GLP-1, Ozempic, and medical weight loss: what can you have tested?

What are GLP-1 medications?

GLP-1 stands for glucagon-like peptide-1, a hormone the body produces itself after a meal. It suppresses appetite, slows gastric emptying and stimulates the release of insulin. As a result, you feel full sooner and for longer.

GLP-1 medications are medicines that mimic this hormone. The best-known active substance is semaglutide, familiar to the general public mainly under the brand name Ozempic. Several medications exist in this group; the names differ, the principle is similar.

These medications were originally developed for the treatment of type 2 diabetes. Weight loss turned out to be an important effect, and medications from this group are now also used for weight management. Always on prescription, and always under the supervision of a doctor.

Why these medications belong with a treating doctor

GLP-1 medications are prescription medicines. They can cause side effects and are not suitable for everyone. Whether such a medication is appropriate in your situation can only be judged by a doctor who knows your medical history, your health and your medication use. That same doctor monitors the course of treatment and adjusts it where needed.

That is why you will not read any advice for or against this medication here. Bloodworks does not treat and does not prescribe medication. What we do offer: insight into your blood values, reviewed by BIG-registered doctors. You can share that insight with the doctor supervising your programme.

Why blood testing around a weight loss programme can be worthwhile

Those who seriously set out to lose weight often change many things at once: eating differently, moving more, sometimes medication through their treating doctor. Without a starting point, it is hard to say afterwards what all that effort has meant for your body. A measurement before you start records that starting point.

The blood values that most often give insight around a weight loss programme:

• HbA1c and glucose: the baseline of your blood sugar
• cholesterol and triglycerides: your cardiovascular risk profile
• liver and kidney values: baseline values that matter especially when you use medication, with interpretation by a doctor
• TSH: an underactive thyroid can influence weight

If you measure again later, it becomes visible whether the changes are heading in the right direction. That makes the conversation with your doctor more concrete: not talking about a feeling, but about a comparison between two measurements.

Blood sugar: HbA1c and glucose

Excess weight and blood sugar are closely linked. Fasting glucose shows the snapshot; HbA1c summarises your average blood sugar over the past two to three months. Together they provide a reliable baseline of your sugar metabolism.

Blood sugar on the high side can fit a disturbed sugar metabolism; that is information your doctor can work with. And because diet, exercise and weight loss influence blood sugar, a starting picture is particularly valuable here: at a repeat measurement you can see whether anything is changing.

Cholesterol and triglycerides: the cardiovascular risk profile

Excess weight often goes hand in hand with shifted blood lipid values. Cholesterol, with its breakdown into HDL and LDL, and triglycerides together give a picture of your cardiovascular risk profile. For some tests it matters whether you are fasted; when you order, you receive clear instructions per test.

A weight loss programme can influence these values. Here too: the result is a description of where you stand. What a value means in your situation, and whether follow-up steps are needed, is for a doctor to assess.

Liver, kidneys and thyroid

Liver and kidney values say something about how these organs are functioning. Those who use medication, or are discussing it with a doctor, benefit from baseline values: your treating doctor can compare later measurements against them. The interpretation of these values belongs emphatically with a doctor; an abnormal result often has an innocent explanation, but that judgement is not yours to make.

TSH is the hormone that controls the thyroid. An underactive thyroid can cause weight gain and make losing weight more difficult. If weight loss does not succeed despite serious effort, a TSH measurement can be relevant.

Lifestyle remains the foundation

No medication replaces the foundation: diet, exercise, sleep and a liveable balance between effort and recovery. Even in programmes where a doctor prescribes medication, lifestyle remains the foundation; medication is then an addition that doctor and patient weigh together.

Blood testing fits both routes. It shows where you stand and what your efforts are delivering, with or without medication. That insight is also motivating: progress you do not yet see on the scales can already be visible in your blood values.

What a result does and does not tell you

A blood test describes a snapshot: where your values stand right now. That is valuable as a starting point and as a comparison at a repeat measurement. What a result does not do: make a diagnosis, or say whether medication is suitable or safe in your situation. That assessment is made by your treating doctor, based on the complete picture.

If you are considering a weight loss programme, or are already in the middle of one, blood testing gives you and your treating doctor a clear starting point. Without a referral, with a personal doctor interpretation and a clear PDF report.

The choice for or against medication remains with you and your treating doctor. What you can arrange yourself is insight: knowing where you stand before you begin, and seeing what changes along the way.