Question:
In chronic obstructive pulmonary disease (COPD), which of the following spirometry findings is true?
In chronic obstructive pulmonary disease (COPD), which of the following spirometry findings is true?
Show Hint
The defining spirometry criterion for COPD is a post-bronchodilator FEV1/FVC below 0.7.
Updated On: Jun 24, 2026
- FEV1/FVC less than 0.7
- Normal FEV1/FVC ratio
- Reduced residual volume
- Increased FEV1
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: COPD is an obstructive airway disease, so airflow out of the lungs is limited. Spirometry captures this as a fall in the forced expiratory volume in 1 second (FEV1) relative to the forced vital capacity (FVC).
Step 2: The diagnostic hallmark is a post-bronchodilator FEV1/FVC ratio that is less than 0.7. This fixed reduced ratio confirms airflow obstruction that is not fully reversible.
Step 3: In COPD the residual volume actually rises due to air trapping and hyperinflation, so a reduced residual volume is wrong. FEV1 is reduced, not increased. A normal ratio would exclude obstruction.
Step 4: The diffusion capacity for carbon monoxide is typically low in emphysema, supporting the obstructive picture but the defining spirometric criterion remains FEV1/FVC less than 0.7.
Step 2: The diagnostic hallmark is a post-bronchodilator FEV1/FVC ratio that is less than 0.7. This fixed reduced ratio confirms airflow obstruction that is not fully reversible.
Step 3: In COPD the residual volume actually rises due to air trapping and hyperinflation, so a reduced residual volume is wrong. FEV1 is reduced, not increased. A normal ratio would exclude obstruction.
Step 4: The diffusion capacity for carbon monoxide is typically low in emphysema, supporting the obstructive picture but the defining spirometric criterion remains FEV1/FVC less than 0.7.
Was this answer helpful?
0
0
Top NEET PG Medicine Questions
- Identify the condition associated with the murmur in the image below
- A young man came to the medical OPD with complaints of early morning backache and stiffness, which improves on exercise, and persistent red eyes. On examination, lung expansion was less than 3 cm. X-ray is shown in the image given below.
What is the most probable diagnosis? - A patient with hyperkalemia and elevated urea levels underwent dialysis. Towards the end of the session, she became drowsy and had a sudden seizure episode. On examination, thepatient was hypotensive. What is the treatment for this condition?
- A female patient presents to the emergency department with severe restlessness, palpitations, and tremors. She is a known case of bronchial asthma. On examination, the neck looksswollen. Blood pressure is elevated, and tachycardia is noted. ECG shows atrial fibrillation.Which of the following drugs is used for immediate management in this patient?
- A 30-year-old male is found to be positive for HBsAg and HBeAg and is diagnosed with chronic hepatitis B. The patient’s viral load was 2x 100000 and SGPT is found to be doubled. What is the appropriate management in this patient? SGPT-Serum glutamate pyruvate transaminase
View More Questions
Top NEET PG Questions
- A patient hailing from Delhi presents with fever, arthralgia, and extensive petechial rash for 3 days. Lab investigations revealed a hemoglobin of 9 g/ dL, a white blood cell count of 9000 cells/mm3, a platelet count of 20000 cells/mm3, and a prolonged bleeding time. The clotting time was normal. What is the most likely diagnosis?
- Which of the following statements is true about Trichomonas vaginalis?
- A lady from West Rajasthan presented with an ulcer surrounded by erythema on the right leg. Microscopy of the biopsy from the edge of the ulcer showed organisms with dark staining nuclei and kinetoplast. What is the most likely causative agent?
- A child presents with a fever and a rash. Urine examination showed cells with owl's eye appearance. What is the most likely diagnosis?
- Infection with Clonorchis sinensis is associated with an increased risk of__?
View More Questions