Overview
An internal control (IC) is a specimen- or reaction-associated control that confirms process/amplification integrity (often including inhibition monitoring). Failed IC criteria make blank target channels unsafe to release as not detected.
Classification
| Control level | Typical question |
|---|---|
| Positive (run) | Can the assay detect target? |
| Negative / NTC (run) | Is unexpected target absent? |
| Internal / process (specimen) | Did this specimen reaction work? |
Morphologic Features
Not applicable, this entry covers molecular QC internal controls, not morphologic identification.
Laboratory Characteristics
- Review IC before releasing not-detected calls
- Design and pass/fail rules are assay-defined
- Document IC failures; do not silently override
Reference Intervals
Not applicable as a numeric reference interval. IC acceptance criteria are defined by the assay procedure and institutional SOP.
Clinical and Laboratory Significance
Internal controls protect patients from false-negative releases caused by inhibition or process failure. Invalid ≠ negative remains the core release rule.
Differential Considerations
Failed IC with blank targets may reflect inhibition, extraction failure, setup error, or specimen inadequacy. Follow SOP recovery pathways rather than guessing a clinical negative.
Comparison Tables
Internal-control checkpoints
| Pattern | Safe call | Unsafe call |
|---|---|---|
| Targets blank + IC pass | Not detected per assay rules | Overstate as absolute exclusion |
| Targets blank + IC fail | Invalid, hold/retest per SOP | Report negative |
| Run controls pass + IC fail | Specimen still invalid | Ignore IC because batch passed |
Classification Frameworks
Not applicable . WHO disease classifications do not define molecular internal-control QC.
Laboratory Notes
- IC = specimen/process question
- Invalid ≠ negative
- QC ≠ verification ≠ validation ≠ external assessment
References
Authoritative textbooks, guidelines, and reviews supporting this reference entry. Verify reference intervals, critical limits, and reflex criteria against institutional protocols and current guideline editions.
Textbooks
- McPherson RA, Pincus MR. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Elsevier; 2021. (Molecular diagnostics chapters, verify current edition.)
- Buckingham L. Molecular Diagnostics: Fundamentals, Methods, and Clinical Applications. 3rd ed. F.A. Davis; 2019. (Verify current edition.)
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute (CLSI). Consult current CLSI molecular method documents available through your laboratory, document numbers and editions change; do not treat any single CLSI title as universal.
- Institutional molecular laboratory SOPs, assay manufacturer instructions for use (IFU), and locally adopted accreditation requirements. Always verify current local practice.
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