Correct!
5. All of the above

Her rheumatoid factor was positive at 45 IU/mL (normal <15). Her pulmonary function tests are below:

• FVC    94% predicted
• FEV1   80% predicted
• FEV1/FVC  65%
• TLC  113% predicted
• Dlco   75% predicted
• No significant change in FEV1 or FVC after bronchodilator

Her chest X-ray is shown in Figure 1.

Figure 1. Chest radiography.

Which of the following are true? (Click on the correct answer to proceed to the third of five pages)

1. Her chest x-ray shows increased interstitial markings
2. Her positive rheumatoid factor is diagnostic of rheumatoid arthritis
3. The pulmonary function tests are normal
4. 1 and 3
5. None of the above

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