Dr. Catherine Guertin

Dr. Catherine Guertin diagnoses and treats a wide range of hormonal and metabolic disorders, including:

Diabetes & Related Metabolic Disorders

• Prediabetes & Insulin Resistance: A state where blood glucose levels are higher than normal but not yet high enough for a type 2 diabetes diagnosis. Insulin resistance is a key feature, where cells don't respond well to insulin.
• Hypoglycemia (Low Blood Sugar - various causes): Abnormally low blood glucose levels, which can occur as a side effect of diabetes treatment (insulin or certain oral medications), or due to other underlying conditions like insulinoma or adrenal insufficiency.
• Diabetes Complications (Neuropathy, Nephropathy, Retinopathy - endocrine management aspects): Management focused on glycemic, blood pressure, and lipid control to prevent or slow the progression of nerve damage, kidney disease, and eye damage associated with diabetes.

Bone Health & Mineral Metabolism Disorders

• Vitamin D Deficiency and Insufficiency: Inadequate levels of vitamin D, which is essential for calcium absorption and bone mineralization, leading to potential bone pain, muscle weakness, and increased fracture risk.
• Rickets & Osteomalacia: Conditions characterized by softening and weakening of bones, typically due to severe and prolonged vitamin D deficiency. Rickets occurs in children, leading to skeletal deformities, while osteomalacia occurs in adults.
• Osteoporosis (Postmenopausal, Senile, Glucocorticoid-Induced): A progressive bone disease characterized by decreased bone mass and density, leading to an increased risk of fractures, particularly of the hip, spine, and wrist.

Thyroid & Parathyroid Gland Disorders

• Primary Hyperparathyroidism: A disorder where one or more parathyroid glands become overactive, producing too much parathyroid hormone (PTH), leading to high blood calcium levels (hypercalcemia) and potential bone and kidney problems.
• Thyroid Cancer (Differentiated - Papillary, Follicular; Medullary - follow-up care): Malignant tumors of the thyroid gland. Endocrinologists are involved in post-operative management, hormone suppression, and long-term surveillance.

This list is not exhaustive. For personalized advice regarding your specific endocrine condition, please consult with Dr. Catherine Guertin.

• Inpatient & Outpatient Management of Endocrine Emergencies & Crises: Acute diagnosis and management of potentially life-threatening hormonal imbalances such as diabetic ketoacidosis (DKA), hyperglycemic hyperosmolar state (HHS), thyroid storm, myxedema coma, adrenal crisis, severe hypoglycemia, and acute hyper/hypocalcemia, typically initiated in an emergency or hospital setting with ongoing outpatient follow-up.
• Expert Second Opinion Consultations for Complex or Rare Endocrine Disorders: Providing specialized second opinions on challenging endocrine diagnoses, interpretation of ambiguous hormone test results, or evaluation of complex or multi-faceted treatment plans.
• Genetic Counseling Coordination & Testing for Hereditary Endocrine Neoplasia Syndromes & Familial Disorders: Risk assessment and coordination of genetic testing and counseling for individuals and families with suspected hereditary endocrine tumor syndromes (e.g., Multiple Endocrine Neoplasia - MEN1, MEN2; Von Hippel-Lindau), familial thyroid cancer, or other inherited endocrine conditions.
• Interpretation of Complex Hormonal Assays, Dynamic Endocrine Function Tests & Genetic Markers: Expert analysis and clinical correlation of specialized blood, urine, and saliva tests measuring various hormone levels. Includes interpretation of dynamic stimulation and suppression tests (e.g., ACTH stimulation, dexamethasone suppression, oral glucose tolerance test for acromegaly) to precisely evaluate endocrine gland function and identify genetic predispositions.
• Comprehensive Endocrine System Consultation & Hormonal Health Evaluation: In-depth clinical assessment of potential hormonal imbalances and disorders affecting the endocrine glands (e.g., thyroid, pituitary, adrenal, pancreas, parathyroid, gonads). Includes detailed medical history, family history review, targeted physical examination, analysis of symptoms, and formulation of a personalized diagnostic and management plan.
• Transitional Care for Young Adults with Chronic Endocrine Conditions: Facilitating the smooth transition of adolescents and young adults with lifelong endocrine disorders (e.g., Type 1 diabetes, congenital adrenal hyperplasia, hypopituitarism) from pediatric to adult endocrine care services.

Note: This list provides a general overview. Specific tests and treatments are determined after a thorough evaluation. Discuss with Dr. Guertin for care relevant to your specific condition.

All medical services are provided in accordance with the standards of practice set by the Collège des médecins du Québec (CMQ) and relevant endocrinological care guidelines. Contact the clinic or your referring physician regarding new patient intake and referral processes.

