⏳ Longevity Baseline

What this panel can settle, and by what logic

Thirteen markers bought by somebody with no complaint. The right way to read the list is not marker by marker but by how often each one is worth measuring, because that is what a baseline is for.

1. Measured once, ever: Lipoprotein(a) — Lp(a). It is largely genetically set, so one result stands for a lifetime and the argument for testing it at all is that knowing changes how hard everything else is managed Nurmohamed 2023. It is common, it is invisible to every other marker on this list, and most people who carry it have never been told.
2. Measured annually and read as a trend: ApoB (Apolipoprotein B), HbA1c (Hemoglobin A1c), Fasting Insulin, hs-CRP (High-Sensitivity C-Reactive Protein) and Cystatin C with eGFR. These five move with what you do. ApoB is the one to steer by, because it reflected residual risk better than LDL cholesterol did in treated patients Johannesen 2021.
3. Cystatin C with eGFR beside the creatinine on the Comprehensive Metabolic Panel (CMP) settles a question a single eGFR cannot. The two estimates disagree systematically in people who carry muscle, and the size and direction of the disagreement is itself informative about which estimate to trust Wang 2023. For a lifting population this is the difference between a decade-long false alarm and a real trend.
4. IGF-1 (Insulin-like Growth Factor 1) and Ferritin are the two nobody expects. IGF-1 positions you on the growth against longevity trade rather than diagnosing anything, and ferritin catches silent iron accumulation, which is one of the few genuinely modifiable things on this list that produces no symptoms until it has done damage.

What it cannot settle, and what would

It cannot screen for cancer, and this is what people believe annual bloodwork does. There is no marker on this list whose elevation reliably means a tumor or whose normality excludes one. Age-appropriate cancer screening — colonoscopy, mammography, cervical screening, low-dose CT for heavy smokers — is a separate set of tests with actual evidence behind it, and none of them is blood Bandovas 2022.

It cannot measure biological age. Thirteen markers of physiology are not a clock, and no arithmetic on them produces one that has been shown to change outcomes when acted on.

It cannot see plaque, which is the endpoint five of these markers are proxies for. A coronary artery calcium score measures the disease directly and discriminated events better than a polygenic risk score in two cohorts Khan 2023. In somebody asymptomatic over 45, that scan is a better marginal purchase than a fourteenth marker.

And in an asymptomatic person it will generate findings that are not diseases. Thirteen markers against reference intervals built from a healthy population means a meaningful chance of at least one out-of-range value by arithmetic alone. Broadening what counts as abnormal is a recognized driver of overdiagnosis Bandovas 2022, and the cost lands as follow-up tests, anxiety, and occasionally treatment for something that was never going to matter. The correct response to one mildly abnormal number in this context is usually to repeat it, not to act on it.

Draw conditions that decide whether the money is wasted

For a panel whose entire product is the trend, the draw conditions matter more than they do anywhere else on this site: an inconsistency between two years is indistinguishable from a change.

1. Same laboratory, same month, same conditions, every year. This is the single highest-value instruction on the page. In the Vitamin D Standardization Program's own multi-assay study, imprecision was acceptable across the board but mean bias was not uniform Wise 2021, so a Vitamin D (25-Hydroxy) of 28 ng/mL at one provider and 33 ng/mL at another is plausibly the same person on the same day.
2. Fast 9 to 12 hours. Fasting Insulin and the triglycerides on the Lipid Panel (Cholesterol, HDL, LDL, Triglycerides) are the two that fail without it, and both are on the annual-trend list.
3. Not within 2 weeks of illness and 48 hours of hard training. hs-CRP (High-Sensitivity C-Reactive Protein) and Ferritin both rise as acute-phase proteins, and a single inflamed draw inserts a spike into a decade of data.
4. No biotin for 3 days. IGF-1 (Insulin-like Growth Factor 1), Vitamin D (25-Hydroxy) and hs-CRP (High-Sensitivity C-Reactive Protein) are commonly run on streptavidin-based platforms, where supplement-level biotin biases sandwich and competitive assays in opposite directions Li 2020.
5. Lipoprotein(a) — Lp(a) is exempt from all of the above, and once you have it you never need it again Nurmohamed 2023.

How you would know it answered your question, and what each pattern means next

The output of this panel is not a decision; it is a starting line. Five patterns and what each one is worth.

• Lipoprotein(a) — Lp(a) elevated: the highest-value result on the page, and you never repeat it. It lowers the ApoB target for the rest of your life and it is the commonest reason to go and buy a calcium score Nurmohamed 2023 Khan 2023.
• ApoB (Apolipoprotein B) rising year on year inside the reference range: a trend is a finding even when every individual value is normal Johannesen 2021. Act on the third point, not the second.
• Cystatin C with eGFR eGFR normal with a low creatinine-based eGFR: muscle, not kidney Wang 2023. Stop repeating the creatinine estimate; the discordance has already answered you.
• One mildly abnormal value and twelve normal ones: repeat the one, at 6 to 8 weeks, before anything else happens. This is the branch where an asymptomatic person most often converts a statistical outlier into a diagnosis Bandovas 2022.
• All thirteen optimal: the correct next action is not another panel for 12 months. It is the tests this one cannot do — the age-appropriate cancer screening, and imaging if the Lipoprotein(a) — Lp(a) or family history warrants it Khan 2023. A repeat at 6 months will report the same thirteen numbers and the HbA1c (Hemoglobin A1c) will not have had time to move regardless Chen 2022.

Sources read for these sections

• Nurmohamed NS, et al. Considerations for routinely testing for high lipoprotein(a). Current Opinion in Lipidology 2023 · PMID 35942815
• Johannesen CDL, et al. Apolipoprotein B and Non-HDL Cholesterol Better Reflect Residual Risk Than LDL Cholesterol in Statin-Treated Patients. Journal of the American College of Cardiology 2021 · PMID 33736827
• Khan SS, et al. Coronary Artery Calcium Score and Polygenic Risk Score for the Prediction of Coronary Heart Disease Events. JAMA 2023 · PMID 37219552
• Wang Y, et al. Discordance Between Creatinine-Based and Cystatin C-Based Estimated GFR: Interpretation According to Performance Compared to Measured GFR. Kidney Medicine 2023 · PMID 37753251
• Bandovas JP, et al. Broadening risk factor or disease definition as a driver for overdiagnosis: A narrative review. Journal of Internal Medicine 2022 · PMID 35253285
• Chen Z, et al. Interpretation of HbA1c lies at the intersection of analytical methodology, clinical biochemistry and hematology (Review). Experimental and Therapeutic Medicine 2022 · PMID 36382101
• Wise SA, et al. Vitamin D Standardization Program (VDSP) intralaboratory study for the assessment of 25-hydroxyvitamin D assay variability and bias. Journal of Steroid Biochemistry and Molecular Biology 2021 · PMID 34010687
• Li D, Ferguson A, Cervinski MA, Lynch KL, Kyle PB. AACC Guidance Document on Biotin Interference in Laboratory Tests. J Appl Lab Med 2020 · PMID 32445355