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Hi Emma, I think a pragmatic approach has to be taken where the decision to repeat all or selected samples since the last QC fail depends on the concentration of such samples, which are evaluated against the level(s) at which the QC fail(s) has occurred. Identifying the failure point using a truncated critical difference formula can help to objectively and more precisely ID the failure point. The decision is not ad hoc and has been part of our laboratorys' protocols for some time and ISO 15189:2012 compliant. I extract from our papers (attached and below) which explain fuller. Hope that helps KR, Graham Dr Graham Lee PhD FRCPath Consultant Clinical Biochemist/UCD Assistant Clinical Professor Department of Clinical Biochemistry & Diagnostic Endocrinology Mater Misericordiae University Hospital and Cappagh National Orthopaedic Hospital, Dublin Midland Regional Hospital, Mullingar, University College Dublin Address: MMUH, Eccles St, Dublin 7 Tel:00353 1 8034983 Graham R. Lee Maria C. Fitzgibbon Paula O'Shea , (2016),"Laboratory services: regaining and maintaining control", International Journal of Health Care Quality Assurance, Vol. 29 Iss 5 pp. 507 -522 Graham R. Lee Maria C. Fitzgibbon Paula O'Shea , (2016),"In control? IQC consensus and statutory regulation", International Journal of Health Care Quality Assurance, Vol. 29 Iss 5 pp. 492 - 506 [cid:image001.png@01D29CD9.0D2D8910] From: Clinical biochemistry discussion list [mailto:[log in to unmask]] On Behalf Of TUDDENHAM, Emma (KINGSTON HOSPITAL NHS FOUNDATION TRUST) Sent: 13 March 2017 16:02 To: [log in to unmask] Subject: Re-running patient samples after IQC failure Dear collective brain, We are reviewing our processes ahead of UKAS inspection and were wondering if anyone has a policy in place for when to re-run patient samples after an IQC failure on random access chemistry/immunoassay platforms. For example, do you have a set rule that if IQC is >3SD out for an analyte (? on all levels, ? on one level) patient samples run on that analyser since last 'good' IQC are all re-checked? Or is this decision made on an ad-hoc basis? Is a written policy on this required for UKAS? Any thoughts and experiences on this topic gratefully received! Emma Emma Tuddenham Clinical Scientist Kingston Hospital Galsworthy Road Kingston Upon Thames KT2 7QB Tel: 0208 934 3309 Fax: 0208 934 3289 Please note: currently I work Mondays, Wednesdays and Thursdays only ******************************************************************************************************************** This message may contain confidential information. If you are not the intended recipient please inform the sender that you have received the message in error before deleting it. Please do not disclose, copy or distribute information in this e-mail or take any action in reliance on its contents: to do so is strictly prohibited and may be unlawful. Thank you for your co-operation. NHSmail is the secure email and directory service available for all NHS staff in England and Scotland NHSmail is approved for exchanging patient data and other sensitive information with NHSmail and GSi recipients NHSmail provides an email address for your career in the NHS and can be accessed anywhere For more information and to find out how you can switch, visit www.nhsdigital.nhs.uk/nhsmail<http://www.nhsdigital.nhs.uk/nhsmail> ******************************************************************************************************************** ------ACB discussion List Information-------- This is an open discussion list for the academic and clinical community working in clinical biochemistry. Please note, archived messages are public and can be viewed via the internet. Views expressed are those of the individual and they are responsible for all message content. ACB Web Site http://www.acb.org.uk Green Laboratories Work http://www.laboratorymedicine.nhs.uk List Archives http://www.jiscmail.ac.uk/lists/ACB-CLIN-CHEM-GEN.html List Instructions (How to leave etc.) http://www.jiscmail.ac.uk/ This e-mail and any files transmitted with it contain information which may be confidential and which may also be privileged and is intended solely for the use of the individual or entity to which it is addressed. Unless you are the intended recipient you may not copy or use it, or disclose it to anyone else. Any opinions expressed are that of the individual and not necessarily that of Mater Misericordiae University Hospital. ------ACB discussion List Information-------- This is an open discussion list for the academic and clinical community working in clinical biochemistry. Please note, archived messages are public and can be viewed via the internet. Views expressed are those of the individual and they are responsible for all message content. ACB Web Site http://www.acb.org.uk Green Laboratories Work http://www.laboratorymedicine.nhs.uk List Archives http://www.jiscmail.ac.uk/lists/ACB-CLIN-CHEM-GEN.html List Instructions (How to leave etc.) http://www.jiscmail.ac.uk/