Cardiopulmonary Diagnostics

Course Description

Cardiopulmonary Diagnostics addresses a range of cardiopulmonary indicators and relates test results to potential patient health care outcomes.

Within the SCNS taxonomy, RET is the Respiratory Care prefix, and the 4000-level number places this in the upper division — the senior year of a bachelor's completion programme for credentialed therapists. Daytona State publishes it at 3 credits, offered summer and fall, giving approximately 45 contact hours consistent with the published RET3536 in this repository.

The framing in the description is the point: relating test results to outcomes, rather than simply performing tests. That is the difference between the associate-level and the baccalaureate-level competency — a therapist who can run a pulmonary function test is a technician; one who can interpret the pattern, understand its predictive value, and explain what it means for a patient's trajectory is practising at the level a bachelor's degree is meant to confer.

Learning Outcomes

Required Outcomes

• Describe the purposes of cardiopulmonary diagnostic testing and its role in clinical decision-making.
• Describe spirometry, its measurement, and the standards governing acceptable and repeatable manoeuvres.
• Interpret spirometry, distinguishing obstructive from restrictive patterns.
• Describe and interpret bronchodilator response testing.
• Describe lung volume measurement methods and interpret the results.
• Describe and interpret diffusing capacity testing.
• Describe bronchoprovocation testing and its indications.
• Apply reference equations and describe the interpretive consequences of the reference set used.
• Describe quality control and calibration requirements for pulmonary function equipment.
• Recognize technically unacceptable results and describe their causes.
• Describe arterial blood gas analysis, co-oximetry, and their quality assurance.
• Describe exercise testing, including six-minute walk and cardiopulmonary exercise testing.
• Describe electrocardiography and interpret rhythm and common abnormalities.
• Describe echocardiography and cardiac imaging at an introductory level.
• Describe haemodynamic monitoring and interpret derived values.
• Describe sleep diagnostics, including polysomnography and home sleep testing.
• Describe bronchoscopy and associated diagnostic sampling.
• Describe thoracic imaging modalities and their diagnostic roles.
• Relate diagnostic findings to disease processes and expected clinical outcomes.
• Evaluate the sensitivity, specificity, and predictive value of a diagnostic test.
• Communicate diagnostic findings appropriately within scope of practice.
• Apply regulatory and accreditation requirements applicable to diagnostic laboratories.

Optional Outcomes

• Describe metabolic and nutritional assessment testing.
• Describe paediatric and infant pulmonary function testing.
• Describe occupational lung disease screening and surveillance.
• Describe preoperative pulmonary risk assessment.
• Describe emerging diagnostic technologies.
• Prepare for a pulmonary function or sleep specialty credential.

Major Topics

Required Topics

• Purposes and role of diagnostic testing
• Spirometry and manoeuvre acceptability
• Obstructive versus restrictive interpretation
• Bronchodilator response
• Lung volume measurement
• Diffusing capacity
• Bronchoprovocation
• Reference equations and their effects
• Quality control and calibration
• Recognizing unacceptable results
• Blood gas analysis and quality assurance
• Exercise testing
• Electrocardiography
• Echocardiography and cardiac imaging
• Haemodynamic monitoring
• Sleep diagnostics
• Bronchoscopy and diagnostic sampling
• Thoracic imaging
• Relating findings to disease and outcomes
• Test performance: sensitivity, specificity, predictive value
• Communicating findings within scope
• Regulation and laboratory accreditation

Optional Topics

• Metabolic and nutritional testing
• Paediatric and infant testing
• Occupational screening and surveillance
• Preoperative risk assessment
• Emerging technologies
• Specialty credential preparation

