Introduction – Endocrinologist in Rockville, Montgomery County, Maryland

As an ABIM board-certified endocrinologist in Montgomery County, Maryland, I am dedicated to optimizing the health of my community through specialized care for hormonal and metabolic disorders.

Conveniently located in Rockville, my practice provides virtual and in-person services, extending support to nearby areas such as Chevy Chase, Bethesda, North Bethesda, Potomac, North Potomac, Gaithersburg, Germantown, Frederick, Silver Spring, Northern Virginia, Howard County, Anne Arundel, and the Eastern Shore of Maryland for comprehensive care.

I diagnose and treat conditions such as diabetes, thyroid disorders, and hormonal imbalances. Working in collaboration with my patients, I provide education, support, and personalized treatment plans to enhance their overall well-being and quality of life.

The Field of Endocrinology

Endocrinology is a specialized discipline of medicine. Built upon the endocrine system, it is dedicated to the study of hormonal function and the disorders stemming from hormonal excesses or deficiencies.

Hormones are chemical messengers produced by various glands in the body, collectively known as the endocrine system. Endocrinologists are medical professionals who specialize in diagnosing, treating, and managing conditions that involve hormonal disruptions or imbalances.

The field of endocrinology encompasses a wide range of areas, including disorders related to metabolism, the thyroid, adrenal glands, the pituitary gland, the reproductive system, diabetes, and more.

Endocrinologists employ a combination of diagnostic tests (as discussed in the biochemical testing section), medications, hormone therapies, and lifestyle interventions to assist patients in achieving balanced hormones for optimal health.

Below, we’ll take a closer look at the essential role of the endocrine system, on which the field of endocrinology is built. Additionally, we’ll explore circumstances where this intricate system encounters errors, leading to various endocrine anomalies that can affect one’s health and well-being.

The Endocrine System – The Natural or Normal State of Being

The endocrine system is a complex network of glands and organs in the human body that produces, releases, and receives hormones. Hormones are chemical messengers that regulate various physiological processes that ultimately achieve and maintain homeostasis. The key components of the endocrine system include:

Dr. Tashko delivers a comprehensive overview of the endocrine system, covering glands, hormones, and their roles in regulating bodily functions and maintaining homeostasis for optimal health.


These are specialized organs that secrete hormones directly into the bloodstream. Major endocrine glands include the thyroid gland, adrenal glands, pancreas, pituitary gland, and gonads (ovaries in females and testes in males).

  • Pituitary: Often referred to as the “master gland,” it’s located at the base of the brain and controls the function of many other endocrine glands. It secretes hormones that regulate growth, reproduction, and various metabolic processes.
  • Thyroid: Located in the neck, the thyroid gland produces hormones (T3 and T4) that regulate metabolism. An overactive thyroid (hyperthyroidism) or underactive thyroid (hypothyroidism) can lead to significant health issues.
  • Adrenals: Situated on top of each kidney, the adrenal glands produce hormones like cortisol and adrenaline. These hormones are crucial for managing stress, blood pressure, and the body’s response to emergencies.
  • Pancreas: The pancreas serves a dual role as an endocrine and exocrine gland. It produces insulin and glucagon, which help regulate blood sugar levels. Dysregulation of these hormones can lead to diabetes.
  • Gonads (Ovaries and Testes): In females, the ovaries produce estrogen and progesterone, influencing reproductive health and secondary sexual characteristics. In males, the testes produce testosterone, affecting sexual development and function.
  • Parathyroids: These tiny glands, usually four in number, are located on the back of the thyroid gland. They secrete parathyroid hormone (PTH), which regulates calcium levels in the blood and is crucial for bone health and nerve function.


Hormones serve as chemical messengers, conveying molecular information from one organ to another to regulate natural processes and maintain the body’s overall equilibrium and adaptability to changing environments. These chemical messengers, produced by endocrine glands as discussed earlier, play a pivotal role in controlling functions like metabolism, growth, mood, and stress responses. Here, we’ll introduce some typical hormones crucial for the human body.

  • Insulin: Regulates blood sugar levels by promoting the uptake of glucose by cells for energy or storage.
  • Cortisol: Controls metabolism, immune responses, and the body’s reaction to stress.
  • Adrenaline (Epinephrine): Triggers the “fight or flight” response, increasing heart rate, and redirecting blood flow to essential organs during emergencies.
  • Thyroid Hormones (T3 and T4): Influence metabolism, body temperature, and energy production.
  • Growth Hormone: Stimulates growth and cell reproduction.
  • Estrogen and Progesterone: Regulate the menstrual cycle, pregnancy, and secondary sexual characteristics in females.
  • Testosterone: Plays a key role in male sexual development, muscle mass, and bone density.
  • Aldosterone: Controls salt and water balance in the body, influencing blood pressure and electrolyte levels.
  • Parathyroid Hormone (PTH): Regulates calcium levels in the blood, essential for bone health and nerve function.
  • Calcitonin: Regulates calcium levels in the blood by promoting the uptake of calcium into bones, counteracting the action of parathyroid hormone.
  • Vasopressin (Antidiuretic Hormone): Regulates water balance in the body by controlling the reabsorption of water in the kidneys, helping to maintain blood pressure and prevent dehydration.
  • Leptin: Signals to the brain when you’ve had enough to eat, helping to regulate appetite and body weight.

Target Organs

Each hormone has specific target cells or organs where it exerts its effects. For example, in the CRH-ACTH-Cortisol axis, target organs play a pivotal role in the body’s response to stress. Corticotropin-releasing hormone (CRH) is released by the hypothalamus in response to stressors, stimulating the anterior pituitary gland to produce adrenocorticotropic hormone (ACTH). 

