scholarly journals Paper-based analytical devices for point-of-care blood tests

2021 ◽  
Vol 15 (4) ◽  
pp. 041303
Author(s):  
Hao Yuan ◽  
Ping-Yeh Chiu ◽  
Chien-Fu Chen
Keyword(s):  
Point Of Care ◽  
Blood Tests

Point-of-care blood tests with microfluidics

Physics Today ◽  
2015 ◽  
Vol 68 (11) ◽  
pp. 19-19
Author(s):  
Richard J. Fitzgerald
Keyword(s):  
Point Of Care ◽  
Blood Tests

scholarly journals Capillary blood tests may overestimate ketosis: triangulation between three different measures of β-hydroxybutyrate

2020 ◽  
Vol 318 (2) ◽  
pp. E184-E188 ◽  
Author(s):  
Jakob Norgren ◽  
Shireen Sindi ◽  
Anna Sandebring-Matton ◽  
Ingemar Kåreholt ◽  
Ulrika Akenine ◽  
...  
Keyword(s):  
Regression Models ◽  
Ketone Body ◽  
Point Of Care ◽  
Venous Blood ◽  
Capillary Blood ◽  
Dietary Interventions ◽  
Healthy Older Adults ◽  
Time Points ◽  
Blood Tests ◽  
Good Agreement

The ketone body β-hydroxybutyrate (BHB), assessed by a point-of-care meter in venous whole blood (BHBv), was used as the main outcome in a study on nutritional ketosis in healthy older adults. Two other BHB measures were also used in the study for validation and exploratory purposes, and here we report findings on correlation and agreement between those three methods. Ketosis in the range of 0–1.5 mmol/L was induced in 15 healthy volunteers by intake of medium-chain fatty acids after a 12-h fast. BHBv was assessed at 12 time points for 4 h. The same point-of-care meter was also used to test capillary blood (BHBc) at three time points, and a laboratory test determined total ketones (TK) in plasma (BHBp + acetoacetate) at four time points. A total of 180 cases included simultaneous data on BHBv, BHBc, BHBp, and TK. TK correlated with BHBp (Pearson’s r = 0.99), BHBv ( r = 0.91), and BHBc ( r = 0.91), all P < 0.0001. BHBv and BHBp had good agreement in absolute values. However, the slope between BHBc and BHBv, measured with the same device, was in the range of 0.64–0.78 in different regression models, indicating substantially higher BHB concentrations in capillary versus venous blood. We conclude that all three methods are valid to detect relative changes in ketosis, but our results highlight the importance of method considerations and the possible need to adjust cutoffs, e.g., in the management of ketoacidosis and in the evaluation and comparison of dietary interventions.

scholarly journals Performance evaluation of the point-of-care SAMBA I and II HIV-1 Qual whole blood tests

2016 ◽  
Vol 237 ◽  
pp. 143-149 ◽  
Author(s):  
Allyson V. Ritchie ◽  
Neha Goel ◽  
Hiroshi Sembongi ◽  
Jesse Lehga ◽  
Laura E. Farleigh ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Whole Blood ◽  
Point Of Care ◽  
Blood Tests ◽  
Hiv 1

scholarly journals Point-of-care blood tests during home visits by out-of-hours primary care clinicians; a mixed methods evaluation of a service improvement

BMJ Open ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. e033428
Author(s):  
Gail Hayward ◽  
Sharon Dixon ◽  
Sophie Garland ◽  
Margaret Glogowska ◽  
Helen Hunt ◽  
...  
Keyword(s):  
Primary Care ◽  
Mixed Methods ◽  
Point Of Care ◽  
Home Visits ◽  
Total Carbon ◽  
Secondary Outcome ◽  
Service Improvement ◽  
Team Approach ◽  
Out Of Hours ◽  
Blood Tests

ObjectivesWe aimed to evaluate test usage and patient and clinician experience following the introduction of point-of-care (POC) blood tests into a primary care out-of-hours service.DesignA mixed methods service evaluation comprising quantitative records of the clinical contexts of tests taken and qualitative interviews with clinicians. Research permissions and governance were obtained for patient interviews.SettingOut-of-hours primary care.ParticipantsAll patients requiring home visits from the service during the implementation period.InterventionsThe i-STAT POC blood test platform was introduced to two bases providing home visits for a period of 8 months. Venous blood samples were used and two cartridges were available. The CHEM8 cartridge measures sodium, potassium, chloride, total carbon dioxide (TCO2), anion gap, ionised calcium, glucose, urea, creatinine, haematocrit and haemoglobin. The CG4 cartridge measures lactate, pH, PaO2 and PCO2, TCO2, bicarbonate, base excess and oxygen saturation.Primary and secondary outcome measuresThe proportion of home visits where tests were taken, the clinical contexts of those tests, the extent to which clinicians felt the tests had influenced their decisions, time taken to perform the test and problems encountered. Clinician and patient experiences of using POC tests.Resultsi-STAT POC tests were infrequently used, with successful tests taken at just 47 contacts over 8 months of implementation. The patients interviewed felt that testing had been beneficial for their care. Clinician interviews suggested barriers to POC tests, including practical challenges, concerns about time, doubt over whether they would improve clinical decision making and concern about increased medicolegal risk. Suggestions for improving adoption included sharing learning, adopting a whole team approach and developing protocols for usage.ConclusionsPOC tests were not successfully adopted by an out-of-hours home visiting service in Oxfordshire. While some clinicians felt they could not add value, in other cases they resulted in improved patient experience. Adoption could be promoted by improving technical, team and education factors.

