About
Dr. John Leonard Preiner is a dedicated Urologist specializing in the diagnosis and treatment of conditions affecting the urinary tract in men and women, and the male reproductive system. Practicing at Sunnybrook Health Sciences Centre in Newmarket, ON, he is an integral part of the local medical community. His practice adheres to the high standards set by the College of Physicians and Surgeons of Ontario (CPSO), ensuring that patients receive safe, effective, and evidence-based urological care. Dr. Preiner provides comprehensive care for a wide range of urological issues, including kidney stones, prostate conditions, bladder problems, and male reproductive health concerns. His approach focuses on understanding each patient’s unique situation to tailor personalized treatment plans, utilizing advanced diagnostic tools and minimally invasive techniques whenever appropriate. The clinic is equipped with modern facilities to deliver thorough and compassionate urological services to adult male and female patients.
He graduated with a Medical Degree from the University of Toronto, Canada, and has over 24 years of experience practicing as a Urologist since 2000. He is recognized as a RCPSC Specialist by the College of Physicians and Surgeons of Ontario (CPSO), ensuring adherence to rigorous certification standards. Throughout his career, Dr. Preiner has dedicated himself to continuing medical education and staying current with the latest developments in urological medicine, which enables him to offer state-of-the-art treatments and surgical options to his patients.
Dr. Preiner’s clinical philosophy emphasizes patient-centered care, utilizing evidence-based practices and advanced minimally invasive techniques where appropriate. He is committed to providing thorough patient education, empowering individuals to make informed decisions about their health. His dedication to the community of Newmarket is reflected in his compassionate approach and his aim to deliver comprehensive urological care with respect, dignity, and professionalism. He provides consultations and ongoing management in English, ensuring clear communication and understanding with his patients.
Dr. John Preiner addresses a wide range of urological conditions, including:
Urologic Cancers
- Prostate Cancer: Cancer that occurs in the prostate — a small walnut-shaped gland in males that produces the seminal fluid.
- Bladder Cancer: Cancer that begins in the cells of the bladder, most commonly in the urothelial cells lining the inside of the bladder.
- Ureteral & Renal Pelvis Cancer: Cancers that form in the urothelial cells lining the ureters (tubes connecting kidneys to bladder) or renal pelvis (funnel-like part of kidney).
General Urologic Symptoms & Disorders
- Urinary Frequency, Urgency & Nocturia: Symptoms of needing to urinate often, suddenly, or frequently during the night, which can indicate various underlying conditions.
- Hematuria (Blood in Urine): Presence of red blood cells in the urine, requiring investigation to determine the cause (e.g., infection, stones, tumors).
- Urinary Tract Infections (UTIs) - Complicated or Recurrent: Infections affecting any part of the urinary system that are frequent, persistent, or associated with underlying factors.
Female Pelvic Health & Urinary Conditions
- Stress Urinary Incontinence (SUI): Involuntary leakage of urine during physical activity like coughing, sneezing, laughing, or exercise.
- Pelvic Organ Prolapse (Cystocele - Bladder Prolapse): When the bladder drops (prolapses) from its normal position in the pelvis and pushes on the wall of the vagina.
- Urge Urinary Incontinence / Overactive Bladder: Sudden, intense urge to urinate followed by involuntary loss of urine.
This list is not exhaustive. For personalized advice regarding your specific urological concerns, please consult with Dr. John Preiner.
- Comprehensive Urological Consultation & Evaluation: In-depth assessment of urinary tract and male reproductive system conditions, including medical history review, physical examination, and diagnostic planning.
- Management of Post-Operative Urological Care: Providing comprehensive follow-up and management after urological surgeries to ensure optimal recovery and outcomes.
- Testicular Cancer Diagnosis, Staging & Management: Including radical inguinal orchiectomy and coordination with oncologists for further therapy.
- Pelvic Organ Prolapse (POP) Urological Aspects & Surgical Repair (e.g., Cystocele Repair): Evaluation and surgical management of bladder prolapse and other urological components of POP, often in collaboration with urogynecologists.
- Kidney Cancer (Renal Cell Carcinoma) Diagnosis & Surgical Treatment: Including partial and radical nephrectomy (open, laparoscopic, robotic).
- Overactive Bladder (OAB) Management in Women: Treatment strategies for urinary urgency, frequency, and urge incontinence, including medications and neuromodulation.
- Laser Surgery for Urological Conditions: Employing various laser technologies for treatments such as BPH (e.g., HoLEP, GreenLight), kidney stones, and bladder tumors.
Note: This list provides a general overview. Treatment plans are individualized. Discuss with Dr. Preiner for care relevant to your needs.
