Welcome to Tri-City Endocrinology
Chris K. Guerin, M.D. and Alan B. Douglass, M.D.

Tri-City Endocrinology and Metabolism delivers a broad range of services for hormone-related disorders and diabetes with a focus on excellent service.  Serving the North County since 1983, our goal is to deliver state-of-the-art treatment with an approach that is both practical and customized to your needs.  Dr. Chris K. Guerin and Dr. Alan B. Douglass offer the highest standard of endocrine and diabetes-related care.

Tri-City Endocrinology is currently welcoming new patients.  Please call our office to schedule an appointment


Our Location




3927 Waring Rd. Ste. C
Oceanside CA. 92056
Click Here For Map
Business Hours
8:00 AM to 4:00 PM Monday through Friday
(760) 941-9850
(760) 941-9845 FAX






  What We Offer
  • Patient Portal Coming Soon!

    Our patient portal provides a new way for you to interact with our office. To access the portal, click here!

  • Thyroid Ultrasound available

    We have the latest technology to image your thyroid gland in our office. This enables more accurate diagnosis and precise biopsies.

  • Diabetes clinical research

    Our clinic actively participates in clinical research studies. Please call our office for more information.


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