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Melbourne, Australia

The Stockholm Hierarchy is a professional consensus created to define the preferred approaches to defining analytical quality. The quality of a laboratory measurement can also be classified by the quality of the limits that the value is compared with, namely reference interval limits and clinical decision limits. At the highest level in the hierarchy would be placed clinical decision limits based on clinical outcome studies. The second level would include both formal reference interval studies (studies of intra and inter-individual variations) and clinical decision limits based on clinician survey. While these approaches are commonly used, they require a lot of resources to define accurately. Placing laboratory experts on the third level would suggest that although they can also define reference intervals by consensus, theirs aren't as well regarded as clinician defined limits which drive clinical behaviour. Ideally both analytical and clinical considerations should be made, with clinicians and laboratorians both having important information to consider. The fourth level of reference intervals would be for those defined by survey or by regulatory authorities because of the focus on what is commonly achieved rather than what is necessarily correct. Finally, laboratorians know that adopting reference limits from kit inserts or textbook publications is problematic because both methodological issues and reference populations are often not the same as their own. This approach would rank fifth and last. When considering which so called 'common' or 'harmonised reference intervals' to adopt, both these characteristics and the quality of individual studies need to be assessed. Finally, we should also be aware that reference intervals describe health and physiology while clinical decision limits focus on disease and pathology, and unless we understand and consider the two corresponding issues of test specificity and test sensitivity, we cannot assure the quality of the limits that we report. Source

Farrance I.,RMIT University | Sikaris K.A.,Melbourne Pathology
Clinical Chemistry and Laboratory Medicine

There appears to be a growing debate with regard to the use of "Westgard style" total error and "GUM style" uncertainty in measurement. Some may argue that the two approaches are irreconcilable. The recent appearance of an article "Quality goals at the crossroads: growing, going, or gone" on the well-regarded Westgard Internet site requires some comment. In particular, a number of assertions which relate to ISO 15189 and uncertainty in measurement appear misleading. An alternate view of the key issues raised by Westergard may serve to guide and enlighten others who may accept such statements at face value. © 2016 by De Gruyter. Source

Yip L.,Royal Childrens Hospital | Darling S.,Melbourne Pathology | Orchard D.,Royal Childrens Hospital
Australasian Journal of Dermatology

We present a case series of childhood lymphomatoid papulosis (LyP), an entity which is commonly misdiagnosed and poorly described in the paediatric dermatology literature. Clinically and histologically, the features of LyP in children can mimic insect bite reactions, with prominent dermal neutrophils and eosinophils. However, CD30 immunohistochemical staining of atypical lymphocytes within a mixed inflammatory infiltrate should point to the diagnosis of LyP. There is no consensus to guide management of childhood LyP due to its rarity and largely unknown natural course. We discuss our experience with LyP in five children and the use of methotrexate to induce rapid resolution of persistent lesions and to reduce recurrences in two children. Although none of our cases have experienced malignant transformation to date, life-long monitoring is advocated. © 2011 The Australasian College of Dermatologists. Source

Paxton G.A.,Murdoch Childrens Research Institute | Sangster K.J.,Murdoch Childrens Research Institute | Maxwell E.L.,Melbourne Pathology | McBride C.R.J.,ISIS Primary Care | Drewe R.H.,ISIS Primary Care

Objective: To document the prevalence of nutritional deficiencies, infectious diseases and susceptibility to vaccine preventable diseases in Karen refugees in Australia. Design: Retrospective audit of pathology results. Setting: Community based cohort in Melbourne over the period July 2006-October 2009. Participants: 1136 Karen refugee children and adults, representing almost complete local area settlement and 48% of total Victorian Karen humanitarian intake for the time period. Main Outcome Measures: Prevalence of positive test results for refugee health screening, with breakdown by age group (<6 years, 6-11 years, 12-17 years, 18 years and older). Results: Overall prevalence figures were: anaemia 9.2%, microcytosis 19.1%, iron deficiency 13.1%, low vitamin B12 1.5%, low folate 1.5%, abnormal thyroid function tests 4.4%, vitamin D<50 nmol/L 33.3%, hypocalcaemia 7.4%, raised alkaline phosphatase 5.2%, abnormal liver transaminases 16.1%, hepatitis B surface antigen positive 9.7%, hepatitis B surface antibody positive 49.5%, isolated hepatitis B core antibody positive 9.0%, hepatitis C positive 1.9%, eosinophilia 14.4%, Schistosoma infection 7%, Strongyloides infection 20.8%, malaria 0.2%, faecal parasites 43.4%. Quantiferon-gold screening was positive in 20.9%. No cases of syphilis or HIV were identified. Serological immunity to vaccine preventable diseases was 87.1% for measles, 95% for mumps and 66.4% for rubella; 56.9% of those tested had seroimmunity to all three. Conclusions: Karen refugees have high rates of nutritional deficiencies and infectious diseases and may be susceptible to vaccine preventable diseases. These data support the need for post-arrival health screening and accessible, funded catch-up immunisation. © 2012 Paxton et al. Source

Knox J.,Melbourne Pathology | Jadhav S.,Swinburne University of Technology | Sevior D.,bioMerieux | Agyekum A.,University of Sydney | And 5 more authors.
Journal of Clinical Microbiology

We compared the diagnostic accuracy of the Carba NP test with that of a straightforward matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) method for detecting carbapenemase-producing Enterobacteriaceae (CPE). Using PCR as the reference method, both tests demonstrated a sensitivity of 87% and a specificity of 100%. MALDI-TOF MS offers a potential alternative for the rapid detection of CPE in the clinical laboratory setting. Copyright © 2014, American Society for Microbiology. All Rights Reserved. Source

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