Cytotoxic Crossmatching (Scheme 2A)
UKAS Schedule of Accreditation, Accredited to ISO/IEC 17043:2010 Provider 8351
Complement Dependent Cytotoxic (CDC) Crossmatching
PURPOSE OF PROGRAMME:
To assess participants' ability to correctly determine cell/serum cytotoxoic crossmatch status
|Peripheral blood lymphocytes (PBL) and/or T-cells and/or B-cells with and/or without dithiothreitol (DTT) treatment of sera|
|Test results should be reported as positive or negative using established local criteria|
MATERIAL PROVIDED: Blood OR isolated lymphocyte preparations (non-UK participants only); serum
DISTRIBUTIONS PER YEAR: 5
SAMPLES PER DISTRIBUTION: 2x blood samples; 2x sets of four sera
FREQUENCY OF DISTRIBUTION: As per Distribution Timetable
PROGRAMME OF ANALYSIS:
Results should be submitted via online data entry. Results are expected to be returned within the specified reporting period (please refer to results deadline for each distribution on the UK NEQAS for H&I website or Participants Manual). The majority of UK NEQAS for H&I schemes are assessed on a consensus basis, therefore samples are distributed with the assigned value not being determined. Where a reference result is used, this testing is performed alongside or after the close of the EQA scheme. For these reasons UK NEQAS for H&I is unable to disclose results early.
The crossmatch status of each sample is determined by at least 75% of laboratories agreeing on the positivity or negativity of each cell/DTT combination. Crossmatching tests failing to reach the 75% consensus level will not be assessed. All PBL, T-cell, B-cell results with/without DTT treatment of sera are considered independently
Satisfactory performance is making 85% of reports in agreement with the consensus findings in a year for each cell/DTT combination registered
PERSISTENT POOR PERFORMANCE:
Laboratories not meeting the Satisfactory Performance criteria are deemed to have Unsatisfactory Performance and must complete a root cause, corrective and preventative action form.
Histocompatibility & Immunogenetics
The External Quality Assessment Scheme for Histocompatibility and Immunogenetics was founded in 1975 by Dr Heather Dicks and Dr Colin Entwistle at the National Tissue Typing and Reference Laboratory (NTTRL) based at Southmead Hospital in Bristol. In 1989 the Service became known as the UK National External Quality Assessment Service for Histocompatibility and Immunogenetics with Dr Peter Klouda as the service director and Mr Terry Ray as the service manager. The service relocated to a new host organisation in September 2000. UK NEQAS for Histocompatibility and Immunogenetics is now part of the Welsh Blood Service.