A Multi-Center Trial of the ProLung Test™

Inclusion Criteria: Subjects who meet all of the following criteria may be enrolled in this Study: 1. Subject is male or female, age 18 or older. 2. Subject has undergone CT scan of the lung(s) that indicates one or more nodules or lesions suspicious for lung cancer. 3. Subject's pulmonary nodule or lesion is greater than 4mm. Size is determined by the largest nodule or lesion dimension identified from CT imaging. 4. Subject meets one or more of the following conditions: * indicated for a tissue biopsy * indicated for surgical resection of the lung 5. Subject must be able to receive a ProLung Test * within 60 days of abnormal CT (Inclusion Criterion 2 \& 3) * within 60 days prior to the tissue biopsy or surgical resection (Inclusion Criterion 4). 6. Subject is capable of understanding and agreeing to fulfill the requirements of this Protocol. 7. Subject has signed the IRB/IEC approved Informed Consent Form ("ICF"). Exclusion Criteria The following criteria will disqualify a subject from enrollment into this Study: 1. Subject has an implanted electronic device in the chest. 2. Subject receiving therapy for suspected chest infection such as fungal infection or tuberculosis. 3. Subject with diagnosed malignancy other than lung cancer, non-melanoma skin cancer or any cancer in which the Principal Investigator does not suspect metastatic disease to the lung, who has 2 or more suspicious pulmonary nodules. 4. Subject has received an invasive medical or surgical procedure within the thoracic cavity within 30 days prior to the ProLung Test or within the previous 14 days for a bronchoscopic procedure. 5. Subject presents with an anomalous physical or anatomical condition that precludes ProLung Test measurement. 6. Subject will have undergone unusually strenuous exercise within 24 hours. 7. Subject who has significant systemic diseases such as uncontrolled diabetes, advanced heart failure, or a recent myocardial infarction, or other medical condition such as severe morbid obesity that in the judgment of the Principal Investigator would make him/her unsuitable for the Study.