Resources & Tools

• Ruppel's Manual of Pulmonary Function Testing — the definitive reference for the pulmonary function content.
• Egan's Fundamentals of Respiratory Care and Clinical Assessment in Respiratory Care (Wilkins) for the broader diagnostic material.
• ATS/ERS technical standards — the free official standards for spirometry, lung volumes, and diffusing capacity. These are the operative authority on acceptability and repeatability criteria, and they are periodically revised.
• AARC Clinical Practice Guidelines (aarc.org) — free, and several cover diagnostic procedures directly.
• NBRC (nbrc.org) — free content outlines, including the pulmonary function technologist credentials (CPFT and RPFT) and the sleep disorders credential.
• Global Lung Function Initiative (GLI) — free reference equations and calculators; see the flag below on why the reference set matters.
• Life in the Fast Lane ECG library — free and comprehensive for the electrocardiography component.
• Radiopaedia — free, and excellent for thoracic imaging.
• CMS CLIA resources — free, and the regulatory framework for laboratory testing quality.
• PubMed and library databases — free through enrollment; upper-division work should engage primary literature.

Career Pathways

• Pulmonary function technologist — with the CPFT or RPFT credential; a well-defined and better-paid specialization.
• Sleep disorders specialist — with the NBRC sleep credential or RPSGT; a growing field.
• Diagnostic laboratory supervisor or manager — the baccalaureate is frequently the entry requirement.
• Cardiopulmonary department leadership — supervisor, manager, and director roles.
• Clinical educator — hospital-based education and programme faculty; the B.S. is typically required.
• Research coordinator — clinical trials in respiratory disease.
• Industry clinical specialist — diagnostic equipment manufacturers.
• Quality and accreditation roles — laboratory compliance and ACR or Joint Commission preparation.
• Graduate study — the B.S. opens master's programmes in health administration, education, and advanced practice.
• SOC codes 29-1126 Respiratory Therapists and 29-2099 Health Technologists and Technicians; supervisory roles under 11-9111 Medical and Health Services Managers.

Special Information

⚠ A test result is only as good as the manoeuvre — quality control is the substance

The professional core of diagnostic testing, and the reason technologist competence matters so much.

Pulmonary function testing is effort-dependent, which makes it unlike most laboratory tests. A patient who does not perform the manoeuvre correctly produces a number that looks like a result and is not one — and a physician who acts on it makes a wrong decision.

• Acceptability and repeatability criteria are defined in the ATS/ERS technical standards, and they are the operative authority. A test that does not meet them should be reported with that limitation stated, not silently.
• Coaching is a clinical skill. Getting a maximal effort out of a patient who is unwell, elderly, or anxious requires energetic, specific instruction — and the technologist's coaching quality measurably affects results.
• Common technical failures — submaximal effort, early termination, glottic closure, leaks around the mouthpiece, cough during the manoeuvre, and hesitation at the start — each have a recognizable signature on the flow-volume loop.
• Look at the curves, not just the numbers. The flow-volume loop shows what happened; the tabulated values do not.
• Calibration and biological controls are daily requirements, and documented quality control is both good practice and a regulatory expectation.
• Report honestly. A technologist who marks a poor-quality test as acceptable to avoid repeating it has produced clinical misinformation, and this is a real integrity pressure when schedules are full.

⚠ Reference equations changed — and race-based adjustment is being abandoned

A significant and current development that an upper-division diagnostics course must address, because it changes interpretation directly.

Pulmonary function results are reported against predicted values derived from reference populations, and for decades those equations incorporated race-based correction factors — applying different predicted values to Black and Asian patients.

• That practice has been substantially reconsidered. The rationale was never a demonstrated biological difference attributable to race, and the correction had the effect of normalizing lower measured lung function in Black patients — with consequences for diagnosis, disability determination, occupational compensation, and transplant eligibility.
• Race-neutral reference equations — the Global Lung Function Initiative global equations among them — have been developed and are being adopted, and major professional bodies have moved toward recommending race-neutral interpretation.
• The practical consequence is real. Switching reference sets changes percent-predicted values and can change whether a patient is classified as abnormal, which affects clinical and administrative decisions.
• Know which equation your laboratory uses, and be able to explain what changed and why when a physician asks about a shifted value.
• This is a live example of a broader principle: measurement standards embed assumptions, and a diagnostics professional should be able to interrogate them rather than accepting the printout.

Rule 11 applies with force — this area is actively changing through professional society statements and laboratory practice. Verify current ATS/ERS guidance and your laboratory's standard rather than relying on a textbook or this guide.

