OSF Saint Luke Medical Center

Diabetes & Endocrinology

Diabetes is a complicated disease that impacts every aspect of your life and places you at higher risk for serious complications. A person can’t control diabetes if they don’t understand it.

Do you need help managing your diabetes?

At OSF Medical Group – Diabetes & Endocrinology in Kewanee, our Advance Practice Nurse, Certified Diabetic Educator nurse and dietitian work closely with your primary care provider to offer you the best care. 


To help manage your diabetes, we evaluate your needs and offer a plan tailored to your individual unique lifestyle. Some of our comprehensive services include:

  • Diabetes care and management education
  • Insulin pump management
  • Continuous glucose monitoring
  • Self-care and self-management
  • Medical nutrition therapy

Location, hours and contact information

OSF Medical Group – Diabetes & Endocrinology is located within OSF HealthCare Saint Luke Medical Center in Kewanee. To access this office, please use the driveway at the main entrance of OSF Saint Luke.  

Staff are available Monday-Friday, 8 a.m.-5 p.m. For questions or to schedule an appointment, please call us at (309) 852-7700.

Meet the Team

 Tami Harker

Tami Harker, DNP, BC-ADM, CDE – Advanced Practice Nurse

Tami grew up in Kewanee and "strives each and every day to provide individual and compassionate care to all we serve. I enjoy spending time with our patients and their families getting to know them." Tami has earned a Doctor of Nursing Practice from the University of Illinois at Chicago and is Board Certified in Advanced Diabetes Management and is a Certified Diabetes Educator. 

Tami enjoys spending time with family and friends, cooking and trying new recipes, shopping and traveling.


Sara Umphfleet | OSF Saint Luke

Sara Umphfleet, RD LDN – Clinical Dietitian

Sara is a clinical dietitian who joined OSF HealthCare Saint Luke Medical Center in 2017. She "strives to teach everyone to love, enjoy and share delicious food." 

Sara is originally from Iowa and received her Associate of Arts in Liberal Arts at Des Moines Area Community College. She went on to earn a Bachelor of Science in Dietetics from Iowa State University. She completed a dietetic Internship through Iowa State University with rotations in Illinois, Iowa and Nebraska. Sara is a member of multiple dietitian practice groups including diabetes care and education, medial nutrition and weight management.

"Food is not meant to be feared or be the cause of disease and suffering. Food is one of God's greatest pleasures and connectors. It's meant to nourish every aspect of your life."

In her free time, Sara enjoys creating new recipes and trying new foods.