All medical services are provided in accordance with the standards of practice set by the College of Physicians and Surgeons of Ontario (CPSO) and relevant urological care guidelines. Contact the clinic regarding new patient intake and referral processes.
Sunnybrook Health Sciences Centre is situated in Newmarket’s Summerhill Estates, Armitage neighborhood, serving a vibrant community close to prominent landmarks such as the Commercial Corridor and Upper Canada Mall. The practice is easily accessible via public transit, with York Region Transit (YRT) / Viva routes connecting the area conveniently. The facility is wheelchair accessible, ensuring ease of access for all patients. Paid parking options are conveniently located nearby, providing flexible options for patients attending appointments. The clinic’s strategic location allows residents of Newmarket and surrounding areas to access comprehensive urological care within a modern, welcoming environment.
- Are consultations and treatments with Dr. Preiner, a Urologist, covered by Ontario Health Insurance Plan (OHIP) in ON?
- Medically necessary consultations with a licensed Urologist like Dr. Preiner, as well as most diagnostic tests (e.g., cystoscopy, urodynamics) and provincially insured surgical procedures, are generally covered by Ontario Health Insurance Plan (OHIP) in ON when a referral from a family doctor or another specialist is in place. Some newer technologies, medications, or elective procedures (like cosmetic urology or certain non-insured infertility treatments) may not be covered or may require special authorization. It's always recommended to discuss coverage specifics with Dr. Preiner's office or Ontario Health Insurance Plan (OHIP).
- Do I need a referral to see Dr. Preiner, a Urologist?
- Yes, for most urological consultations and treatments covered by provincial health plans in ON, a referral from your family physician or another specialist is typically required to see a Urologist like Dr. Preiner. This ensures your care is coordinated and appropriate. Some specific services, like vasectomy in certain private clinic settings, might occasionally be accessed directly, but for general urological assessment or provincially insured care, a referral is the standard pathway.
- What does a Urologist like Dr. Preiner specialize in?
- A Urologist is a medical doctor who specializes in diagnosing and treating conditions of the urinary tract in both males and females, as well as conditions of the male reproductive system. This includes organs like the kidneys, adrenal glands, ureters, urinary bladder, urethra, and the male reproductive organs (testes, epididymis, vas deferens, seminal vesicles, prostate, and penis). He is a Urologist specializing in conditions of the urinary tract and male reproductive system. Dr. Preiner provides comprehensive care for a wide range of these conditions.
- What are the treatment options for an enlarged prostate (BPH)?
- Treatment for Benign Prostatic Hyperplasia (BPH) depends on the severity of your symptoms and how much they affect your quality of life. Options range from lifestyle changes and medications to minimally invasive procedures (like UroLift, Rezum) and surgical treatments (such as TURP or laser prostatectomy). Dr. Preiner can discuss the most suitable options for you based on your individual circumstances.
- What are kidney stones and how does Dr. Preiner treat them?
- Kidney stones are hard deposits made of minerals and salts that form inside your kidneys. They can cause severe pain when they pass through your urinary tract. Treatment depends on the stone's size, type, and location. Small stones may pass on their own with increased fluid intake and pain medication. Larger stones or those causing significant symptoms might require procedures like Extracorporeal Shock Wave Lithotripsy (ESWL) to break them up, ureteroscopy with laser to remove or break them, or percutaneous nephrolithotomy (PCNL) for very large stones. Dr. Preiner will also work with you on strategies to prevent future stones.
- What can be done for urinary incontinence?
- Urinary incontinence (loss of bladder control) is a common and often treatable condition. Treatment depends on the type of incontinence (stress, urge, mixed, overflow). Options may include lifestyle changes (e.g., fluid management, bladder training), pelvic floor muscle exercises (Kegels), medications, medical devices (like pessaries for women), nerve stimulation, or surgical procedures (such as sling surgery for stress incontinence). Dr. Preiner can help determine the cause and best treatment plan for you.
Sunnybrook Health Sciences Centre
Room 388, 216-16700 Bayview Ave, Kidney Centre at CNIB
Newmarket, ON L3X 1W1
Phone: (905) 954-0307 | Fax: (905) 952-0520
The facility is wheelchair accessible.
Dr. Preiner is a licensed Urologist regulated by the College of Physicians and Surgeons of Ontario (CPSO) under the Regulated Health Professions Act, 1991 and Medicine Act, 1991 in ON. A referral from a family physician is typically required for consultations with Dr. Preiner for services covered by the provincial health plan.
Verify registration with the College of Physicians and Surgeons of Ontario (CPSO): https://doctors.cpso.on.ca/DoctorDetails/Preiner-John-Leonard/0052509-66473