An unusual case of reagent interference in transfusion medicine workup: Pan reactive indirect antiglobulin test caused by commercial saline solution.

Background: At the regional transfusion service in the Region of Southern Denmark, serological investigations are primarily carried out using column agglutination techniques. This case study examines an unusual instance of reagent interference in pretransfusion testing using column agglutination at the Hospital of Southern Denmark, Aabenraa.

Case Presentation: A 72-year-old male patient presented for pretransfusion testing prior to hernia surgery.

Impact of systematic variations in hematocrit and platelet count on thrombelastometry tissue factor activated assay parameters.

Background: Thromboelastogram testing is increasingly being used to manage patients with massive bleeding. An earlier study found that the test results were influenced by the hematocrit (Hct) and platelet (PLT) concentrations. This study sought to determine if these factors confounded the results of a different manufacturer's thromboelastography testing.

SARS-CoV-2 antibody kinetics in blood donors with a previously positive SARS-CoV-2 antibody test within a seroprevalence survey.

The persistence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibodies is a matter of importance regarding the coronavirus disease 19 (COVID-19) pandemic. To observe antibody dynamics, 105 blood donors, positive for SARS-CoV-2 antibodies by a lateral flow test within a seroprevalence study, were included in this study. Thirty-nine (37%) of 105 the donors were confirmed positive by a total Ig Wantai enzyme-linked immunosorbent assay (ELISA).

Quantification of anti-A of IgM or IgG isotype using three different methodologies.

Background: Reliability of ABO-antibody measurement is important in the context of supplying low-titer ABO incompatible plasma-containing blood products. This study investigated the correlation of anti-A measurements between three different titer methodologies.

Methods: Thirty-four blood group O individuals were included.

Time-related variation in IgG subclass concentrations in a group of healthy Danish adults.

Introduction: Immunoglobulin G subclass measurements are important for the diagnostic work-up of immunodeficiencies and immunoglobulin G4 (IgG4) related diseases. It is currently unknown whether a single sampling is truly representative for an individual's IgG subclass concentrations. This study aimed to investigate whether IgG and IgG subclass concentrations in healthy individuals are stable over time.

Comparison of six commercially available SARS-CoV-2 antibody assays-Choice of assay depends on intended use.

Objectives: Evaluate six commercial serological assays for detection of IgA, IgM or IgG SARS-CoV-2 antibodies in different disease severities.

Methods: Three lateral flow tests (LFTs) (Acro IgM/IgG, CTK IgM/IgG, Livzon IgM/IgG) and three ELISA assays (Euroimmun IgA and IgG, Wantai IgM) were included. Application was evaluated using samples from 57 patients with a positive SARS-CoV-2 reverse transcription polymerase chain reaction, stratified according to disease severity.

ABO blood group is related to bleeding in cardiac surgery.

Background: Increased bleeding and blood product transfusions during cardiac surgery are associated with poor outcomes. The patient's ABO blood group is related to hemostatic balance, although it is unclear whether this influences bleeding during cardiac surgery. This study aimed to evaluate whether ABO blood group is related to bleeding during cardiac surgery.

A novel ABO allele with a 21-bp duplication identified in two unrelated European individuals with weak A expression.

Objectives: To carry out genetic and serological analyses of a Swiss blood donor and a Danish patient carrying an aberrant ABO phenotype with weak A expression.

Background: ABO is the most clinically important blood group system but also one of the most complex. The system antigens are determined by carbohydrate structures generated by A and B glycosyltransferases encoded by the ABO gene.

Impact of RHD genotyping on transfusion practice in Denmark and the United States and identification of novel RHD alleles.

Background: Reduced D antigen on red blood cells (RBCs) may be due to "partial" D phenotypes associated with loss of epitope(s) and risk for alloimmunization or "weak" D phenotypes that do not lack major epitopes with absence of clinical complications. Genotyping of samples with weak and discrepant D typing is recommended to guide transfusion and RhIG prophylaxis. The goal was to compare the impact of RHD genotyping on transfusion practice in two centers serving different populations.

Urine neutrophil gelatinase-associated lipocalin and urine output as predictors of the successful discontinuation of continuous renal replacement therapy in critically ill patients with acute kidney injury.

Background: Continuous renal replacement therapy (CCRT) is a frequently used modality for the support of intensive care patients with acute kidney injury (AKI). Nevertheless, there are no objective criteria for the discontinuation of CRRT. The purpose of this study was to investigate whether urine neutrophil gelatinase-associated lipocalin (uNGAL) alone or in combination with urine output could be used as a diagnostic test for renal function recovery in ICU patients on CRRT.

Performance characteristics of thromboelastometry assays using incompletely filled and prolonged stored samples.

Background: Thromboelastometry (TEM) is often used to guide transfusion therapy in patients with massive bleeding. The effect of testing incompletely filled samples and those stored for a prolonged time at 4°C was investigated.

