Canadian society of clinical chemists (CSCC) interim consensus guidance for testing and reporting of SARS-CoV-2 serology.

Clinical laboratories across the world are working to validate and perform testing for SARS-CoV-2 antibodies. Herein, we present interim consensus guidance for Canadian clinical laboratories testing and reporting SARS-CoV-2 serology, with emphasis on the capabilities and limitations of these tests and recommendations for interpretative comments in an effort to achieve harmonized laboratory practices. The consensus document provides a broad overview of topics including sample type and contamination risk; kinetics of antibody response to COVID-19 and the impact on serology testing; clinical utility of SARS-CoV-2 serology testing; clinical performance of commercial laboratory-based assays commonly deployed in North America; recommendations for interim reporting; utility of SARS-CoV-2 antibody testing for pediatric patients; and utility of point-of-care testing.

Candidate recommendations for protein electrophoresis reporting from the Canadian Society of Clinical Chemists Monoclonal Gammopathy Working Group.

Protein electrophoresis is commonly used as an aid in the diagnosis of monoclonal gammopathies and is performed in many laboratories in Canada and throughout the world. However, unlike many other diagnostic tests, there is limited guidance for standardization and neither guidance nor specific recommendations for clinical reporting of serum (SPE) or urine (UPE) protein electrophoresis and immunotyping available in the literature. Therefore, a Canadian effort was undertaken to recommend standards that cover all aspects of clinical reporting with an ultimate goal towards reporting standardization.

Effect of Temperature and Time on Fecal Hemoglobin Stability in 5 Fecal Immunochemical Test Methods and One Guaiac Method.

Context: - Although promising for colorectal cancer screening, hemoglobin (Hb) stability remains a concern with fecal immunochemical tests. This study implemented a novel, standardized method to compare Hb stability across various fecal immunochemical tests. The method can be used to inform decisions when selecting a kit for use in colorectal cancer screening.

A competitive chemiluminescent immunoassay for the sensitive measurement of apolipoprotein B100.

Objectives: We have developed a competitive chemiluminescent immunoassay for the sensitive measurement of apolipoprotein B100 (apoB) and conducted a preliminary evaluation of the method.

Design And Methods: In the assay, apoB-rabbit immunoglobulin G (IgG) conjugate competes with apoB in the sample for binding to acridinium N-hydroxysuccinimide labelled anti-apoB antibody. Goat anti-rabbit-IgG immobilized to magnetic particles is used to separate the apoB-rabbit IgG conjugate bound to the labelled anti-apoB antibody.

Low-density lipoprotein binding assay using the calf adrenocortical low-density lipoprotein receptor.

The low-density lipoprotein (LDL) receptor was purified to a semipure solubilized form from calf adrenocortical tissue. This receptor was found to be a suitable substitute for the human LDL receptor for studying human LDL binding. The apparent dissociation constant of the receptor from calf adrenocortical cells, using human LDL as the ligand, was found to be 8.