⚠ Understand what a test result actually tells you — and what it does not

The interpretive reasoning a baccalaureate-level course should develop, and it is where "relating test results to outcomes" lives.

• Sensitivity, specificity, and predictive value are different things, and predictive value depends on the prevalence of the condition in the population tested. A highly specific test applied to a low-prevalence population still produces mostly false positives.
• Pre-test probability matters. The same result means different things in a symptomatic smoker and an asymptomatic screening subject.
• Pulmonary function identifies patterns, not diagnoses. An obstructive pattern is consistent with several conditions; the diagnosis requires clinical context. Reporting a pattern is within scope; diagnosing is not.
• Statistical abnormality is not clinical abnormality. Values are defined against a distribution, and a proportion of healthy people fall outside the limits by definition.
• Serial results are frequently more informative than a single one. A decline over time can be meaningful even when every individual value is within normal limits.
• Consider what the test cannot see. Normal spirometry does not exclude significant disease, and early small airways disease in particular is poorly detected.

Scope note: a respiratory therapist performs testing, assesses quality, and reports results; formal interpretation and diagnosis are the physician's act. Discussing findings with the ordering physician is appropriate and expected; giving a patient a diagnosis is not.

⚠ The B.S. changes what you can do — plan the credential alongside it

Practical career guidance specific to a bachelor's completion programme.

• The associate degree qualifies you to practise; the bachelor's opens the roles above the bedside — supervision, management, education, quality, and research coordination — which increasingly require it.
• Specialty credentials pair naturally with this course. The CPFT and RPFT pulmonary function credentials and the NBRC sleep disorders credential are directly supported by this material, and holding one is a concrete differentiator.
• Florida institutions offer RRT-to-B.S. completion online and part time, designed for working therapists — Daytona State's programme is one of them.
• Employers frequently fund it. Tuition assistance for degree completion is common in hospital systems and is widely underclaimed.
• The degree is a prerequisite to graduate study in health administration, education, and advanced practice pathways.
• Note the level boundary. This is a 4000-level course; associate-level diagnostic coursework will not substitute for it, and lower-division credit cannot satisfy an upper-division requirement.

⚠ CoARC, NBRC, and Florida licensure — the pathway, in order

• Graduation from a CoARC-accredited programme is required for NBRC examination eligibility. Accreditation is a gate, not a quality signal — CoARC publishes status and outcomes data, and both are worth checking before enrolling anywhere.
• The NBRC pathway runs through the Therapist Multiple-Choice (TMC) examination. A lower cut score yields the CRT; a higher cut score plus the Clinical Simulation Examination yields the RRT.
• Aim for the RRT. Most Florida hospitals require or strongly prefer it, and the difference in employability and pay is substantial.
• Florida licenses respiratory care practitioners under Chapter 468, Part V, Florida Statutes, through the Department of Health. Licensure is a separate process from credentialing, with its own application, screening, and fees — begin it before you finish the programme.
• Specialty credentials — neonatal/paediatric, sleep disorders, pulmonary function, and adult critical care — extend a career and pay.

Rule 11 applies — NBRC examination structure and cut scores, CoARC standards, and Florida licensure requirements all change. Verify with each body directly.

How Florida course levels affect transfer

The first digit of an SCNS number denotes the year of offering, not transferability. Courses at the 1000 and 2000 levels transfer transparently between Florida public institutions, and 3000 to 4000 is unproblematic since both are upper division. The boundary that actually matters is 2000 to 3000, where lower-division credit generally cannot satisfy an upper-division requirement.

RET4445 is a lecture course, 3 credits and approximately 45 contact hours, offered summer and fall, and delivered in a format designed for working therapists. Expect interpretation-heavy assessment — reading spirometry tracings, blood gases, tracings and reports — alongside case analysis relating findings to outcomes, and engagement with primary literature appropriate to upper-division work.

RET4445 is upper division: an associate-level diagnostics course will not substitute. Students entering a bachelor's completion programme should note that A.S. degrees are applied and do not carry the A.A.'s junior-status guarantee, though these completion programmes are built specifically for credentialed A.S. graduates and publish their articulation explicitly.