Blood Work Guide for GLP-1 Users: 17 Key Biomarkers to Track

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 optimise 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 optimise 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.

The 17 Key Biomarkers to Track

One thing before the list. We do not print target numbers, and you should be careful with anyone who does. Every lab prints its own reference range next to your result, ranges differ between labs and between countries, and a number that is fine for one person is worth investigating in another. What follows is what each marker tells you and which direction is usually good news on a GLP-1. Your doctor reads the numbers.

Metabolic Panel (5 markers)

1. Fasting Glucose: The foundation of metabolic health. Your lab report prints the reference range beside the result. On GLP-1, you should see notable improvements here, particularly if you're pre-diabetic or diabetic.

2. Haemoglobin A1C (HbA1C): Your 3-month average blood sugar, and the key metric for diabetes management. Your report will show where you sit against the non-diabetic range. GLP-1 users often see it fall over the first few months.

3. Fasting Insulin: Reveals how hard your pancreas is working. Lower is generally better. GLP-1 improves insulin sensitivity, so expect meaningful decreases.

4. Total Cholesterol: Watch the trend more than any single reading. Rapid weight loss can temporarily raise cholesterol; it usually settles.

5. LDL Cholesterol, "Bad" cholesterol. The target your doctor uses depends on your cardiovascular risk, which is why there is no single number here. Weight loss typically improves it.

Lipid & Cardiovascular Panel (3 markers)

6. HDL Cholesterol, "Good" cholesterol. Higher is better, and the reference range differs for men and women. GLP-1 users often see meaningful increases.

7. Triglycerides: Another cardio risk factor. Expect substantial improvements with GLP-1 and weight loss.

8. Triglyceride-to-HDL Ratio: A powerful indicator of metabolic health, and one your doctor can work out from the two results above. It often improves dramatically on GLP-1.

Liver Function (2 markers)

9. AST (Aspartate Aminotransferase): Enzyme indicating liver stress. Rapid weight loss can temporarily raise liver enzymes as fatty liver mobilises, so read it against your own baseline and the lab's range.

10. ALT (Alanine Aminotransferase): Another liver enzyme, more specific to the liver than AST. Worth watching closely if you carry extra weight, as fatty liver disease is common.

Kidney Function (2 markers)

11. Creatinine: Indicates kidney function. An important baseline for GLP-1 users, as some studies suggest monitoring, though kidney problems are rare.

12. eGFR (Estimated Glomerular Filtration Rate): A better indicator of kidney health than creatinine alone. Your doctor calculates this one and interprets it.

Thyroid Function (2 markers)

13. TSH (Thyroid Stimulating Hormone): Controls thyroid function. Worth monitoring if you have any thyroid history. Note that a biotin supplement can distort this result, so tell whoever orders the test.

14. Free T4: Thyroid hormone that directly affects metabolism. Read alongside TSH so your doctor can see whether your thyroid is staying stable.

Vitamins & Minerals (3 markers)

15. Vitamin B12: Critical for energy and nerve function. Rapid weight loss and reduced food intake can deplete it. If yours is low, what to do about it is a conversation with your doctor or pharmacist.

16. Vitamin D: Essential for bone health, immunity and metabolism. Many GLP-1 users come back low. Whether you need a supplement, and how much, is your doctor's call.

17. Iron (Ferritin & Serum Iron): Oxygen transport and energy. Low iron can cause fatigue on GLP-1, so it is worth watching if your red meat intake has dropped. Iron supplements are not a do-it-yourself decision; ask your GP.

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 the EverStrong tracker 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 personalised 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.

Final Thoughts

GLP-1 medications are powerful tools for metabolic transformation. Blood work is your feedback mechanism, your data-driven compass pointing toward optimisation. 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.

Nutrition and strength coaching, not medical advice. Talk to your prescribing doctor before changing anything about your medication.