Medical Services
Our patients enjoy the convenience of on-site testing and services. A summary is provided below. Please note that some insurance plans contract for services outside our office. We will be happy to find out if we are authorized to provide these services under your plan.

Clinical Research
Thunderbird Internal Medicine Summit Medical Group Arizona is proud to offer clinical research studies to the public. We have teamed with Radiant Research, a 20+ year-old company that partners with leading medical practices, to evaluate new medical treatments in controlled scientific settings.

The studies offer the public a chance to participate in the development of new medical treatments. Participants may be able to access new research treatments before they are widely available to the public and help others by contributing to medical science. In addition, participants may also receive tests and study medication at no cost.

What are clinical trials?

Clinical trials are studies in strictly controlled scientific settings. Required by the Federal Drug Administration for new drugs and treatments, they are designed to:
    assess the safety and effectiveness of an experimental therapy; or
    compare the effectiveness of two standard or marketed treatments.

Should I participate?

Eligibility to participate in a trial depends on the tests being conducted. These requirements are based on:
    Type and stage of a disease
    Current and previous treatments
    Other medical conditions

The four phases of clinical research trials:

Phase I – testing of new drugs or treatments in a small group (20-80) of healthy people to evaluate the safety, dosage range and side effects.
Phase II – study drug or treatment is provided to a larger group (100-300) of people with the disease state under study to further evaluate its safety, dosage range and side effects
Phase III – study drug or treatment is provided to large groups (500-3,000) of people to confirm its effectiveness, monitor long-term side effects and compare to commonly used treatments
Phase IV – studies being conducted after the drug or treatment has been marketed. These studies continue testing long term use side effects and to find alternate uses for approved medications.

Those offered at Thunderbird Internal Medicine Summit Medical Group Arizona will include Phase II, III and IV studies. Clinical trial offices will be located at 5620 W. Thunderbird Road, Bldg B in Glendale.

If you wish to participate in clinical trials, print, complete and sign the registration form. You can drop off the completed form off at any of our locations, hand it to your provider during your next visit or fax it to 480-820-5521.
The key to prevention and early detection of colon cancer, this potentially life-saving test detects colon cancer, polyps and other diseases of the colon. For average risk individuals, the first colonoscopy should be performed at age 50. download the information packet
Echocardiogram (ECHO)
A type of ultrasound of the heart that provides detailed information on how the heart is pumping, how the valves are functioning, and if there is any evidence of enlargement or thickening of the heart chambers or walls. It may be ordered when a murmur is suspected or if there is evidence of abnormalities on the EKG.
Electrocardiogram (EKG)
This diagnostic test traces the electrical activity of the heart and is one way of evaluating rhythm problems, coronary disease or heart enlargement. A baseline study can give your provider the ability to compare should new symptoms develop in the future.
Electromyogram (EMG) and Nerve Conduction Studies
These electrical tests of targeted nerves and muscles measure the point at which pain, numbness and/or weakness originate and help your physician determine how well your spinal cord, nerve roots, muscles and nerves are working.
The average person waits six years before dealing with hearing loss. An experienced audiologist will perform hearing testing and evaluate treatment options which may include hearing aids.
Learn more »
Hemorrhoid Clinic
Thunderbird Internal Medicine Summit Medical Group Arizona now offers regular Hemorrhoid Clinics led by colon-rectal specialists Ariel Forstner-Barthell MD and Elizabeth McConnell, MD.
A common health concern, hemorrhoids occur when blood vessels inside the anal canal swell causing pain and sometimes bleeding. While many can be treated through dietary changes and medication, some require laser treatment or surgery.
Due to the frequency of this diagnosis among our patients, Thunderbird Internal Medicine has set up the following clinic schedule:
5620 W. Thunderbird Road, #G-2, Glendale 85306
            First Wednesday of each month
            1 – 3 pm
            Elizabeth McConnell, MD
            Last Wednesday of each month
            1 – 4:30 p.m.
            Ariel Forstner-Barthell MD
9150 W. Indian School Road, #118, Phoenix 85037
            Third Wednesday of each month
            3 – 5 pm
            Elizabeth McConnell, MD
Diagnosis and treatment is usually completed during the same visit.  To schedule, call 602-938-6960.
A chest x-ray is often ordered in cases of respiratory infection, fever, heart disease or if you are short of breath. Chest x-rays are performed at our Indian School campus.

Abdominal ultrasounds (particularly useful in evaluating the gallbladder, kidneys, liver, and pancreas) may be ordered in cases of abdominal pain, flank pain, or due to symptoms that your provider may deem necessary.

An Arterial Doppler is a diagnostic test of the arterial blood flow, it is often used to evaluate the carotid arteries (the main arteries in the neck supplying blood to the brain) or the arteries of the legs. It may be ordered when there is suspicion on exam or with symptoms suggestive of blockage.
We have a full-service laboratory where most of the routine blood and urine testing is performed.

