Phenotypic Resistance Confirmation
Phenotypic Resistance Confirmation - Related Videos
01:31
Confirmation Biases
0 Views •
2020
The confirmation bias is the tendency to focus on information that confirms our existing beliefs and ignore information that is inconsistent with our expectations. For example, if you think that your professor is not very nice, you notice all of the instances of rude behavior exhibited by the professor while ignoring the countless pleasant interactions he is involved in on a daily basis. Have you ever fallen prey to the confirmation bias, either as the source or target of such bias? Another...
08:46
Implementation of In Vitro Drug Resistance Assays: Maximizing the Potential for Uncovering Clinically Relevant Resistance Mechanisms
0 Views •
Cited by 2 •
2015
Drug resistance to targeted therapeutics is widespread and the need to identify mechanisms of resistance--prior to or following clinical onset--is critical for guiding alternative clinical management strategies. Here, we present a protocol to couple derivation of drug-resistant lines in vitro with sequencing to expedite discovery of these mechanisms.
01:34
Humane Euthanasia and Confirmation of Death in Rodents
0 Views •
2026
All animal procedures described here must be conducted in accordance with institutional animal ethics guidelines and approved by IACUC. All procedures must follow the principles of the 3Rs—Replacement, Reduction, and Refinement—and must be performed by trained personnel. Humane endpoints in rodents are predefined clinical, behavioral, or physiological indicators that signal an animal is experiencing significant pain, distress, or declining health. When these signs are observed, timely...
14:51
Pooled shRNA Library Screening to Identify Factors that Modulate a Drug Resistance Phenotype
0 Views •
Cited by 2 •
2022
High-throughput RNA interference (RNAi) screening using a pool of lentiviral shRNAs can be a tool to detect therapeutically relevant synthetic lethal targets in malignancies. We provide a pooled shRNA screening approach to investigate the epigenetic effectors in acute myeloid leukemia (AML).
08:41
Modeling Chemotherapy Resistant Leukemia In Vitro
0 Views •
Cited by 15 •
2016
The current report summarizes a protocol that can be utilized to model the influence of the bone marrow microenvironment niche on leukemic cells with emphasis placed on enrichment of the most chemoresistant subpopulation.
FAQs
Breakpoints provide the interpretive reference used to judge whether a measured response to an antimicrobial represents clinically meaningful resistance. Laboratories compare the observed inhibition zone or minimum inhibitory concentration with these established thresholds rather than interpreting the raw measurement in isolation. This standardization helps connect laboratory findings with treatment selection and supports consistent reporting across clinical testing settings.
A genetic marker may suggest that resistance is possible, but it does not by itself establish that the microorganism shows a measurable growth or survival response under antimicrobial exposure. Phenotypic Resistance Confirmation tests that response directly under defined conditions. This distinction helps separate suspected resistance from resistance with demonstrated laboratory significance, improving confidence in interpretation.
Two key measurements are the inhibition zone and the minimum inhibitory concentration. An inhibition zone reflects the area where antimicrobial exposure prevents visible growth, whereas the minimum inhibitory concentration represents the tested concentration associated with inhibition. Interpreting either measurement requires standardized conditions and comparison with established breakpoints, so the result reflects more than a single uncontextualized observation.
The workflow begins with a clinical isolate and the selection of relevant antimicrobial agents. The isolate is then exposed to standardized concentrations under defined testing conditions. Laboratory personnel assess growth using an inhibition-zone measurement, a minimum inhibitory concentration, or another supported growth assessment, and interpret the result against established breakpoints. This sequence verifies whether the suspected phenotype is demonstrated.
Confirmed resistance can guide selection of antimicrobial treatment by showing that a microorganism withstands a tested agent under standardized conditions. The result is particularly useful when clinicians must distinguish an effective option from an agent for which resistance has been demonstrated. In this way, laboratory confirmation contributes evidence for medical decision-making rather than relying only on suspected resistance.
Because the process documents resistance through standardized, interpretable laboratory results, it strengthens recognition of emerging drug-resistant pathogens. Aggregated findings can support surveillance by identifying resistance patterns that warrant attention. In healthcare settings, confirmed results may also inform infection-control decisions, helping distinguish situations that require action from those based only on an unverified genetic or clinical suspicion.