Diagnostic and Laboratory Services

Understanding what is happening inside your body is the first step to making you feel better. Our diagnostic services offered to patients – even after hours – are the tools needed to properly determine your condition and begin the road to recovery. From lab work and laboratory services to imaging and sleep studies, our goal is timely results.

Some diagnostic services require a prescription from your doctor and depending on your test you may be required to schedule an appointment. For tests such as x-rays and blood-work, you may simply walk-in for service. Please be sure to obtain all referrals and bring prescriptions or doctor’s orders if you are making the appointment yourself.

Imaging and Radiology

At GRMC, we provide diagnostic, therapeutic and consultative radiologic services using the latest advanced technology.

As a diagnostic hospital, we offer a wide range of tests and screenings to determine the source of your condition in order to properly treat a variety of diagnoses. You don’t have to go to a diagnostic clinic, GRMC offers a wide range of services.

  • Imaging Services Include
  • 128-Slice Computed Tomography (CT)
  • Mammography and 3D Mammography
  • Magnetic Resonance Imaging (MRI)
  • Digital, Cardiovascular and Maternal Fetal Medicine Ultrasound (US)
  • Nuclear Medicine
  • Bone Density Testing
  • Calcium Scoring
  • Stress Echocardiogram
  • Transesophageal Echocardiogram

For more information call 830.401.7850


Cardiovascular services offered at GRMC include catheterization lab, interventional radiology, cardiopulmonary, and cardiac rehabilitation. Learn more about our cardiovascular services.

Lab Services

At GRMC lab services play a vital role in the diagnosis and treatment of patients. Your physician may order you a specific lab to get a better understanding of your health. You don’t have to go to a laboratory clinic. GRMC also offers:

  • Employment related examinations; including drug screening and breath alcohol testing are available

Outpatient Lab Hours – Monday -Friday 6:30 am -5:30 pm. All phlebotomy/exam rooms are private for your comfort.

For more information call 830.401.7654

Infusion Therapy

Infusion therapy involves the administration of medication through a needle or catheter. It is prescribed when a patient’s condition is so severe that it cannot be treated effectively with oral medication. Infusion therapy is available for both hospitalized patients, as well as those who do not require hospitalization but need to receive treatments on a regular or infrequent basis.

Treatments offered:

  • Arthritis
  • Blood transfusions
  • Chemotherapy
  • Dehydration
  • Injections
  • IV for Antibiotics
  • Osteoporosis

For more information call 830.401.6199


At times, a good way to examine the body is from the inside. Both endoscopies and colonoscopies are performed at GRMC to examine, diagnose and treat conditions of gastroenterological conditions, such as:

  • Colon
  • Common bile duct
  • Esophagus
  • Stomach

For more information call 830.401.7441

Sleep Studies

GRMC understands the importance of a good night’s sleep to your health. If you or a loved one has trouble sleeping, it can affect productivity, your mood, and even lead to serious health conditions and syndromes. The Sleep Center at GRMC – in conjunction with South Texas Sleep Diagnostics – is a program that offers a comfortable environment for the diagnosis of:

  • Insomnia
  • Narcolepsy
  • Sleep apnea
  • Restless leg syndrome

GRMC also offers At-home Sleep Studies including:

  • Stardust – Small multi-functioning recording device which collects and stores up to 8.5 hours of patient data in one session

Sleep Screen Quiz    Epworth Sleepiness Scale

For more information call 866.575.3372

Meet the Physician

Dr. Marc Franklin is a board-certified otolaryngologist, specializing in all aspects of general otolaryngology, with specific interest in pediatric and adult sinus disease, Parotid and thyroid gland tumors, hearing and balance disorders and management of sleep disorders. Dr. Franklin is a native Texan and completed his medical degree and residency training in Otolaryngology through UT Medicine-San Antonio.

His vast education, knowledge, and experience allow him to provide his patients with superior health care. He is also known for his empathetic bedside manner and for tailoring care to address the individual needs of each patient.

Dr. Franklin is an active participant in both the medical and local community and a member of several professional organizations including:

  • American Academy of Otolaryngology
  • Texas Medical Association
  • Comal Medical Society

Listen to KWED interview about Sleep Diagnostics