Patient Information

Noninvasive Vascular Laboratory

The Noninvasive Vascular Laboratory is one of the key components of the University of Maryland Medical Center, Center for Vascular Diagnostics. Noninvasive testing, as the name implies, allows patients to be examined using Doppler ultrasound and other techniques free of the risks and discomforts of injections and/or other invasive maneuvers. These tests allow diagnosis of almost all known or suspected vascular disorders and testing can often determine the severity of the problems and then its need for treatment. A full range of noninvasive tests are available at our Noninvasive Vascular Laboratory including tests for:

Peripheral Arterial Disease (PAD) - blockages in the circulation to the arms or legs due to atherosclerosis or other diseases, which may threaten the limbs.

  • Doppler arterial exams of the legs or arms (Physiologic testing)
  • Duplex ultrasound scan of the extremity arteries
  • Treadmill exercise testing for claudication (leg pain with walking)

Cerebrovascular Disease - blockages in the arteries to the brain or holes in the heart that may increase the risk of stroke

  • Carotid artery duplex scan
  • Transcranial Doppler bubble study

Intracranial Vascular Disease - blockages or spasm of arteries inside the brain

  • Transcranial Doppler (TCD)

Deep Venous Thrombosis (DVT) - blood clots in the veins that could migrate to the lungs

  • Inferior vena cava (IVC) scan

Renal Artery Disease - circulatory disorders of the kidneys that cause

Renal artery duplex scan hypertension (high blood pressure) or kidney failure

  • Duplex scan of the renal veins

Mesenteric Arterial Disease - disorders of circulation to the gut

Aortic Aneurysms - a ballooning of the major artery that can cause fatal rupture

  • Aortic duplex scan

  • Duplex scan of peripheral arteries for aneurysms

Chronic Venous Disease
- varicose veins and other disorders that cause leg swelling and leg ulcers

  • Photoplethysmography (PPG)
  • Air plethysmography (APG)
  • Duplex scan of the venous valves

Dialysis Access planning and follow-up - testing of veins and arteries in the arms to plan the procedure, and to follow-up on how the access is maturing and doing over the long-term. 

  • Mapping of the arm arteries and veins prior to dialysis fistula creation
  • Dialysis access maturation study

Other specialized examinations

  • Contrast-enhanced ultrasonography for aortic endografts
  • Vein "mapping" for peripheral vascular or coronary bypass
  • Arm artery "mapping" for coronary bypass
  • Temporal artery duplex scan for Temporal arteritis
  • Ocular duplex scan for ocular ischmia

The Noninvasive Vascular Laboratory is a modern, uniquely designed facility to serve both inpatients and outpatients and is conveniently located in the main University Hospital. The vascular laboratory is accredited by the Intersocietal Commission for the Accreditation of Vascular Laboratories (ICAVL).

Research and Quality Improvement

Noninvasive vascular testing is most often used to diagnose vascular disorders and assess their severity. However, many of these tests can also be used to measure the effect and success of treatments. Testing after vascular surgery procedures can determine if the vessel has been restored to normal or measure the magnitude of improvement in the flow. As time passes, these tests can also be used to document thedurability of a treatment or compare one treatment two another (e.g. angioplasty vs. bypass). In these ways, the noninvasive vascular laboratory also contributes to the clinical research mission of the Division of Vascular Surgery, and to its commitment to quality improvement in patient care through outcome assessments.

Venous Screening Program

The purpose of the Venous Screening Program is to:

  • Promote awareness about venous diseases including deep venous thrombosis (DVT, blood clot in the leg), pulmonary embolism (PE), chronic venous insufficiency (CVI) and varicose veins (VV)
  • Promote venous health by identifying individuals at high risk for DVT
  • Improve venous health by identifying individuals with CVI and VV

Screening offers an opportunity to know if you are at risk for venous disease, so you can make a lifestyle change to reduce that risk. Screening will also inform you if you have venous disease so that you may be treated as soon as possible with appropriate therapy. 

The venous screening program is a combination of a questionnaire and a rapid ultrasound examination. It takes about 20 minutes and can provide important information to participants about their risk of venous disease. 

Venous screening is a free public service provided to all hospital and university employees at our Center for Vascular Diagnostics. 

The Noninvasive Vascular Laboratory is a modern, uniquely designed facility to serve both inpatients and outpatients and is conveniently located at: 

  • Outpatient Paca Redwood Lab
    419 West Redwood Street, Suite 300
    Baltimore, MD 21201
  • Inpatient Hospital Lab
    22 South Greene Street, Room SB03
    Baltimore, MD 21201

The vascular laboratoy is accredited by the Intersocietal Accreditation Commission (IAC)

Staff and Faculty

Brajesh K. Lal, M.D.
Director of Noninvasive Services, UMMS
Medical Director, Vascular Laboratory

Sue McEvoy, BS, RDMS, RVT
Technical Director

Peggy Kidwell, BS, RDMS, RVT
Lead Technologist

Average rating (0)