This study is designed to test two hypotheses:

1. The PADnet+ testing system produces clinically equivalent results as the Parks Flo-Lab testing system in a group of patients referred for evaluation of PAD of the limbs when performed by a Registered Vascular Technologist (RVT).
2. The PADnet+ testing system produces clinically equivalent results when the testing is repeated on the above patients and performed by staff specifically trained on the use of the PADnet+ system but are not vascular technologists nor hold the RVT certification.

Inclusion Criteria:

• All patients referred to the MGH Vascular Labs for diagnostic testing for PAD

Exclusion Criteria:

• None

All patients referred to the MGH Vascular Labs for diagnostic testing for PAD