Lab tracking on GLP-1 medication: a complete guide

A common rhythm many clinicians follow: a full baseline panel before the first dose, the same panel around 3 months, again around 6 months, then every 6 to 12 months for as long as you stay on the medication. That cadence tends to capture the changes people care about and gives your prescriber data to work with.

A1C is often checked roughly quarterly during active dose titration, then twice a year on a stable dose. Lipids frequently follow the same cadence; both tend to respond in the early months, so the 3-month and 6-month values are usually the most informative.

Kidney and liver markers usually ride along on the metabolic panel, so they get checked whenever A1C does. If your eGFR has been borderline or your prescriber has flagged early kidney questions, more frequent creatinine checks during titration are not unusual. That is a decision for your clinician, not the app.

Thyroid is commonly once a year unless you have symptoms or a known thyroid history. People with autoimmune thyroid disease usually keep their endocrinologist's recommended cadence, GLP-1 or not.

Vitamin D and B12 are reasonable to check at baseline and again around 6 months in, especially if your appetite is low. A panel right before a dose increase is a useful checkpoint when your prescriber wants to confirm everything looks as expected.

This is a general pattern people describe, not a prescription. If you are on Ozempic for type 2 diabetes, your endocrinologist may want labs more often. If you are on Wegovy or Zepbound for weight management without diabetes, a couple of checkpoints a year is often enough. Always follow your own healthcare provider's guidance on what to test and when.

Knowing the typical direction of change can help you read your own results with more context. A few patterns come up often in published trials of semaglutide and tirzepatide and in the experiences people share on Wegovy, Mounjaro, and Zepbound. These are general patterns, not promises about your results.

A1C often eases down over the first several months. Drops of roughly 1.0 to 1.5 percentage points are commonly reported in trials of semaglutide and tirzepatide for type 2 diabetes, with larger drops at higher starting A1Cs. Without diabetes, A1C often settles lower within the normal range.

LDL and triglycerides commonly fall as weight comes off and food choices shift. Triglycerides can move quickly, especially from a high starting value. LDL tends to drop more gradually. HDL often moves more slowly, and a small dip during rapid fat loss is not unusual; the longer-term trend, particularly non-HDL and ApoB if you measure them, is what people watch.

Kidney function in type 2 diabetes often stays steady or improves once blood sugar is better controlled. Outside of diabetes, kidney markers usually stay steady. A short rise in creatinine during heavy nausea or low fluid intake is often dehydration rather than kidney damage, but anything that worries you is a question for your doctor.

Liver enzymes (ALT, AST) often ease in people with fatty liver as visceral fat shrinks. Sometimes ALT will tick up briefly during fast weight loss. A persistent elevation, or a sharp jump out of your baseline range, especially alongside new abdominal pain or yellowing of the skin or eyes, is worth a prompt conversation with your doctor.

Vitamin D often runs low if you are eating less, and B12 can dip after long appetite suppression. Hemoglobin and hematocrit usually stay stable. Thyroid markers typically do not change because of the medication itself, which is one reason an annual TSH is on many people's lists. Phaze can chart these values over time so you can see the trend, but it does not interpret them for you.

Manual lab entry is free in Phaze. Type a value, pick the unit, save. Phaze charts each value on its own trend line and can overlay your medication, so a dose change shows up next to the value change.

Lab document scan and OCR import is part of Phaze Pro. Snap your printed lab report or attach the PDF your lab emailed, and OCR helps pull out values, units, and reference ranges, including multi-page PDFs. Review the extracted values, fix anything that looks off, and save. Manual entry stays free either way.

Phaze organizes everything into 8 lab categories: GLP-1, Metabolic, Lipids, Vitamins, Kidney, Liver, Thyroid, and Inflammation. It is a tracking tool, not medical advice, so it surfaces your own numbers and trends rather than telling you what they mean. For a deeper look, see the Lab Tracker feature page.

Lab data is encrypted with AES-256-GCM and stored in the Apple Keychain on your device. Phaze is local-first, so nothing is uploaded to our servers by default; an optional iCloud backup is also encrypted. Your lab values are never sold and never used to train AI. In the app, Labs & Scans also includes Body Composition (Beta), so weight, body composition, and labs can live in one place.

Lab tracking is most useful when it sharpens the conversation with your prescribing clinician. A short list to bring to your next visit:

1. "Looking at my A1C, lipid, and kidney trends since starting this medication, what would you change about my plan?" That single question reframes the visit around the data instead of the symptom of the day.

2. "Are any of these results moving in a direction that concerns you?" Clinicians are good at noticing single out-of-range values; trends can be easy to miss in a short visit. Showing them the chart helps.

3. "What should I have tested at my next blood draw?" A consistent plan makes the cadence predictable and gives you a clear next checkpoint.

With Phaze Pro you can generate a shareable PDF report that brings your tracked trends to the visit. It is a wellness summary, not a medical document, and your clinician's guidance always comes first.