Sample QC

DRAGEN TruSight Oncology 500 uses QC metrics to assess the validity of analysis for DNA libraries that pass contamination quality control. If the library fails one or more quality metrics, then the corresponding variant type or biomarker is not reported, and the associated QC category in the report header displays FAIL.

DNA library QC results are available in the MetricsOutput.tsv file. Refer to Metrics Output for details.

Metric
Description
Recommended Guideline Quality Threshold
Variant Class

CONTAMINATION_SCORE

The contamination score is based on VAF distribution of SNPs.

≤ 1227

All

MEDIAN_EXON_COVERAGE

Median exon fragment coverage across all exon bases.

≥ 1300

Small variant, TMB, Fusion, MSI

PCT_EXON_1000X

Percent exon bases with 1000x fragment coverage.

≥ 80.0

Small variant, TMB

GENE_SCALED_MAD

The median of absolute deviations normalized by gene fold change.

≤ 0.059*

CNV

MEDIAN_BIN_COUNT_CNV_TARGET

The median raw bin count per CNV target.

≥ 6.0

CNV

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