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20 th International AIDS Conference | 24 July 2014 1 |1 | Protecting the quality of HIV testing in the new HIV testing environment 20 th International.

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Presentation on theme: "20 th International AIDS Conference | 24 July 2014 1 |1 | Protecting the quality of HIV testing in the new HIV testing environment 20 th International."— Presentation transcript:

1 20 th International AIDS Conference | 24 July |1 | Protecting the quality of HIV testing in the new HIV testing environment 20 th International AIDS Conference 24 July 2014, Melbourne Anita Sands Prequalification Team – Diagnostics Department of Essential Medicines & Health Products 20 th International AIDS Conference 24 July 2014, Melbourne Anita Sands Prequalification Team – Diagnostics Department of Essential Medicines & Health Products

2 20 th International AIDS Conference | 24 July |2 | Background Quality of all HIV testing is a priority –Incorrect HIV testing results will occur without a framework to guide quality of testing 3 C's to the 5 C's –Consent –Confidentiality –Counselling –Correct test results –Connection/linkage to prevention, care and treatment

3 20 th International AIDS Conference | 24 July |3 | Where to deliver HIV testing Universal access to HTC Community based HTC Home-based Quality standards for all HTC settings Facility based HTC Outreach (key pop) Events Workplace Schools PITC Clinical settings PITC Clinical settings Other facilities e.g. stand-alone VCT

4 20 th International AIDS Conference | 24 July |4 | Framework for quality of HIV testing Selection of testing strategy List of prequalified diagnostics National testing and QA policies Validation of testing algorithm(s) Procurement of diagnostics Post-market surveillance National regulatory framework for diagnostics Training Quality assurance Supported by Guided by

5 20 th International AIDS Conference | 24 July |5 | WHO Prequalification of Diagnostics Pre-submission form Dossier review Site inspection Laboratory evaluation Dossier incomplete Prequalification decision Dossier complete Dossier screening Priority product Yes No

6 20 th International AIDS Conference | 24 July |6 | Framework for quality of HIV testing Selection of testing strategy List of prequalified diagnostics National testing and QA policies Validation of testing algorithm(s) Procurement of diagnostics Post-market surveillance National regulatory framework for diagnostics Training Quality assurance Supported by Guided by

7 20 th International AIDS Conference | 24 July |7 | Testing strategy for diagnosis: high prevalence >5% Result: A1- Report: HIV negative Result: A1- A2- Report: HIV negative Result: A1+ A2- Result: A1+ A2- A3+ Report: HIV inconclusive Result: A1+ A2- A3- Report: HIV negative Conduct A2 Result: A1+ A2+ Report: HIV positive Conduct A1 Result: A1+ Conduct A3 Result: A1+ A2- Repeat A1 and A2 Source: HIV Assays Report _eng.pdf

8 20 th International AIDS Conference | 24 July |8 | Testing strategy for diagnosis: low prevalence <5% Result: A1- Report: HIV negative Result: A1+ A2 - Report: HIV negative Result: A1- A2 - Report: HIV negative Result: A1+ A2 + Result: A1+ Result: A1+ A2 - Repeat A1 and A2 Result: A1+ A2+ A3+ Report: HIV positive Result: A1+ A2+ A3- Report: HIV inconclusive Conduct A2 Conduct A3 Conduct A1 Source: HIV Assays Report _eng.pdf

9 20 th International AIDS Conference | 24 July |9 | Framework for quality of HIV testing Selection of testing strategy List of prequalified diagnostics National testing and QA policies Validation of testing algorithm(s) Procurement of diagnostics Post-market surveillance National regulatory framework for diagnostics Training Quality assurance Supported by Guided by

10 20 th International AIDS Conference | 24 July | Validation of testing algorithms How to chose the assays to be used as Assay 1, Assay 2, and Assay 3? Assay 1 = most sensitive –Assay 2 and Assay 3 = most specific –Poor choice of Assay 2 and 3 may lead to high rates of misclassification Defined national testing algorithms –With back-up options in case of stock-outs or product failures

11 20 th International AIDS Conference | 24 July | (Un) clear test instructions Example of HIV diagnostic rapid test procedure: 1.Using one of the disposable pipettes supplied, fill with specimen. 2.Holding the pipette over the specimen well, add two drops of specimen (approx. 50μl). 3.Add 2 drops of buffer (approx. 60μl) to specimen well. 4.Allow 5 – 20 minutes from the time of buffer addition for the reaction to occur. For strongly positive results, the test line may become visible earlier. It is advisable to wait the full 20 minutes for negative results.

12 20 th International AIDS Conference | 24 July | Critical parts of test procedure Volume of specimen –Too little = reduced sensitivity Volume of buffer –Too much = test may overflow –Too little = specimen will not flow through the device Reading time –Too soon = high background –Too late = reduced specificity

13 20 th International AIDS Conference | 24 July | WHO post-market surveillance WHO is developing guidance for both reactive and proactive elements of post-market activities End-users, manufacturers, NRAs all have a role WHO prequalified product Reactive PMS Field Safety Notice Complaints Lot verification testing Proactive PMS Field Safety Corrective Action

14 20 th International AIDS Conference | 24 July | Framework for quality of HIV testing Selection of testing strategy List of prequalified diagnostics National testing and QA policies Validation of testing algorithm(s) Procurement of diagnostics Post-market surveillance National regulatory framework for diagnostics Training Quality assurance Supported by Guided by

15 20 th International AIDS Conference | 24 July | Quality assurance Using ISO as the standard and CLSI GP26- A4 as guidance External quality assessment (EQA) –Verifies the proficiency of the testing process Quality Control (QC) –Verifies the test is working correctly Process Control Quality Control & Specimen Management Purchasing & Inventory Assessment Occurrence Management Information Management Process Improvement Customer Service Facilities & Safety Organization Personnel Equipment Documents & Records

16 20 th International AIDS Conference | 24 July | Assuring quality of community-based HTC Keep the service delivery model simple Community workers (operators) must be trained and proficient in specimen collection, test procedure, reading of results, and interpreting results Support from the laboratory is crucial Ensure linkage to treatment and care –For additional testing to confirm the diagnosis, and preferably at a site that performs treatment assessment i.e. CD4 count for ART initiation

17 20 th International AIDS Conference | 24 July | Framework for quality of HIV testing Selection of testing strategy List of prequalified diagnostics National testing and QA policies Validation of testing algorithm(s) Procurement of diagnostics Post-market surveillance National regulatory framework for diagnostics Training Quality assurance Supported by Guided by

18 20 th International AIDS Conference | 24 July | Training and proficiency Competency-based training Proof of proficiency with panel of HIV + and HIV - specimens –Proficiency for the entire testing algorithm, not just test procedure Simple SOPs –Easy to read job aids

19 20 th International AIDS Conference | 24 July | WHO normative guidance WHO service delivery approaches to HTC: a strategic policy framework –http://apps.who.int/iris/bitstrea m/10665/75206/1/ _eng.pdf WHO handbook for improving HIV testing and counselling services –http://www.who.int/hiv/pub/vct/ /en/index.html

20 20 th International AIDS Conference | 24 July | WHO/CDC training package Training package –Participants manual –Trainers guides –Visual aids Requires local adaptation Undergoing revision


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