | Iron stores deplete long before hemoglobin falls |
| Vitamin D, B12, magnesium, omega-3 index | Nutrient inputs behind energy, mood, and immunity |
| Sex hormones and SHBG | Context for energy, sleep, libido, mood, and body composition |
How to build a panel that is worth the draw
- 1.Keep the foundation: CBC, comprehensive metabolic panel, lipids, A1C.
- 2.Add the metabolic early-warning layer: fasting insulin and fasting glucose, so HOMA-IR can be calculated.
- 3.Add the cardiovascular layer: ApoB, and lipoprotein(a) once in your lifetime.
- 4.Add the inflammatory layer: hs-CRP, ideally when you have been well for a few weeks.
- 5.Add the thyroid layer if you have symptoms or family history: Free T3, Free T4, Reverse T3, TPO antibodies.
- 6.Add nutrient and hormone markers relevant to your age, sex, and symptoms.
- 7.Fast 8–12 hours, draw in the morning, and repeat under the same conditions so trends are real.
The step that matters most is interpretation
Ordering the right tests is only half of it. Reference ranges describe a broad population rather than an optimal state, and a result can sit comfortably inside a range while being far from where you feel and function well.
The goal isn't to catch your disease. It's to make sure it never gets that far.
Frequently asked questions
How often should I get blood work done?
For most healthy adults, an annual comprehensive panel is reasonable, with more frequent rechecks — often three to six months — after a meaningful change in diet, training, medication, or supplementation, so you can see whether the change worked.
Do I need to fast before blood tests?
Fast 8–12 hours if the panel includes insulin, glucose, or triglycerides. Water is fine. Keeping the conditions the same each time makes year-over-year comparison meaningful.
Can I order my own blood tests without a doctor?
In most of the United States, yes. ClearSignal panels are facilitated through an independent ordering physician, and results are personally reviewed by a board-certified nurse practitioner who provides a written educational report.
Want to see your own data?
Many of the cardiovascular, metabolic, and inflammatory markers discussed here are included in ClearSignal's Comprehensive Cardiometabolic Panel — with hormonal and nutrient markers available through our hormone and nutrient panels. Every panel is personally reviewed and translated into a written wellness plan.
Comprehensive Cardiometabolic Panel
79 biomarkers · $329
A full-spectrum cardiometabolic and inflammatory assessment — insulin, lipids, ApoB, inflammation, and the drivers behind fatigue, brain fog, and stubborn weight.
Keep reading
Biomarker guide
Fasting Insulin
Fasting insulin can be elevated for a decade before glucose or A1C ever move. It is one of the earliest, most actionable signals in bloodwork — and one of the most commonly skipped.
Biomarker guide
ApoB
ApoB counts the actual number of atherogenic particles in your blood. When LDL cholesterol and particle count disagree, ApoB is usually the one telling the truth.
Biomarker guide
Lipoprotein(a)
Lp(a) is largely genetic, stable across your lifetime, and an independent driver of cardiovascular and aortic valve risk. It needs to be measured once — and most people never have been.
Biomarker guide
hs-CRP
High-sensitivity C-reactive protein detects the low-grade, symptomless inflammation associated with cardiovascular disease, insulin resistance, and accelerated aging.
Biomarker guide
Free T3
TSH is a pituitary signal. Free T3 is the hormone actually doing the work in your cells — and the two do not always agree.
Biomarker guide
Ferritin
Ferritin reflects stored iron — and it is one of the clearest examples of a marker where being technically in range and being adequate are not the same thing.
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Preventative Blood Tests by Decade
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About the author
Erica Finnan, MSN, APRN-C
Board-Certified Nurse Practitioner, Trained in Functional/Integrative Medicine and Bioidentical Hormone Balancing
Founder, ClearSignal Health
Erica Finnan is a board-certified nurse practitioner trained in functional and integrative medicine and bioidentical hormone balancing. She personally reviews every ClearSignal lab report.
Read full author profileReferences
Medical Disclaimer
The content on this blog is provided for educational and informational purposes only. It is not intended to be, and should not be taken as, medical advice, diagnosis, or treatment.
Reading this content does not create a patient-provider relationship between you and ClearSignal Health, Erica Finnan, or any clinician affiliated with ClearSignal. Nothing here is a substitute for individualized care from a licensed healthcare professional who knows your health history.
ClearSignal Health's specialist-led lab review service is a separate, dedicated offering — distinct from this blog — designed to give you an in-depth, personalized interpretation of your own results. If you have specific questions about your health, your labs, or a condition mentioned in this article, please consult your own healthcare provider or order a review through ClearSignal.
Always seek the guidance of a qualified healthcare provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay seeking it because of something you've read here.