Tag: proteomics

A working list of blood, molecular, and continuous biomarkers worth tracking on yourself, with the biological-variation math that tells you when a change is real and when it is noise.

A working guide to blood biomarker analysis for technically fluent readers: what a single result can and cannot tell you, how to separate biological variation from signal, and how to structure your own longitudinal data.

A functional biomarker measures how well a system is working — a ratio, a rate, or a response to a challenge — rather than a single resting concentration. Here is how to build them from CGM, blood panels, proteomics, and RNA-seq, and where they break.

List prices for SomaScan 7K and 11K at core facilities run $800–900 per sample before shipping, plate minimums, and analysis. Here is where that money goes, how the assay works, and how to decide between SomaScan, Olink Reveal, and a targeted panel.

A working guide to the five standard inflammation markers, from hs-CRP to IL-6. Covers what each tracks, noise in a single value and sample handling.

A Nature Medicine study staged 80 midlife women by hormone criteria and found 16 blood proteins that track the menopause transition better than age does. What the menopause proteomic score measures, how well it replicated, and what the dementia numbers do and do not support.

A glycan age score is a regression of IgG N-glycan peak ratios onto chronological age. Covers what the assay measures and how the number is built.

A plasma proteomics report measures the relative abundance of hundreds to thousands of circulating proteins. Here is what the numbers mean, how the three main platforms differ, and how to analyze your own data without fooling yourself.

A working setup for longitudinal biomarker tracking. Covers a schema that survives lab changes, reference change values and trend fitting.

A working guide to taking personal proteomics data from raw instrument files or NPX tables to a quantitative matrix, QC'd and normalized, and then to within-person statistics you can defend.

A step-by-step guide to taking a protein abundance matrix, building a defensible ranking statistic, and running over-representation and rank-based enrichment in R, including how to read a negative enrichment score.

A working guide to the Bioconductor DEP and DEP2 packages for one person's mass-spectrometry proteomics. Covers import, missing values and design.

A map of the multi-omics vendor market in four layers, what files each layer hands back, and how to evaluate a provider if you want data you can analyze yourself.

A direct look at what a maximal blood panel contains and which assays add real information. Covers marketing claims and getting the raw data.

A technical guide to choosing and using a biomarker testing service: what analytes are worth measuring, what the analytical error looks like, how to store and version the results, and where a clinician has to be involved.

Dehydration concentrates plasma by a few percent, which is far too small to explain most ALT and AST elevations. Here is what usually causes them, how to draw a clean measurement, and how to read enzymes against your own genomic and proteomic baseline.

A working pipeline for taking Olink, SomaScan, or DIA-NN output into R: QC, missingness, normalization, and longitudinal within-person modeling of a single individual's plasma proteome.

A technical read of the MPMD/Marek Health blood panel: which assays are chosen well, which markers mislead in trained people, how to control pre-analytic noise, and where a large chemistry panel stops telling you anything new.