Neurology is the medical specialty that diagnoses and treats disorders of the brain, spinal cord and nerves. Our neurologists, Darry Johnson, MD and Thomas Habiger, MD care for adults facing both chronic and complex conditions.

Among the common neurological disorders are:

  • Alzheimer's disease and other forms of dementia
  • Migraines and other headache types
  • Peripheral neuropathy, restless legs syndrome, Parkinson's disease and other movement disorders
  • Seizures and epilepsy
  • Multiple sclerosis
  • Neuropathic pain syndromes
  • TIAs and stroke prevention
  • Dizziness and vertigo

In addition, Dr. Johnson and Dr. Habiger have had long-term success in administering Botox® to help prevent or control chronic migraines and movement disorders.

During a neurological exam, you can expect to be tested on strength, coordination, reflexes and sensation. Further testing, such as electromyograms (EMG) and nerve conduction studies, may be needed to confirm a diagnosis and are performed on-site.


Your diet and nutrition has a huge impact on your health and well-being. To help you achieve optimal benefits from the food you eat every day, Thunderbird IM patients can work with Aubrey Uhling, Registered Dietitian, who provides medical nutritional therapy at the suite C-1 location.

Nutritious foods can help your body combat illness and stay healthy. Certain foods can greatly affect chronic diseases such as diabetes, celiac disease, high blood pressure, gastrointestinal disorders, heart disease or cancer.

Aubrey offers comprehensive medical nutritional therapy and nutrition counseling personalized for every need. Whether it is for weight management, disease-specific diet recommendations or your general well being, she will create a nutritional analysis and provide specific, easy to understand plans to help you achieve results.

The nutritional goal setting, monitoring and follow-up will give you the support you need to make good balanced meal and snack choices. To schedule, call 602-341-5248.


Podiatry is the field of medicine focused on the diagnosis and treatment of conditions of the foot, ankle, and related structures of the leg. Thunderbird Internal Medicine Summit Medical Group Arizona podiatrist, John Tassone, DPM, specializes in diabetic foot care, biomechanics, wound care and diabetic peripheral neuropathy.

Following are common types of foot problems:

  • Ankle instability and injuries
  • Arthritic foot and ankle care
  • Athlete’s foot
  • Bunions, calluses and corns
  • Diabetic peripheral neuropathy
  • Heel pain
  • Toenail - fungus and ingrown

In addition to a thorough discussion of your history, patients can expect an examination of the feet. Depending on the issues identified, Dr. Tassone may test your reflexes, assess gait and foot structure or measure the quality and range of motion. Diagnostic x-rays and/or ultrasound may be ordered to confirm the diagnosis.

Preventive Screenings

Thunderbird Internal Medicine Summit Medical Group Arizona takes the concept of person-centric medical care and preventive health services so seriously that both are part of our mission statement. As part of this commitment to you, a number of health screenings are integrated into your care plan.

What Do the Screenings Include?

Having an understanding of possible adverse health indicators helps us to better understand, and help prevent, issues that can hopefully be avoided later. We are integrating alcohol and depression screenings for all patients and, depending on factors such as age, existing health factors and family history, we may ask you to participate in those that assess cardiac risk, obesity and tobacco use.

By working together at an early stage, the physician-patient partnership can help to recommend small lifestyle changes and/or medication that can avoid or minimize negative outcomes if left untreated.

Are Screenings Costly?

While there is tremendous value in their ability to prevent disease and optimize patients’ future health, there may be out-of-pocket costs associated with these screenings depending on your health plan. If so, the amount paid may be counted toward your annual deductible.

Pulmonary Function
Lung function tests may be ordered when a person is experiencing shortness of breath or if there is suspected lung disease. This screening modality gives your provider detailed information on your ability to move air in and out of your lungs.
Sleep Studies
Sleep deprivation and other sleep issues are linked to heart disease, depression, obesity and lower life expectancy. If you are unable to fall asleep, awaken for long periods during the night or wake up too early or not feeling rested, then you’re not alone. In the U.S., more than 70 million people suffer from chronic, severe sleep disorders.

If you experience daytime sleepiness, irregular breathing during sleep, nighttime gasping, choking or coughing, frequent nocturnal urination, morning headaches, gastro-esophageal reflux, depression or hypertension, you may be a candidate for a sleep study.

Depending on your symptoms, your provider will make a recommendation between one of two different types of studies:
  • Overnight Sleep Study. Also called a polysomnogram, is a procedure which monitors body functions such as brain waves, heart rate, leg movements and breathing during sleep. You will be monitored by a sleep technologist all night long. The data obtained will be reviewed by a qualified physician who will provide a diagnosis.
  • At Home Sleep Study. SNAP® Diagnostic offers a Home Sleep Recorder which monitors blood oxygen levels, heart rate and snoring for one night and is then returned for analysis.

We have been serving patients with sleep disturbances for a number of years. Thunderbird Internal Medicine Summit Medical Group Arizona currently offers Home Sleep Studies, which are read and interpreted by a board-certified Sleep Physician.
Our Providers
Dr. Warfield and the staff are wonderful. Always very pleasant and thorough.