Diffusing capacity (eg, carbon monoxide, membrane) (List separately in addition to code for primary procedure)
CPT4 code
Name of the Procedure:
Diffusing Capacity of the Lungs (Common name: DLCO Test, Carbon Monoxide Diffusing Capacity Test)
Summary
The DLCO test measures how well gases such as oxygen pass from the lungs into the blood. It involves inhaling a small amount of carbon monoxide to assess how efficiently the lungs transfer gas.
Purpose
The DLCO test is used to diagnose and monitor lung diseases. It helps evaluate the lungs' capacity to transfer oxygen into the bloodstream, which is essential for identifying conditions like pulmonary fibrosis, emphysema, and other respiratory disorders.
Indications
- Symptoms like shortness of breath, persistent cough, or fatigue.
- Abnormal findings on chest X-rays or CT scans.
- Monitoring lung conditions like chronic obstructive pulmonary disease (COPD) or pulmonary hypertension.
Preparation
- Patients may need to avoid smoking for at least 24 hours prior.
- Fasting is typically not required.
- Certain medications may need to be withheld; instructions will be provided by the healthcare provider.
- Baseline pulmonary function tests might be administered beforehand.
Procedure Description
- The patient sits and wears a nose clip to prevent air escape.
- They breathe in and out through a mouthpiece connected to a machine.
- After exhaling fully, the patient inhales a test gas mixture containing a small amount of carbon monoxide.
- The patient holds their breath for about 10 seconds before exhaling.
- The machine measures the gas concentrations to calculate lung diffusing capacity.
Tools: Pulmonary function testing machine equipped with gas analyzers.
Anesthesia: Not required.
Duration
The DLCO test typically takes about 15-30 minutes.
Setting
Usually performed in a pulmonary function lab within a hospital or an outpatient clinic.
Personnel
- Respiratory therapists or pulmonary function technologists conduct the test.
- A pulmonologist may oversee and interpret the results.
Risks and Complications
- Minimal risks, generally safe.
- Rarely, the test might provoke mild shortness of breath or dizziness.
- Proper management with medical assistance if any discomfort arises.
Benefits
- Provides valuable information on lung health and function.
- Helps in early detection and monitoring of lung diseases.
Recovery
- Generally, no recovery time needed.
- Resume normal activities immediately after the test.
- Follow-up appointments as scheduled to discuss results with a healthcare provider.
Alternatives
- Other diagnostic tests include spirometry, arterial blood gas analysis, and imaging studies like CT scans.
- Each alternative has different pros and cons in terms of detail, invasiveness, and specificity.
Patient Experience
- Mild discomfort from wearing the nose clip and holding the breath.
- Generally, the procedure is well-tolerated.
- Post-procedure, patients can typically resume their normal routine without any restrictions.