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Apr 13, 2022 · A laboratory-based test is more reliable than field testing, primarily due to its standardised protocol, equipment (accurate and calibrated) and consistent environmental conditions. WHY DO WE TEST? Testing is done to accurately and objectively determine training zones, assess training status and physiological profile, as well as to evaluate ...
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Learn the differences between lab testing and field testing, two methods of usability testing, and how to choose the best one for your project.
Mar 10, 2018 · Lab Tests. Some lab tests provide qualitative results and others quantitative. A procedure called a Western blot, for example, typically provides only qualitative data -- whether or not a particular protein was present, but not how much of it was present.
- Abstract
- The “Laboratory Testing Cycle”
- Diagnostic Decision Making
- Medical Necessity
- Questions to Ask Before Ordering A Laboratory Test
- Reasons For Ordering A Laboratory Test
- Approaches For Establishing A Diagnosis Based on Laboratory Test Results
- Clinical Performance Characteristics of Laboratory Tests
- Receiver-Operator Characteristic (ROC) Curves
- Reference Interval For Interpreting Laboratory Test Results
The purpose of this CE Update is to discuss the laboratory testing cycle and its importance in diagnostic decision making. This discussion will begin with some general comments about approaches to ordering clinical laboratory tests, followed by “real-world” examples to illustrate these approaches. We will then review the important diagnostic perfor...
The “laboratory testing cycle” (Figure 1) consists of all steps between the time when a clinician thinks about and orders a laboratory test and the time the appropriate patient’s sample for testing is obtained (eg, a blood specimen taken from an antecubital vein) and the results of the testing are returned to the clinician (often called the “vein-t...
The use of clinical laboratory test results in diagnostic decision making is an integral part of clinical medicine. The menu of laboratory tests available to clinicians constitutes an impressive array that has expanded exponentially since 1920 when Folin and Wu devised the first useful test for the quantification of serum glucose concentration.3The...
As private health maintenance organizations (HMOs) and government-sponsored agencies (eg, Department of Health and Human Services [DHHS] and the Centers for Medicare and Medicaid Services [CMS]) seek to provide quality medicine cost effectively, reduction in the ordering of “unnecessary” laboratory tests has become a favorite target of these effort...
An understanding of which laboratory tests are appropriate to order in the diagnosis and follow up of a patient’s medical condition should include prior consideration of the answers to the following questions:4 1. Why is the test being ordered? 2. What are the consequences of not ordering the test? 3. How good is the test in discriminating between ...
There are 4 major legitimate reasons for ordering a laboratory test:4 1. Diagnosis (to rule in or rule out a diagnosis). 2. Monitoring (eg, the effect of drug therapy). 3. Screening (eg, for congenital hypothyroidism via neonatal thyroxine testing). 4. Research (to understand the pathophysiology of a particular disease process).
The principal approaches for establishing a diagnosis based on laboratory test results include:4 1. Hypothesis deduction. 2. Pattern recognition. 3. Medical algorithms. 4. Rifle versus shotgun approach. Hypothesis deductioninvolves establishing a differential diagnosis based on the patient’s history, including family, social, and drug history, and ...
Because the clinical performance characteristics of all laboratory tests differ with respect to their diagnostic accuracy (ie, sensitivity and specificity), the selection of the appropriate laboratory test to order will vary depending on the purpose for which the test is to be used. Before considering this aspect of the selection of laboratory test...
Receiver- (or relative-) operator characteristic (ROC) curves provide another useful tool in assessing the diagnostic accuracy of a laboratory test, because all (specificity, sensitivity) pairs for a test are plotted. The principal advantage of ROC curves is their ability to provide information on test performance at all decision thresholds.3,6 Typ...
Once a clinical laboratory test with the appropriate diagnostic accuracy has been ordered, how are the results of the test interpreted? Typically, a reference interval or a decision level is used, against which the patient’s test value is compared. Decision levelrefers to a particular cutoff value for an analyte or test that enables individuals wit...
- Frank H. Wians
- 2009
Lab Tests Online-UK is written by practising laboratory doctors and scientists to help you understand the many clinical laboratory tests that are used in diagnosis, monitoring and treatment of disease.
Apr 21, 2008 · Laboratory testing is an exact science conducted by trained professionals, with rigorous statistical analysis, quality controls, and extensive oversight. Medical testing is an important component in the diagnostic tool kit.
Jan 30, 2019 · Point of care testing (POCT) is defined as diagnostic testing that is performed at or near to the site of the patient with the result leading to a potential change in the care of that patient. Essentially it is a laboratory test conducted outside of the laboratory setting, usually by appropriately trained non-laboratory staff.
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