Analytical (=Technical) validation

The top of the image shows the tail of a preceding biomarker validity table, including:

• text about performance characteristics and a body of evidence that elucidates physiologic, toxicologic, pharmacologic, or clinical significance of test results;
• text about widespread agreement in the medical or scientific community;
• cross-validation/replication at different sites;
• examples including EGFR MUTATION, k-ras mutation.

Biomarker development process

discovery	Method development	Validation studies	Cross-validation consortium
	pre-validation; exploratory method validation; advanced method validation; in-study method validation

Analytical (=Technical) validation

Table Structure

Visible column headers:

parameter	definition	Method	Affected by	Acceptance criteria

Upper Rows

parameter	conservative transcription
Population range	Affected by: Healthy vs Disease status. Other cells are blank or not reliably readable.
Assay range	Affected by: assay working range dependent on the antibody reagents used. Acceptance criteria appears to say 80-120% of test concentration ?.
Standard curve	Row visible, content not reliably filled in this crop.

Sensitivity

subtopic	definition / notes	method	affected by	acceptance criteria / examples
LLOQ	LLOQ: LLOQ is considered as the minimum concentration of analytes which can be determined with a precision (CV%) of 20%.	Estimated by signal-to-noise ratio of 10:1, or 10 x sd / Slope according to OCR; formula needs manual check.	LLOQ is a term used in bioanalysis and it is equivalent to LOQ.	Acceptance text appears: At LLOQ, CV is between 20-25%. Small table has ASC (ng/mL) values 22.2, 7.41, 2.5, 0.82 and CV (%) values 7.0, 8.5, 9.0, 22.3; note says 0.82 is LLOQ.
LOD (limit of detection)	the lowest analyte concentration that can be distinguished from the assay background (blank).	Estimated by signal-to-noise ratio of 3:1, or 3.3 x Standard Deviation / Slope with suitable accuracy and precision. A displayed formula for LOD/LLD is present but should be checked from the image before reuse.	Embedded figure: Analytical Method Validation LOD and LOQ; surrounding text says 95% of values will exceed the previously defined LoB, and only 5% of low concentration samples will produce values below the LoB.	Korean note beside LLOQ/LOD should be manually verified.
signal-to-background ratio (S/B)	Formula displayed as S/B = mean signal / mean background in the image/OCR.
signal-to-noise ratio (S/N)	Formula displayed as S/N = (mean signal - mean background) / standard deviation of background in the image/OCR.		Text says signal-to-noise ratio is a better metric than signal-to-background because it accounts for variation in the background.
Z’-factor	A Molecular Devices URL is visible: https://www.moleculardevices.com/en/assets/app-note/br/better-metrics-for-comparing-instruments-and-assays#gref or similar.			URL suffix requires manual check.
Detection range	Notes include: the lowest standard to the highest standard, dynamic range, and LLOD-ULOD; Korean notes discuss sample type/standard testing.			Korean text needs manual verification.

Specificity / Selectivity / Accuracy

parameter	conservative transcription
Specificity	Method cell shows IC50. Affected-by text: the ability of the assay to clearly distinguish the analyte of interest from components that can alter assay results.
Selectivity	Affected-by text: the degree to which unrelated matrix components cause analytic interference.
Accuracy (=trueness)	Left definition: closeness between the true value & the experimental value; Korean note indicates values must match.

Accuracy: Spike & recovery

field	conservative transcription
title	Spike & recovery
notes	Korean notes indicate checking whether a value matches at one point and whether there is matrix interference; exact wording should be manually verified.
method	Spike and recovery: a known amount of recombinant protein is spiked (added) into a sample and run in the ELISA. The resulting concentration/recovery of the spiked material demonstrates whether the expected value can be measured accurately.
example	Example says if serum is spiked with known 1000 pg/ml recombinant human IL-2 but the spiked sample measures at 80 pg/ml, a factor in the serum sample may inhibit detection of IL-2 by antibodies used in the assay.
calculation note	Korean/English note: next result value (recovery) should be 100%; %Recovery = (3-1)/2; 3 is spike + analyte / spiked sample / spike + endogenous; 1 is analyte only / unspiked sample / endogenous only; 2 is spike only / spiked blank; sample diluent = blank.
acceptance criteria	80-120% recovery.

Accuracy: Dilution linearity

field	conservative transcription
title	Dilution linearity
definition	Ability, within a given range, to obtain test results directly proportional to the concentration/amount of analyte in the sample.
notes	Korean notes indicate values should match proportionally and relate to matrix interference; exact wording should be manually verified.
method	A spiked or unspiked sample is serial-diluted, such as 1:2, 1:4, and 1:8. If a sample does not exhibit linear dilution, this indicates a matrix component is interfering with accurate detection of a specific analyte at a given dilution.
MRD	MRD: the minimum magnitude of dilution to which a sample must be subjected to optimize accuracy and precision in an assay run with a specified standard and sample diluent. Another cell describes MRD as the dilution factor where change in concentration from previous dilution starts to be linear/constant and is between 80-120% of expected sample recovery.
example / figures	Example text and figures are partially visible. It discusses MRD established by testing neat unspiked sera and unspiked sera diluted 1/10 and 1/100 in dilution buffer from 6 donors, with background caused by non-specific antibody binding. Figure labels and citation details need manual verification.
acceptance / reference	Acceptance criteria area includes linear regression, r2 > 0.98, 20210825 Kamiguchi, and MRD of 4 is acceptable; text says below is a good example and references a %dilution linearity calculator. Exact citation/labels should be checked.

Parallelism

field	conservative transcription
title	Parallelism
definition	Calibrators of known concentrations to samples of unknown concentration; sample-dilution response curve is parallel to the standard-calibrator response curve; proportionality between endogenous biomarker and recombinant calibrator.
notes	Margin note says spike-recovery may be more important than parallelism.
method/interpretation	Parallelism indicates similar binding properties for the capture antibody to the endogenous biomarker and calibrator.
affected-by text	Two major factors that contribute to nonparallelism are: difference between immunoaffinity characteristics of calibrator reference material and unknown analyte; and matrix effects/variance among calibration curve matrix and study population matrix.
figures	Small plots/figures are visible, including an Eg: anderson 2021 note and a plot mentioning NLRP3 concentration; labels are not reliable enough for exact transcription.

Precision / Repeatability

The bottom of the image begins the next section:

parameter	conservative transcription
Precision	Left edge shows a continuation into Precision.
Repeatability	the closeness of agreement among results...; acceptance criteria visible at far right: CV (Coefficient of variation): 20%. The row continues beyond this crop/photo.

Uncertain Spans

• The page title/navigation in the prior fallback was corrected from Genetic prevalence to Analytical (=Technical) validation based on the image and status/nav evidence.
• Exact dense table values, formulas, graph labels, figure captions, citations, URLs, and Korean notes remain uncertain unless they are explicitly transcribed above as conservative text.
• The small LLOQ table appears to contain ASC (ng/mL) and CV (%) values, but the header may be ASC/A5C/similar; verify before using.
• The LOD/LLD formula, Molecular Devices URL, MRD example text, donor labels, and NLRP3/Anderson figure labels should be checked against higher-resolution crops or adjacent photos.
• Korean annotations are only partially captured; preserve image evidence and manually verify wording before using in final KB.