Geometric Design

QuantaFlo PAD Testing

QuantaFlo® is our flagship solution that allows providers to test for early signs of Peripheral Arterial Disease (PAD) in clinical or home settings in a matter of minutes using any compatible device.

Complete PAD testing kit, including a laptop and tablet showing QuantaFlo logos, with a sensor resting on the laptop
Design Dots
Female doctor showing results of a PAD test at home to female patient

Peripheral Arterial Disease Testing at the Point of Care

QuantaFlo PAD gives providers the opportunity to improve patient outcomes and lower operating costs by providing fast, accurate test results for peripheral arterial disease directly at the point of care in less than 3 minutes.

QuantaFlo PAD runs on Windows, Android, and iOS for tablets and mobile, and can be integrated with enterprise-level data management systems (EMRs). Combined with the high portability of our solution, this means less time in front of a device, and more time spent caring for patients

How does QuantaFlo PAD work?

When blood flow is obstructed, turbulent fluctuations occur in blood volume in the extremities. QuantaFlo PAD uses an infrared sensor to measure these fluctuations in both early and later stages of PAD, including in patients with calcified vessels.

When paired with one of our sensors, our QuantaFlo PAD test analyzes patient arterial blood flow using volume plethysmography. Waveforms are presented visually for users as sensors are connected to patient digits.

On-screen instructions guide users easily through the PAD testing process, and analysis from the application will notify users of any adjustments required to achieve the optimal signal quality.

Results with actionable insights are available in under 3 minutes.

Male provider performing QuantaFlo PAD test on female patient
A laptop and tablet showing QuantaFlo PAD test results with a sensor resting against the laptop

QuantaFlo PAD Advantages

Highly portable and easy to use – only a sensor and a single mobile device are required to perform a QuantaFlo PAD test
Sensors are compatible with a wider range of patients, including those with non-compressible, calcified arteries
Detects earliest stages of atherosclerosis and all stages of PAD, providing insight into disease progression and severity
Results are supported by peer-reviewed research and publications

Contact us today to learn more about QuantaFlo PAD

How is QuantaFlo different from ABI?

ABI measurement uses a cuff-based system to measure arterial pressure in the arms and at two locations in the ankle. These pressure values are used to calculate the ABI ratio.

While ABI is able to sufficiently detect advanced PAD, it typically is unable to detect PAD at pre-clinical disease levels and in patients with calcified vessels.

Patient lying on exam table during an ankle-brachial index (ABI) test
Female provider sharing PAD test results with elderly male patient

Does a positive QuantaFlo PAD result require confirmation by ABI?

No! QuantaFlo PAD is a stand-alone test that supports clinicians in the early diagnosis of PAD and does NOT require confirmation by cuff-based ABI.

For patients presenting with symptoms and/or with severe disease, providers may opt to order a duplex ultrasound to identify specific location(s) and severity of any plaque lesions to determine a treatment plan.

Visualization of atherosclerosis, cross-section of artery showing fatty plaque buildup and blood flow obstruction

Have more questions about QuantaFlo PAD?

Additional Services

Design Dots


A robust, scalable EMR integration engine for healthcare data exchange that can be customized to the unique needs of your enterprise. SemlerConnect is compatible with nearly all healthcare data standards and protocols.


A secure web portal that allows customers view and/or download test reports posted stored on Semler’s servers.


A robust, three-tiered analytics package to empower your decision-making in clinical, operational, and financial settings. All tiers are available 30 days post go live.

Federated Login

Our technical team is able to integrate our SemlerShield cloud services with existing enterprise credentials to reduce the number of different logins users are required to enter before performing a QuantaFlo test.


Semler Scientific provides a simulation training as part of our accredited Certificate Training Program for all customers. We also offer live sessions with our experienced Semler Educators to further enhance learning.


Dr. Long is a retired vascular surgeon and serves as Semler Scientific’s in-house medical director.
His wealth of knowledge and experience have helped guide the development of our QuantaFlo solution into what it is today.

View Dr. Long Testimonial

Discover the hidden threats of PAD with QuantaFlo