Methods: Whole blood samples were collected from 15 healthy blood donors and were pooled according to ABO group.

The quest for ingested peanut protein in human serum.

Background: There is mounting evidence that systemic uptake of food allergens is key to triggering anaphylaxis. However, direct proof for this theory is still lacking. The purpose of this study was to quantify the absorption and to determine the absorption kinetics of immunoreactive peanut protein in relation to the allergic response in human.

[Complete tachyphylaxis for vasopressin in a patient with subarachnoid haemorrhage].

In this case report, we present a 28-year-old woman who was admitted to a neuro-intensive care unit with sub-arachnoid haemorrhage. She was intubated and haemodynamically unstable. Over five days the need for norepinephrine reached the level of 1.

Results of noninvasive prenatal RHD testing in Gestation Week 25 are not affected by maternal body mass index.

Background: Reliability of noninvasive prenatal RHD genotype test (NIP RHD) depends on having sufficient amounts of cell-free fetal DNA (cffDNA) in the maternal plasma sample. The fraction of cffDNA in maternal plasma is inversely related to maternal body mass index (BMI), suggesting that high maternal BMI may limit the test's accuracy. This study determined the effect of maternal BMI on the accuracy of NIP RHD.

The effects of storage on platelet function in different blood products.

Objectives: Reduced platelet (PLT) function during storage has been shown for buffy-coat-derived platelet concentrates (BCP) and apheresis platelet units (AP), while for whole blood (WB) it has not been well studied. The aim of this study was to investigate PLT function in these blood products throughout storage using a novel flow cytometric assay.

Methods: Flow cytometric measurement of agonist-induced platelet aggregation, CD62P expression and PAC-1 binding during storage in BCP, AP (1-9 days at 20°C) and WB (1-21 days at 2-6°C).

Increased but stable isoagglutinin titers in hemodialysis patients.

Background: Prior to an ABO incompatible kidney transplantation it is important to know the recipient's pre-transplantation anti-A and/or anti-B (isoagglutinin) titer. This study determined if pre-transplantation isoagglutinin titers remained stable, over a period of 1 year, among hemodialysis patients.

Method: Blood was collected four times, every 3 months from 54 hemodialysis patients (hemodialysed trice per week ≥ 6 months), and 56 healthy volunteers.

Using Blood Donor-Derived ABO and RhD Blood Groups Helps to Detect Wrong Blood in Tube Errors in Recipients.

Background: Comparing the ABO and RhD group of a recipient's current pre-transfusion sample against their historical group is an important means of detecting wrong blood in tube (WBIT) errors. This study investigated the utility of using the donor ABO and RhD group as the historical check for recipients.

Methods: A single database stores serological information on blood donors, pregnant women, and patients throughout southern Denmark.

Reduced platelet activation and platelet aggregation in patients with alcoholic liver cirrhosis.

Results from previous studies regarding platelet function in liver cirrhosis are discordant. The aim was to investigate platelet activation and platelet aggregation in patients with alcoholic liver cirrhosis. We included 27 patients with alcoholic liver cirrhosis and 22 healthy individuals.

An international investigation into O red blood cell unit administration in hospitals: the GRoup O Utilization Patterns (GROUP) study.

Background: Transfusion of group O blood to non-O recipients, or transfusion of D- blood to D+ recipients, can result in shortages of group O or D- blood, respectively. This study investigated RBC utilization patterns at hospitals around the world and explored the context and policies that guide ABO blood group and D type selection practices.

Study Design And Methods: This was a retrospective study on transfusion data from the 2013 calendar year.

Minimal variation in anti-A and -B titers among healthy volunteers over time: Implications for the use of out-of-group blood components.

Background: Using potentially out-of-group blood components, like low titer A plasma and O whole blood, in the resuscitation of trauma patients is becoming increasingly popular. However, very little is known whether the donors' anti-A and/or anti-B titers change over time and whether repeated titer measurements on the same donor are required to ensure that each donation produces a low titer product.

Methods: The anti-A and/or anti-B titers were measured on 56 healthy adult volunteers (47 blood donors; nine blood center personnel) every 3 months for 12 consecutive months using an automated solid phase analyzer.

The Crossmatch/Issue Ratio: Use of a Novel Quality Indicator and Results of an International Survey on RBC Crossmatching and Issuing Practices.

Objectives: To understand the worldwide scope of RBC crossmatching and issuing practices and measure efficiency using a novel quality indicator, the crossmatch/issue (C/I) ratio.

Methods: An electronic survey was disseminated to hospital transfusion services collecting details about RBC crossmatching and issuing practices. Respondents were asked to enumerate the number of RBCs crossmatched and issued at their institutions during the 2014 calendar year to calculate the C/I ratio.