When is laboratory testing for Zika Virus infection reasonable? Testing algorithm for patients with and without symptoms.
WHO recommends replacing western blotting and line immunoassays with simpler tests in HIV testing services. These simpler tests include rapid diagnostic tests (RDTs) that can be used at the point-of-care, and enzyme immunoassays (EIAs).
These tests get results to the client faster, produce accura...te results more often, cost less, can be performed by various cadres of health providers, and can thus facilitate greater access and uptake of HIV testing services among those who need it most.
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This document updates recommendations for HIV testing by laboratories in the United States and offers approaches for reporting test results to persons ordering HIV tests and to public health authorities. The recommended algorithm is a sequence of tests used in combination to improve the accuracy of ...the laboratory diagnosis of HIV based on testing of serum or plasma specimens. The updated recommendations also include tests for HIV antigens and HIV nucleic acid because studies from populations at high risk for HIV demonstrate that antibody testing alone might miss a considerable percentage of HIV infections detectable by virologic tests
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Testing Algorithm. Interim Guidance
Testing Algorithm. Interim Guidance
HIV testing programmes need to ensure that all clients who test for HIV are provided with correct diagnoses. The accuracy of HIV testing is critical to prevent misdiagnosis, as the consequences of giving an incorrect test result can be serious for clients, HIV testing services, HIV programmes and pu...blic health.
With the evolution of global HIV epidemiology, HIV testing approaches must also evolve to maintain accuracy and efficiency in population-level diagnosis. Reports suggest that misdiagnosis of HIV status may occur when suboptimal testing algorithms and out-of-date testing strategies are used. As a result of changing epidemiology and declining HIV positivity in testing, WHO recommends all countries use a standard three-test strategy to ensure a PPV of at least 99%, minimizing false-positive misdiagnosis. The WHO-recommended HIV testing strategy, along with quality assurance measures such as retesting to verify a positive diagnosis prior to initiation of HIV treatment, is cost-effective as it prevents misdiagnosis and unnecessary initiation of costly lifelong treatment.
This implementation guide provides practical advice on switching to a three-test strategy and instituting other measures that can help national HIV programmes deliver high-quality, accurate HIV testing services and ensure that misdiagnosis is minimized.
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This policy brief describes key HIV viral load thresholds and the available viral load testing approaches for monitoring how well antiretroviral therapy is working for people living with HIV. It provides clarification for and elaborates upon the current treatment monitoring algorithm from the Consol...idated guidelines on HIV prevention, testing, treatment, service delivery and monitoring: recommendations for a public health approach.
This information can help people living with HIV to live healthy lives, ensure that HIV is not transmitted to other people and support policy-makers in determining the optimal allocation of resources for viral load testing and communicating the results.
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These guidelines provide new and updated recommendations on the use of point-of-care testing in children under 18 months of age and point-of-care tests to monitor treatment in people living with HIV; the treatment monitoring algorithm; and timing of antiretroviral therapy (ART) among people living w...ith HIV who are being treated for tuberculosis.
New recommendations launched today outline key new actions that countries can take to improve the delivery of HIV testing, treatment and care services by providing greater options for differentiated approaches such as, supporting HIV treatment start in the community, ensuring that children are diagnosed and treated early, and that viral load treatment monitoring is more accessible, focused and triggers clinical action
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These guidelines provide new and updated recommendations on the use of point-of-care testing in children under 18 months of age and point-of-care tests to monitor treatment in people living with HIV; the treatment monitoring algorithm; and timing of antiretroviral therapy (ART) among people living w...ith HIV who are being treated for tuberculosis.
New recommendations launched today outline key new actions that countries can take to improve the delivery of HIV testing, treatment and care services by providing greater options for differentiated approaches such as, supporting HIV treatment start in the community, ensuring that children are diagnosed and treated early, and that viral load treatment monitoring is more accessible, focused and triggers clinical action
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Accessed: 02.05.2020
These consolidated guidelines provide recommendations for comprehensive prevention and case management strategies in Kenya
Scope of the Guidelines: Infection prevention and control Patient triage Emergency Medical Services Case management Laboratory testing algorithm
Target... Audience: Health care workers taking care of patients suspected or confirmed to have COVID-19
These guidelines combine both preventive and clinical management of the disease in Kenyan context. The protocol borrows various international recommendations including the World Health Organization, from experience of other countries such as China that has struggled with the outbreak for a longer time and from principles of virology and infectious disease management.
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16 Dec. 2020
This document provides guidance to Ministries of Health (MOHs), laboratory personnel and implementing partners in African Union Member States on the application of rapid antigen tests to COVID-19 testing. The guidance serves as reference for policymakers, laboratory leads, implementing... partners, and experts on use case scenarios and associated testing algorithms for COVID-19 antigen tests. It recommends the use of antigen tests to increase access to testing and enable timely results for persons with or without symptoms in specific settings. The document will be reviewed and updated as more evidence becomes available regarding the use of rapid antigen tests for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) from global studies and evaluation efforts.
