GLP-1 medications like Ozempic and Wegovy are transforming weight loss and metabolic health outcomes. But with significant changes come significant responsibilities—and a critical need to monitor what's actually happening inside your body. Blood work isn't just a box to tick; it's your window into whether your medication is working optimally and whether any adjustments are needed.
This guide covers the 17 essential biomarkers GLP-1 users should track, why they matter, and how to use these insights to optimize your health journey.
Why Blood Work Matters More on GLP-1
GLP-1 medications don't just suppress appetite—they affect your metabolic function across multiple systems. They influence glucose control, insulin sensitivity, lipid profiles, kidney function, and even nutrient absorption. Some GLP-1 users experience rapid weight loss, which can deplete certain micronutrients. Others may see dramatic improvements in metabolic markers, while a minority might develop unexpected shifts in liver or kidney function.
Without regular blood work, you're flying blind. You might optimize your nutrition perfectly, but miss a deficiency. You might feel great while your liver enzymes are creeping up. Regular testing allows you to see the data and make evidence-based decisions about your protocol.
Testing Frequency Recommendation
- First 3 months: Baseline panel before starting, then every 4-6 weeks
- After 3 months (stabilized): Every 8-12 weeks
- Maintenance phase: Every 12 weeks or annually
- If adjusting dose: Retest 4-6 weeks after changes
The 17 Key Biomarkers to Track
Metabolic Panel (5 markers)
1. Fasting Glucose — The foundation of metabolic health. Optimal range: 70-100 mg/dL. On GLP-1, you should see notable improvements here, particularly if you're pre-diabetic or diabetic.
2. Hemoglobin A1C (HbA1C) — Your 3-month average blood sugar. This is the key metric for diabetes management. Target: below 5.7% (non-diabetic range). GLP-1 users often see drops of 1-2% within 3 months.
3. Fasting Insulin — Reveals how hard your pancreas is working. Lower is better. Optimal: below 12 mIU/L. GLP-1 improves insulin sensitivity, so expect meaningful decreases.
4. Total Cholesterol — Watch the trend. Rapid weight loss can temporarily raise cholesterol; it usually stabilizes. Target: below 200 mg/dL.
5. LDL Cholesterol — "Bad" cholesterol. Target: below 100 mg/dL (or below 70 if you have cardiovascular risk). Weight loss typically improves this.
Lipid & Cardiovascular Panel (3 markers)
6. HDL Cholesterol — "Good" cholesterol. Higher is better. Target: above 40 mg/dL for men, above 50 mg/dL for women. GLP-1 users often see meaningful increases.
7. Triglycerides — Another cardio risk factor. Target: below 150 mg/dL. Expect substantial improvements with GLP-1 and weight loss.
8. Triglyceride-to-HDL Ratio — A powerful indicator of metabolic health. Ratio below 2 is excellent. This often improves dramatically on GLP-1.
Liver Function (2 markers)
9. AST (Aspartate Aminotransferase) — Enzyme indicating liver stress. Normal: below 40 U/L. Rapid weight loss can temporarily elevate liver enzymes due to fatty liver mobilization.
10. ALT (Alanine Aminotransferase) — Another liver enzyme. Normal: below 40 U/L. More specific to the liver than AST. Monitor closely if you're overweight, as NAFLD (non-alcoholic fatty liver disease) is common.
Kidney Function (2 markers)
11. Creatinine — Indicates kidney function. Normal: 0.6-1.2 mg/dL. Important baseline for GLP-1 users, as some studies suggest monitoring (though kidney problems are rare).
12. eGFR (Estimated Glomerular Filtration Rate) — Better indicator of kidney health than creatinine alone. Normal: above 60 mL/min/1.73m². Your doctor should calculate this.
Thyroid Function (2 markers)
13. TSH (Thyroid Stimulating Hormone) — Controls thyroid function. Normal: 0.4-4.0 mIU/L. GLP-1 may affect thyroid function in some users; monitor if you have thyroid history.
14. Free T4 — Thyroid hormone directly affecting metabolism. Normal: 0.8-1.8 ng/dL. Ensure your thyroid remains stable on medication.
Vitamins & Minerals (3 markers)
15. Vitamin B12 — Critical for energy and nerve function. Target: above 400 pg/mL. Rapid weight loss and reduced food intake can deplete B12. If low, discuss supplementation with your doctor.
16. Vitamin D — Essential for bone health, immunity, and metabolism. Target: 30-100 ng/mL. Many GLP-1 users are deficient; supplementation is often warranted.
17. Iron (Ferritin & Serum Iron) — Oxygen transport and energy. Normal ferritin: 24-336 ng/mL. Low iron can cause fatigue on GLP-1; monitor especially if you reduce red meat intake.
What to Ask Your Doctor
- "Can I get all 17 of these biomarkers tested together?"
- "How do my results compare to healthy ranges vs. my baseline?"
- "Should I supplement anything based on these results?"
- "At what point should we adjust my GLP-1 dose or nutrition protocol?"
Making Sense of Your Results
The real value in blood work emerges when you track trends. A single glucose reading tells you something; three consecutive readings trending downward tells you your protocol is working. A single ALT elevation might be noise; rising ALT over six months warrants action.
When reviewing your blood work on GLP-1:
- Celebrate the wins: Improved A1C, lipids, and glucose control are huge victories. Most GLP-1 users see dramatic improvements here.
- Address deficiencies early: Low B12, vitamin D, or iron? Don't wait for symptoms. Supplement now.
- Monitor liver/kidney trends: A single elevated ALT isn't concerning, but a rising trend is. Work with your doctor to understand cause and response.
- Adjust nutrition based on data: If your iron is low, eat more iron-rich foods or supplement. If your triglycerides are still high despite weight loss, consider reducing processed carbs.
How EverStrong Simplifies Blood Work Tracking
Managing 17 biomarkers across multiple test dates is complex. That's where EverStrong comes in. Upload your blood work results or enter your values manually, and our AI-powered system automatically:
- Tracks trends across your test history
- Flags improvements and concerns so you know what to celebrate and what to address
- Connects blood work to nutrition — understand which dietary changes are actually moving your markers
- Provides personalized insights tailored to your GLP-1 medication and health profile
Rather than storing PDFs or scribbling in a spreadsheet, you get a living, evolving picture of your metabolic health that informs every nutrition decision you make.
Track Your Blood Work with EverStrong
Upload your results or enter 17 key biomarkers. Track trends and get AI-powered insights.
Start Tracking FreeFinal Thoughts
GLP-1 medications are powerful tools for metabolic transformation. Blood work is your feedback mechanism—your data-driven compass pointing toward optimization. By monitoring these 17 biomarkers consistently, you're not just seeing results; you're understanding exactly how your body is changing and making adjustments in real time.
Your health is too important to guess about. Get tested, track trends, and let the data guide your GLP-1 journey.