- Labs give your provider a fuller picture of your metabolic health and treatment safety, reviewed alongside your symptoms, history, and goals rather than in isolation.
- Weight loss medications like GLP-1s are usually prescribed only after an evaluation and eligibility review, not automatically at the first visit.
- An abnormal lab result usually changes the sequence or type of treatment rather than ruling medication out entirely.
- Insulin resistance is a metabolic process that can occur before glucose or A1C levels become abnormal, so it's not the same as having diabetes.
If you've spent years trying to manage your weight on your own, being told you need labs before you can even talk about medication can feel like one more frustrating delay. Put simply, labs give your provider information about your metabolic health, possible contributors to your weight changes, and conditions that could affect which treatments are safest for you. Labs are meant to be reviewed alongside your symptoms, history, medications, and goals with a provider who can help you make sense of the whole picture.
At Visana Health, we don't automatically prescribe weight loss medication at your first visit. GLP-1 (glucagon-like peptide-1) medications and other weight loss medications may be prescribed once it's clinically appropriate: after a provider evaluates you and reviews your eligibility, looking at your labs alongside your history, symptoms, current medications, and goals. The goal is a treatment decision based on your individual health, not simply your weight or a single lab result.
Baseline testing before treatment starts is important because it:
- Identifies conditions that may affect your weight, your overall health, or need their own treatment
- Checks organ function and other factors that influence which treatments are appropriate
- Establishes a baseline to track against as you're monitored over time
- Helps you and your provider choose among treatment options and figure out what to address first
This isn't unique to Visana's approach. The 2026 American Diabetes Association (ADA) obesity care standards describe lab evaluation the same way: part of assessing obesity-related complications, possible secondary causes of weight gain, and factors that shape treatment planning.1
Common labs and what they may show
Not every person needs every test: what's appropriate for you depends on your symptoms, history, medications, risk factors, reproductive considerations, and the treatment being considered. Here is a list of common lab tests and what they tell your provider.
A note on insulin-resistance testing specifically: methods like fasting insulin or a calculated index (sometimes called HOMA-IR) aren't a routine, required test before weight loss medication. When your provider does use one, it's additional metabolic information, not a definitive test — no single insulin number determines whether you "deserve" or qualify for a GLP-1. Which tests get ordered depends on your symptoms, history, and risk factors; the 2026 ADA standards point to A1C, lipid testing, kidney function, liver-related testing, and selected thyroid testing as the ones most likely to be appropriate in obesity care.
What happens after your labs
Your care team reviews results alongside your symptoms, history, medications, risk factors, and goals. A lab result is one part of the picture, not a diagnosis or treatment plan on its own. An abnormal result doesn't automatically mean "no medication"; more often, it changes what happens before, alongside, or as part of treatment.
Ready to get the full picture of your health?
Understanding your labs is the first step toward a treatment plan built around you — not a generic weight loss protocol. Book a visit with a Visana provider to get evaluated, ask your questions, and find out what your body actually needs. Book Appointment
1. Diabetes Care. Screening, Diagnosis, Evaluation, and Staging of Obesity in Adults: Standards of Care in Overweight and Obesity—2026. docm-care, vol. 1, no. 4, p. 536. https://diabetesjournals.org/docm-care/article/1/4/536/170058/Screening-Diagnosis-Evaluation-and-Staging-of
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