Overview
Viral serology detects host antibodies (and in some algorithms viral antigens in serum/plasma) to assess exposure, immune status, or support acuity, distinct from direct detection of virus in the symptomatic site.
Classification
| Component | Role | Limit |
|---|---|---|
| Screening immunoassay | High sensitivity detection | False reactives possible |
| Supplemental / confirm | Improve specificity | Virus-specific algorithms |
| IgM | Recent response cue | Persistence / cross-reactivity |
| IgG | Remote / vaccine / convalescence | Not “virus now” alone |
| Avidity (selected) | Recent vs remote IgG support | Availability varies |
Morphologic Features
Not morphologic, immunoassay signals, indices, and blot band patterns (when used) are the laboratory outputs.
Laboratory Characteristics
- Preliminary vs confirmed LIS states
- Interference / RF / hemolysis rules
- Paired-sera logistics when required
- Public-health reporting triggers, local lists
Reference Intervals
Index cutoffs, gray zones, avidity thresholds, and significant titer-rise definitions are assay- and laboratory-specific, verify IFU and SOP; do not treat textbook examples as universal.
Clinical and Laboratory Significance
Appropriate serology supports immune-status and exposure questions and, with confirmation/timing, acuity assessment for selected viruses, misuse causes false acute calls or missed windows.
Differential Considerations
Reactive IgM differentials: true recent infection, persistent IgM, cross-reactivity, polyclonal activation, interference. Resolve with confirm, repeat, avidity, or NAAT correlation per protocol.
Comparison Tables
IgM/IgG framing cues
| Pattern (conceptual) | Often suggests | Next habit |
|---|---|---|
| IgM− IgG− early illness | Window possible | Consider direct detection |
| IgM+ IgG− / rising | Recent response support | Confirm per SOP |
| IgM+ IgG+ screen | Needs nuance | Confirm / avidity / history |
| IgM− IgG+ | Remote / vaccine likely | Do not call acute on IgG alone |
Classification Frameworks
Not applicable.
Laboratory Notes
- Cross-link host-immune-response lesson for window biology
- Hedge blood-borne multi-step algorithms as current local SOP
- No treatment or dosing in serology teaching
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
- Forbes BA, Sahm DF, Weissfeld AS. Bailey & Scott's Diagnostic Microbiology. 15th ed. Elsevier; 2020.
- Mahon CR, Lehman DC, Manuselis G. Textbook of Diagnostic Microbiology. 6th ed. Elsevier; 2018.
- Carroll KC, Hobden JA, Miller S, et al. Jawetz, Melnick, & Adelberg's Medical Microbiology. 28th ed. McGraw-Hill; 2019.
- Murray PR, Rosenthal KS, Pfaller MA. Medical Microbiology. 9th ed. Elsevier; 2021.
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute. Performance Standards for Antimicrobial Susceptibility Testing. CLSI document M100 (verify current edition and institutional adoption).
- Centers for Disease Control and Prevention / NIH. Biosafety in Microbiological and Biomedical Laboratories (BMBL). Current edition (verify institutional adoption).
Frequently Asked Questions
Common questions about using this Serology foundational topics Medical Laboratory Library reference in Medical Laboratory Science education.
What is the Serology laboratory reference?
Serology is a Foundational Topics entry in the LabPedia Medical Laboratory Library, written for Medical Laboratory Science reference lookup.
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