About
Dr. Lucian Donald Sitwell, a respected Internist / Geriatrician, focuses on evidence-based medicine and personalized care plans. Practicing in Ottawa, ON, he serves the surrounding communities with a commitment to delivering comprehensive and patient-centered healthcare. His practice is aligned with the standards and ethical guidelines established by the College of Physicians and Surgeons of Ontario (CPSO). Dr. Sitwell specializes in managing complex adult health conditions, with particular expertise in geriatric medicine, ensuring that older adults receive appropriate, holistic care tailored to their unique needs.
He graduated with a Medical Degree from the University of Ottawa in 1983 and has completed extensive post-graduate medical training, including residency in Internal Medicine and specialized fellowship training in Geriatric Medicine. His credentials reflect a deep commitment to ongoing professional development and adherence to the highest standards of medical practice in Ontario.
Dr. Sitwell's clinical philosophy emphasizes professionalism, clinical excellence, and compassionate care. He is dedicated to serving the Ottawa community and speaks English fluently. His approach integrates the latest evidence-based practices with a personalized understanding of each patient's circumstances, fostering trust and optimal health outcomes.

Dr. Sitwell provides expert care for adults with a wide range of medical conditions, including:
Endocrine & Metabolic Disorders
- Calcium and Parathyroid Disorders: Evaluation and management of conditions related to abnormal calcium levels and parathyroid gland function.
- Adrenal Gland Disorders: Diagnosis and management of conditions affecting the adrenal glands, such as adrenal insufficiency.
- Thyroid Disorders: Management of hypothyroidism, hyperthyroidism, thyroid nodules, and other thyroid conditions.
Select Infectious & Inflammatory Conditions
- Evaluation of Inflammatory Markers: Investigating elevated inflammatory markers (like ESR or CRP) to identify potential underlying systemic conditions.
- Complex Infections Consultation: Providing diagnostic and management expertise for challenging infections, often in consultation with primary care.
- Fever of Unknown Origin (FUO) Workup: Systematic investigation to determine the cause of prolonged, unexplained fevers.
Complex Diagnostic & Multi-System Issues
- Evaluation of Undifferentiated Symptoms: Investigating complex presentations like fatigue, weight loss, or pain without a clear diagnosis.
- Perioperative Medical Optimization: Pre-surgical assessment and management of medical conditions to minimize operative risks and ensure smoother recovery.
- Management of Patients with Multiple Comorbidities: Coordinating care and treatment plans for individuals managing several complex health conditions simultaneously.
Dr. Sitwell manages a wide range of complex adult and geriatric health conditions. This list highlights common areas of focus. If your condition is not listed, please note that internal medicine specialists address diverse and often multi-systemic diseases. Consultation is typically initiated via referral from your primary care physician.
- Advance Care Planning Discussions: Facilitating conversations about future healthcare preferences and goals of care, including discussions about powers of attorney for personal care.
- Cognitive and Memory Assessment: Detailed evaluation for concerns about memory loss or changes in thinking; diagnosis and management of dementia and mild cognitive impairment.
- Frailty Evaluation and Management: Assessing for frailty (increased vulnerability) and developing interventions to enhance resilience, function, and independence.
- Perioperative Medical Consultation: Assessing and managing medical risks (e.g., cardiac, respiratory) for patients undergoing surgery to ensure safety and optimize post-operative recovery.
- Comprehensive Geriatric Assessment (CGA): A holistic, multidimensional evaluation tailored to older adults, assessing medical conditions, functional ability, cognition, mood, nutrition, social support, and medication use.
Note: This list represents some of the key services offered by Dr. Sitwell. As a specialist in Internal Medicine and Geriatric Care, he provides comprehensive diagnostic and management services. For specific inquiries about whether your condition falls within Dr. Sitwell's scope of practice, please discuss with your referring physician or contact the clinic.
All medical services are provided in accordance with the standards of practice set by the College of Physicians and Surgeons of Ontario (CPSO).
Dr. Sitwell's practice is situated in the Elmvale Acres, Hawthorne Meadows, and Billings Bridge neighborhoods of Ottawa. The location offers convenient access for patients from nearby areas, including Westboro Beach and along the Ottawa River Pathway. Patients can reach the clinic via OC Transpo, including O-Train LRT and bus services. The facility is wheelchair accessible. Parking is available at the facility.
- How is payment handled for appointments with Dr. Sitwell? Is it covered by Ontario Health Insurance Plan (OHIP)?
- In ON, medical consultations with specialists like Dr. Sitwell are typically covered by your provincial health insurance (Ontario Health Insurance Plan (OHIP)) when you present a valid health card and have the required referral. You generally do not pay directly for the consultation service itself. Some specific procedures, forms, or administrative tasks might not be covered by Ontario Health Insurance Plan (OHIP) and may incur a separate fee according to provincial guidelines. Please inquire if you have questions about uninsured services.
- Can I book an appointment directly or do I absolutely need a referral?
- A referral from your family physician or another medical specialist is required to see Dr. Sitwell. As experts in Internal Medicine and Geriatric Care, Internists and Geriatricians see patients based on specific medical questions posed by the referring doctor. This ensures continuity of care and that the consultation is appropriate for your needs. Please have your doctor forward the referral information.
- What are typical wait times for an appointment?
- Wait times for specialist appointments can vary significantly depending on the urgency of the referral, the volume of requests, and Dr. Sitwell's availability. Our office prioritizes referrals based on medical need. We strive to see patients as promptly as possible and will contact you once the referral is processed to schedule an appointment. You can inquire about approximate wait times when booking.
- What exactly does an Internist (Internal Medicine Specialist) do?
- An Internist is a medical doctor who specializes in diagnosing, treating, and preventing complex diseases primarily in adults. They are experts in managing conditions affecting multiple organ systems (Thyroid Disorders, Dyslipidemia (High Cholesterol)), handling challenging diagnostic puzzles, and coordinating care for patients with multiple chronic illnesses. They often serve as consultants to other physicians.
1919 Riverside Drive
Ottawa, ON K1H 1A2
Phone: (613) 739-7268 | Fax: (613) 739-7023
The facility is wheelchair accessible.
Dr. Sitwell is a licensed physician regulated by the College of Physicians and Surgeons of Ontario (CPSO) under the Medicine Act, 1991 in ON. Patients are typically seen by referral from their primary care physician.
Verify registration with the College of Physicians and Surgeons of Ontario (CPSO): https://doctors.cpso.on.ca/DoctorDetails/Sitwell-Lucian-Donald/0038999-52975