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This publication aims to provide updated guidance on the specific use of yellow fever laboratory assays in the context of surveillance to be used across the Global Yellow Fever Laboratory Network for disease surveillance. In the recent years, new commercial assays became available and are now recomm...ended for use by WHO and this publication will support national program on the use of compound laboratory assays as per the most recent recommended testing algorithms. This piece is aligned with the elimination effort set in the comprehensive global strategy to eliminate yellow fever epidemics (EYE) strategy 2017-2026 and where its advisory laboratory technical working group actively contributed to its development. The target audiences are policy-makers and health workers.
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The Practical manual on laboratory strengthening, 2022 update provides practical guidance on implementation of WHO recommendations and best practices for TB laboratory strengthening. It is an updated version of the GLI Practical Guide to Laboratory Strengthening published in 2017 and provides the la...test practical guidance on use of newly recommended diagnostics as well as guidance in key technical areas, including quality assurance and quality management systems, specimen collection and registration, procurement and supply-chain management, diagnostic connectivity, biosafety, data management, human resources, strategic planning, and model algorithms. The key changes are:
inclusion of recent or updated WHO recommendations for tests to diagnose TB and detect drug resistance;
alignment with the latest WHO critical concentrations for phenotypic drug-susceptibility testing (DST) and the new definitions of pre-XDR-TB and XDR-TB;
updated information on building quality-assured TB testing and management capacity using the Stepwise Laboratory Quality Improvement Process Towards Accreditation (SLIPTA) approach (Score-TB package1);
updated information on assessing, analysing and optimising TB diagnostic networks; and
updated information on the use of next-generation sequencing (NGS) to detect mutations associated with drug resistance for surveillance purposes.
The document also provides references to resources and tools relevant for work on laboratory strengthening.
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6 July 2021. Three new nucleic acid amplification test (NAAT) classes are endorsed by WHO and included.
The latest operational handbook includes the new classes recommended by WHO. It aims at facilitating the implementation of the WHO recommendations by the Member States, technical partners, and ot...hers involved in managing patients with TB and DR-TB. The operational handbook provides practical information on existing and new tests recommended by WHO, step-by-step advice on implementing and scale-up testing to achieve local and national impact and lastly, model diagnostic algorithms, which are updated to incorporate the latest recommendations. An overview of budgetary considerations and information sheets on each of the newly recommended tests is provided.
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orientaciones provisionales, 8 de noviembre de 2020
This interim guidance is most useful for countries interested in monitoring relative circulations of influenza and SARS-CoV-2 viruses. The document provides practical information to maintain surveillance of influenza and monitor SARS-CoV-2 using e...xisting surveillance systems. It contains updated considerations for addressing disruptions in the influenza sentinel surveillance and extending to include COVID-19 wherever possible. Updated algorithms for testing of both influenza and SARS-CoV-2 for surveillance are also included. This document is an update of Operational considerations for COVID-19 surveillance using GISRS and GISRS for the upcoming influenza seasons during the COVID-19 pandemic
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Diagnosing asthma in children represents an important clinical challenge. There is no single gold-standard test to confirm the diagnosis. Consequently, over- and under-diagnosis of asthma is frequent in children. A task force supported by the European Respiratory Society has developed these evidence...-based clinical practice guidelines for the diagnosis of asthma in children aged 5–16 years using nine Population, Intervention, Comparator and Outcome (PICO) questions. The task force conducted systematic literature searches for all PICO questions and screened the outputs from these, including relevant full-text articles. All task force members approved the final decision for inclusion of research papers. The task force assessed the quality of the evidence using the Grading of Recommendations, Assessment, Development and Evaluation (GRADE) approach.
The task force then developed a diagnostic algorithm based on the critical appraisal of the PICO questions, preferences expressed by lay members and test availability. Proposed cut-offs were determined based on the best available evidence. The task force formulated recommendations using the GRADE Evidence to Decision framework.
Based on the critical appraisal of the evidence and the Evidence to Decision framework, the task force recommends spirometry, bronchodilator reversibility testing and exhaled nitric oxide fraction as first-line diagnostic tests in children under investigation for asthma. The task force recommends against diagnosing asthma in children based on clinical history alone or following a single abnormal objective test. Finally, this guideline also proposes a set of research priorities to improve asthma diagnosis in children in the future.
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Testing Guidance and Interpretation of Results for Healthcare Providers
Zika Virus Testing Guidance: Asymptomatic Pregnant Women
with Possible Zika Virus Exposure
Testing Guidance and Interpretation of Results for Healthcare providers