Stress Test - V5 -4.95 mm

I am a 59 yr old male, no symptoms of heart disease.  History of Hypertension taking Lisinopril-HCTZ 20/25MG tablets. The electrocardiogram monitoring/graph showed text book until I was on the treadmill.  I took an Exercise Stress Test as part of an annual physical.  The doctor indicated the results as abnormal with anterior ST segment depression.  The work up was as follows:  HR/RPP/METS:  HR at rest: 55/min, Max. HR: 160/min (99% of Target HR: 161/min).  Max. RPP: 362, Max. METS: 9:30. BP at rest 142/93 mmHg, Max. BP: 189/109 mmHG, Arrhythmias: QRS: 1627, A: 132 PSV: 3 Significant ST Change: V5: -4:95 mm

The test was 7:31 min and recovery time was 5:02 min.  During the test there was no shortness of breath, no chest pain or pressure.  

During the pre-test in supine 2:10 min, METS 1.0 HR 79/min V5 -0.05
                           Standing  1:20        METS 1.0 HR 81  142/93 RPP 115 V5 0.00

Exercise Stage 1  3:00 min 1.7 mph 10% grade METS 4.6 HR 106  174/107  RPP 184  V5 -0.25
              Stage 2  3:00 min 2.5 mph 12% grade METS 7.0 HR 141  189/109  RPP 266  V5 -2.00
Peak Exercise      1:31 min 3.4 mph 14% grade METS 9.3 HR 159                               V5 -3.20
Recovery              5:02 min                              METS 1.0 HR 103   178/102 RPP 182   V5 -1.70

The doctor indicated that this may be a false positive or could be the early signs of something more significant. I do have an appointment with my doctor but I'm wondering, since I have heard that the jury seems to be out on how accurate this type of test.  Would this indicate the need for more comprehensive testing.  I had no side effects during, after or since the test.

John