What blood tests do I need before a weight loss drug?

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Most clinicians want a baseline set of labs before starting a weight loss medication, both to confirm you are a good candidate and to catch anything the medication could complicate. The usual panel includes blood sugar - glucose and often A1c - because many candidates have prediabetes or diabetes, and drugs like semaglutide affect blood sugar. A comprehensive metabolic panel checks kidney and liver function, which matters for how drugs are processed and rules out other problems.

Depending on your history, the clinician may add a lipid panel, since cholesterol and triglycerides often improve with weight loss, and a thyroid test, since an underactive thyroid can drive weight gain and would be treated differently. If there is any chance of pregnancy, a pregnancy test is standard, because these medications are not used during pregnancy.

The drug label drives some of this too. The Ozempic label, for example, warns about pancreatitis, gallbladder problems, and kidney injury from dehydration, so a clinician wants to know your baseline before starting. If you had blood work done in the last few months, bring it - many programs accept recent results instead of ordering a fresh draw, which saves you a lab fee and gets you started sooner.

Pymander is a free AI doctor, 24/7 by text. It cannot order labs, but it can explain what each test measures, why it matters for a specific medication, and how to read your results when they come back.

What blood tests do I need before a weight loss drug?

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