scholarly journals Comparison of Rapid Point-of-Care Tests for Detection of Antibodies to Hepatitis C Virus

2015 ◽  
Vol 2 (3) ◽  
Author(s):  
Dennis G. Fisher ◽  
Kristen L. Hess ◽  
Erlyana Erlyana ◽  
Grace L. Reynolds ◽  
Catherine A. Cummins ◽  
...  
Keyword(s):  
Hepatitis C Virus ◽  
Hepatitis C ◽  
Hepatitis B ◽  
Whole Blood ◽  
Point Of Care ◽  
Antibody Test ◽  
The United States ◽  
Blood Tests ◽  
Hcv Antibody ◽  
Point Of Care Tests

Abstract Background.  Hepatitis C is one of the most prevalent blood-borne diseases in the United States. Despite the benefits of early screening, among 3.2 million Americans who are infected with hepatitis C virus (HCV), 50%–70% are unaware of their infection status. Methods.  Data were collected between 2011 and 2014, from 1048 clients who were in the following groups: (1) injection drug users, (2) women at sexual risk, (3) gay and bisexual men, and (4) transgender individuals. The sensitivity and specificity of point-of-care tests included (1) the MedMira rapid human immunodeficiency virus (HIV)/HCV antibody test, (2) MedMira hepatitis B (HBV)/HIV/HCV antibody test, (3) Chembio HCV Screen Assay used with both whole blood and (4) oral specimens, (5) Chembio HIV-HCV Assay also used with both whole blood and (6) oral specimens, (7) Chembio HIV-HCV-Syphilis Assay, and (8) OraSure HCV Rapid Antibody Test used with whole blood. The gold standard for the HCV tests were HCV enzyme immunoassay (EIA) 2.0. Results.  OraSure had the highest sensitivity at 92.7% (95% confidence interval [CI] = 88.8%–96.5%) followed closely by Chembio's 3 blood tests at 92.1% (95% CI = 87.7%–96.4%), 91.5% (95% CI = 87.2%–95.7%), and 92.3% (95% CI = 88.4%–96.2%). The sensitivities of MedMira HIV/HCV and MedMira HIV/HCV/HBV tests were the lowest, at 79.1% (95% CI = 72.6%–85.5%), and 81.5% (95% CI = 75.2%–87.8%), respectively. Specificity for the OraSure was 99.8% (95% CI = 99.4%–100%); specificity for the Chembio blood tests was 99.2% (95% CI = 98.6%–99.9%), 99.4% (95% CI = 98.8%–99.9%), and 99.3% (95% CI = 98.8%–99.9%); and specificity for the MedMira was100% and 100%. False-negative results were associated with HIV and hepatitis B core antibody serostatus. Conclusions.  The OraSure and Chembio blood tests (including those multiplexed with HIV and syphilis) appear to good performance characteristics. This study has identified potential limitations of rapid testing in those testing positive for HIV and HBcAb. There should be discussion of updates to the 2013 CDC guidance.

scholarly journals Smartphone-Based Point-of-Care Cholesterol Blood Test Performance Evaluation Compared with a Clinical Diagnostic Laboratory Method

2019 ◽  
Author(s):  
Kyongsik Yun ◽  
Jaekyu Choi ◽  
In-Uk Song ◽  
Yong An Chung
Keyword(s):  
Test Performance ◽  
Blood Test ◽  
Laboratory Tests ◽  
Point Of Care ◽  
Blood Cholesterol ◽  
Clinical Diagnostic Laboratory ◽  
Diagnostic Laboratory ◽  
Blood Tests ◽  
Cholesterol Levels ◽  
Clinical Diagnostic

Managing blood cholesterol levels is important for the treatment and prevention of diabetes, cardiovascular disease, and obesity. An easy-to-use, portable cholesterol blood test will accelerate more frequent testing by patients and at-risk populations. We aim to evaluate the performance of smartphone-based point-of-care cholesterol blood tests as compared to that of hospital-grade laboratory tests. We used smartphone systems that are already familiar to many people. Because smartphone systems can be carried around everywhere, blood can be measured easily and frequently. We compared the results of cholesterol tests with those of existing clinical diagnostic laboratory methods. We found that smartphone-based point-of-care lipid blood tests are as accurate as hospital-grade laboratory tests (N=116, R&gt;0.97, P&lt;0.001 for all 3 cholesterol blood tests: total cholesterol, high density lipoprotein, and triglyceride). Our system will be useful for those who need to manage blood cholesterol levels to motivate them to track and control their behavior.

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