ACTH then travels through the bloodstream to target the adrenal glands. Here, cortisol, often referred to as the stress hormone, is synthesized and released. Cortisol’s target organs include the liver, muscles, and adipose tissue. Its effects include increasing blood sugar levels, suppressing the immune system, and aiding in the body’s stress response. This axis highlights how target organs in this context are central to the body’s adaptation to stress.

Feedback Loops

The endocrine system plays a pivotal role in the body by precisely utilizing feedback mechanisms, mainly negative feedback loops, to coordinate the production, release, and reception of hormones, thereby ensuring overall balance and well-being.

A clear example of this regulatory process involves blood sugar control: after a meal, the pancreas releases insulin, encouraging cells to absorb glucose for energy or storage, thereby reducing high blood sugar levels. Conversely, during periods of fasting or physical activity, the pancreas releases glucagon, instructing the liver to release stored glucose, elevating blood sugar levels. 

These feedback loops not only ensure stability but also adapt to changing environments, preventing hormone levels from reaching extremes and optimizing resource use. This intricate system highlights the endocrine system’s essential role in upholding overall physiological equilibrium.

Overall, the endocrine system plays a vital role in controlling processes such as metabolism, growth and development, immune function, mood regulation, and responses to stress. It works in close coordination with the nervous system to ensure that the body functions optimally and adapts to changing environments.

Endocrine Disorders – The Abnormal or Diseased State of Being

Endocrine disorders refer to a group of medical illnesses characterized by disruptions in the endocrine system. These disorders result from hormonal imbalances or dysfunctions within the endocrine glands or the target organs that hormones affect. Below, you’ll find a list of common endocrine conditions.

  • Diabetes Mellitus: Diabetes arises from inadequate insulin action or production, causing elevated blood sugar levels and impacting overall health.
  • Dyslipidemia: Hormonal imbalances, especially insulin resistance, lead to abnormal cholesterol and triglyceride levels, elevating heart disease risk.
  • Hypertension (High Blood Pressure): Hormonal influences, like the renin-angiotensin-aldosterone system, contribute to high blood pressure, increasing cardiovascular risks.
  • Obesity: Hormones regulate appetite and metabolism. Hormonal disruptions, like leptin resistance, contribute to excessive body fat, impacting health.
  • Hypothyroidism: Thyroid dysfunction results in fatigue, weight gain, and other symptoms due to inadequate thyroid hormone production.
  • Hyperthyroidism: Overactive thyroid glands cause symptoms like weight loss, anxiety, and a rapid heart rate.
  • Adrenal Disorders: Conditions such as Cushing’s syndrome (excess cortisol) or Addison’s disease (insufficient cortisol) affect metabolism and stress responses.
  • Polycystic Ovary Syndrome (PCOS): Hormonal imbalances in PCOS lead to irregular menstrual cycles, ovarian cysts, and fertility issues.
  • Osteoporosis: Reduced bone density due to hormonal changes. It mainly affects postmenopausal women and the elderly, increasing fracture risk.
  • Growth Hormone Deficiency: Inadequate growth hormone production leads to stunted growth in children and various health issues in adults.
  • Thyroid Nodules: Abnormal thyroid growths, sometimes cancerous, disrupt thyroid hormones and may cause complications.
  • Pituitary Tumors: Tumors on the pituitary gland disturb hormone production, resulting in diverse symptoms depending on affected hormones.

Understanding the complexities of the endocrine system is a prerequisite for diagnosing and treating these Illnesses. Endocrinologists, with their specialized knowledge, play a vital role in helping individuals maintain hormonal balance and overall health.

Biochemical Testing

Dr. Tashko provides comprehensive hormone testing services, aiding in diagnosing hormonal imbalances and guiding tailored treatment plans for patients' health and well-being.

Endocrinology, as a biochemical field, heavily relies on laboratory testing for the diagnosis and treatment of various hormonal anomalies and disorders. It is within the controlled laboratory setting that we, as endocrinologists, delve into the intricacies of the endocrine system. Using blood, urine, interstitium, and saliva samples, we meticulously measure hormone levels, assess organ function, and identify any deviations from the norm.

For example, in the case of primary adrenal insufficiency, also known as Addison’s disease, laboratory tests are essential. This condition occurs when the adrenal glands fail to produce adequate cortisol, a crucial stress hormone.

To diagnose it, we, as endocrinologists, measure levels of adrenocorticotropic hormone (ACTH), cortisol, sodium, and potassium in the patient’s blood. In Addison’s disease, ACTH levels are elevated as the body tries to stimulate the malfunctioning adrenal glands. Meanwhile, cortisol levels are abnormally low, and imbalances in sodium (hyponatremia) and potassium (hyperkalemia) can occur.

The precise quantification of serum ACTH, cortisol, sodium, and potassium guides us in confirming the diagnosis and tailoring appropriate hormone replacement therapies, highlighting the pivotal role of laboratory testing in the field of endocrinology.


Endocrinology, a specialized field of medicine, focuses on hormones and their impact on health. As endocrinologists, we diagnose and treat hormonal disorders such as diabetes and thyroid issues through personalized care, medication, hormone therapy, and lifestyle changes. We help patients achieve hormonal balance, ensuring overall well-being and optimal bodily functions.

Dr. Tashko

Dr. Tashko is an ABIM board-certified endocrinologist with additional certifications in lipidology, hypertension, and obesity medicine. He delivers personalized, holistic care to patients in Montgomery County, Maryland.