Lab and culture reports
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This page explains how we use culture reports to confirm infections and pathogens.
- This is about identification of a clinical infection.
- For disorders believed to be infectious, we have a list of pathogens, and if the pathogen is never identified then you can use Infectious organism, unknown.
- Even if you do identify one or more organisms that are potential pathogens, usually it requires clinical correlation to decide whether it/they are actually pathogenic in this patient
- There are very few bugs that are always pathogenic (i.e. causing an infectious disease) -- high on this list is M.Tb. and Legionella. Even organisms like Aspergillis can be colonizers.
- Thus identifying whether a potential pathogen is in fact acting as a pathogen in a given patient requires clinical correlation.
- Having said that:
- While it is strongest to have a lab sample (fluid or tissue) from which the organism has been cultured, there are circumstances where this isn't necessary, e.g. Infection with implied pathogen
- Even a lab identification may not be from culturing -- e.g. there are monoclonal antibody and other non-culture methods such as antigen identification (e.g. Legionella urinary antigen) that can identify the presence of a bug
- The question arises of whether when you do NOT have any sort of lab identification of a bug, whether clinical suspicion is enough to "call it":
- Again, the answer is generally "Yes" with Infection with implied pathogen, and generally "No" elsewise -- deviating from these generalities can be done if you've got an excellent, scientific rationale.
How and when infections are identified is relevant to Attribution of infections.