Clinique d'endocrinologie de Trois-Rivières is situated in the vibrant Saint-Louis-de-France Sector neighborhood of Trois-Rivières. The clinic is conveniently accessible via the Industrial Park and Pont Laviolette Access routes. Patients can reach the facility easily using public transit, as the Société de transport de Trois-Rivières (STTR) serves the area. The clinic’s premises are wheelchair accessible to accommodate all patients. Parking is available at or near the facility, ensuring ease of access for those arriving by private vehicle.

Are consultations, hormone tests, and treatments with Dr. Guertin, an Endocrinologist (Diabetes & Metabolism Focus), covered by Régie de l'assurance maladie du Québec (RAMQ) in QC?

Medically necessary consultations with a licensed Endocrinologist (Diabetes & Metabolism Focus) like Dr. Guertin, most standard diagnostic hormone blood tests, dynamic endocrine function tests when indicated, and treatments for provincially insured endocrine conditions (e.g., diabetes, thyroid disorders, adrenal insufficiency, osteoporosis management as per guidelines) are generally covered by Régie de l'assurance maladie du Québec (RAMQ) in QC when a referral from a family doctor or another specialist is in place. Some newer or specialized medications (e.g., certain advanced diabetes drugs, some growth hormone therapies, specific osteoporosis agents), medical devices (like some insulin pumps or continuous glucose monitors and their supplies), or treatments considered primarily for lifestyle or cosmetic reasons may have different coverage criteria or require special authorization. It's crucial to discuss coverage specifics for any proposed investigation or treatment with Dr. Guertin's office, the hospital/clinic, or Régie de l'assurance maladie du Québec (RAMQ) directly.

Is a referral required to see Dr. Guertin, an Endocrinologist (Diabetes & Metabolism Focus)?

Yes, for services covered by the provincial health plan, a referral from your family physician or another specialist (e.g., an internist, pediatrician, or gynecologist) is almost always required to schedule an appointment with an Endocrinologist (Diabetes & Metabolism Focus) such as Dr. Guertin. Endocrine system disorders often involve complex interactions and can have wide-ranging effects, so an initial assessment by your primary care provider helps determine if specialist care is needed and ensures that relevant preliminary tests and medical history are available to the endocrinologist. This facilitates a more focused and efficient consultation.

What treatment options for osteoporosis might Dr. Guertin discuss?

If you are diagnosed with osteoporosis, Dr. Guertin will discuss a management plan aimed at reducing your risk of fractures. This starts with lifestyle modifications, including ensuring adequate intake of calcium and vitamin D (through diet and/or supplements), engaging in regular weight-bearing and muscle-strengthening exercises, smoking cessation, and limiting alcohol intake. Fall prevention strategies are also important. If medication is indicated based on your bone density (DXA scan) and fracture risk assessment (e.g., using FRAX or CAROC tools), options include antiresorptive medications that slow bone loss (like bisphosphonates or denosumab) or anabolic agents that stimulate new bone formation (like teriparatide or romosozumab). She will help choose the most appropriate therapy based on your individual circumstances, potential side effects, and treatment goals.

I have a thyroid nodule. What can I expect during an evaluation with an Endocrinologist like Dr. Guertin?

When evaluating a thyroid nodule, an Endocrinologist like Dr. Guertin will conduct a thorough assessment. This typically involves reviewing your medical history (including any symptoms of thyroid dysfunction or family history of thyroid disease), performing a physical examination of your neck and thyroid gland, and ordering blood tests to check your thyroid function (TSH, and possibly free T4, T3, and thyroid antibodies). A thyroid ultrasound is almost always performed to precisely characterize the nodule's size, number, and sonographic features (e.g., solid, cystic, calcifications, irregular margins). Based on these ultrasound characteristics and the nodule's size, Dr. Guertin will determine if a fine-needle aspiration (FNA) biopsy is needed to obtain cells for microscopic examination to rule out thyroid cancer. Most thyroid nodules are benign.

Clinique d'endocrinologie de Trois-Rivières
5050 boul des Forges
Trois-Rivières, QC G8Y 1X2

Phone: (819) 379-1442

The facility is wheelchair accessible.

Dr. Guertin is a licensed Endocrinologist (Diabetes & Metabolism Focus) regulated by the Collège des médecins du Québec (CMQ) under the Medical Act in QC. A referral from a family physician or appropriate specialist is typically required for consultations with Dr. Guertin for services covered by the provincial health plan.

Verify registration with the Collège des médecins du Québec (CMQ): https://www.cmq.org/en/directory/physicians?number=20161