Presentation on theme: "The Diagnostic Testing Process"— Presentation transcript:
1 The Diagnostic Testing Process Module 2The Diagnostic Testing Process
2 Photo by Elizabeth Wantuch,MD Case Scenario 1In order to make their daily work-flow smoother, a resident and intern on a busy inpatient service include the following order when they admit any patient:Draw daily CBC, CMP, PT, PTT, Magnesium, Ionized Calcium and Phosphorous x 30 daysComment on this approach to their care of patients.
3 Case Scenario 1 Discussion 4 major roles for laboratory tests in patient care:Diagnosis of diseaseMonitoring of disease, therapies, interventionsScreening for diseaseResearch
4 Case Scenario 1 Discussion The resident and intern (though perhaps well-intentioned) are not properly utilizing laboratory testing and the clinical laboratoryThey are not ordering specific laboratory tests based on clinical questionsAND in doing so they areIncreasing the cost of healthcareContributing to the development of iatrogenic anemiaLeading to potentially unnecessary work-up if any errors in the diagnostic testing process occur
5 Laboratory testing begins and ends with patient care Clinician develops a clinical questionSpecific laboratory test is selectedTest is orderedSpecimen is collectedSample is prepared for analysisSample is analyzedResult is verifiedResult is reportedTest result is interpreted in context of clinical scenarioAction is takenPatient care is affectedImage by Theresa Kristopaitis, MD
6 Diagnostic Testing – 3 Phases The diagnostic testing process can be separatedinto three phases:Preanalytic phaseAnalytic phasePost analytic phaseVariables that may affect proper interpretation of test results are present in each phase.Test result changes due to clinical factors must be interpreted in consideration of these variables.
7 Clinician develops a clinical question Specific laboratory test is selectedTest is orderedSpecimen is collectedSample is prepared for analysisSample is analyzedResult is verifiedResult is reportedTest result is interpreted in context ofclinical scenario10. Action is taken11. Patient care is affectedPREANALYTICPhaseANALYTICPhasePOSTANALYTICPhase
8 Why is this important?When a physician orders a lab test and receives a test result, there are a multitude of factors (variables) that could (and usually should) be considered in interpreting the test result
9 In the upcoming modules, we will further explore: The Preanalytic testing phaseThe Analytic testing phaseThe Postanalytic testing phaseThe process of establishing Reference (normal) values
10 Proceed to “Module 3 - Preanalytic Phase of Laboratory Testing”