What Tests Are Required Before Starting GLP-1?

Pepwise

12 min read•Jul 24, 2026

Before starting GLP-1 treatment, a doctor will usually review your medical history, current medicines, weight-related health factors, blood pressure, and relevant blood tests. The exact tests can vary depending on your age, symptoms, medical history, risk factors, and the type of GLP-1 medicine being discussed.

For many women, the most common preparation includes a consultation, baseline measurements, and blood work to check areas such as blood glucose, cholesterol, kidney function, liver function, and other health markers your doctor thinks are relevant. These checks help your clinician decide whether GLP-1 treatment is appropriate to discuss, what risks need to be considered, and what follow-up may be needed.

If you are still learning where GLP-1s fit within broader weight-management care, you may find it helpful to start with the broader GLP-1 weight loss pathway guide.

Not sure where to start? take the Pepwise Quiz to find your education pathway.

Importance of Pre-Treatment Tests

Pre-treatment tests are not about making the process more complicated. They help your doctor understand your current health picture before discussing whether GLP-1 treatment is suitable for you.

A GLP-1 consultation usually looks at more than weight alone. Your doctor may want to understand:

your medical history
your current medicines and supplements
whether you have diabetes, prediabetes, high blood pressure, high cholesterol, kidney issues, liver concerns, gallbladder history, or digestive conditions
your family history, where relevant
your previous weight-management attempts
pregnancy, breastfeeding, or plans for pregnancy
any symptoms that need assessment before treatment decisions are made

This matters because GLP-1 medicines are not suitable for everyone, and they are not a stand-alone answer to weight management. A proper review helps identify whether extra caution, further testing, or a different pathway may be needed.

Tests also create a baseline. If you and your doctor decide to proceed with a medical pathway, baseline results can help track changes over time and spot issues that need follow-up.

Common Medical Exams for GLP-1

Medical exams before starting GLP-1 are usually straightforward. They are often part of a general health assessment rather than a complex specialist process.

Your doctor may check:

Blood pressure: High blood pressure is common in people seeking weight-management care. Knowing your baseline helps guide safe monitoring and broader cardiovascular risk assessment.
Weight and body measurements: Your doctor may record weight, height, BMI, and sometimes waist measurement. These measurements help assess health risk and track progress, but they should not be treated as the only marker of health.
Heart rate and general physical observations: Depending on your history, your doctor may check basic signs that give context to your overall health.
Medication review: This is especially relevant if you take medicines for diabetes, blood pressure, mental health, hormones, pain, or other long-term conditions. Some combinations need careful monitoring.
Digestive and abdominal history: Doctors may ask about reflux, nausea, constipation, gallbladder issues, pancreatitis history, or previous abdominal surgery.
Pregnancy and reproductive health questions: For women of reproductive age, your doctor may ask about contraception, pregnancy plans, breastfeeding, or recent pregnancy, as these can affect treatment decisions.
Mental health and eating behaviour history: This may include questions about binge eating, restrictive eating, mood, stress, sleep, and previous weight-loss experiences. These questions should be asked respectfully and are part of understanding the full picture.

These medical exams before starting GLP-1 help your clinician decide what blood tests are useful and whether anything needs attention before moving further.

Is a Blood Test Needed?

In many cases, yes — a blood test is commonly requested before GLP-1 treatment is considered. The exact blood work depends on your health history and your doctor’s clinical judgement.

Common blood tests may include:

Blood glucose or HbA1c: These help assess blood sugar patterns and whether diabetes or prediabetes is present.
Cholesterol and triglycerides: These results help assess cardiovascular risk and may guide broader weight-management planning.
Kidney function tests: These check how your kidneys are working, which can matter when assessing overall safety and medication planning.
Liver function tests: These can help identify liver-related issues that may need monitoring or further assessment.
Electrolytes: These may be checked as part of a general metabolic panel, especially if you have other health conditions or take certain medicines.
Thyroid tests: These are not always required for everyone, but your doctor may request them if symptoms, history, or weight changes suggest they are relevant.
Pregnancy test: This may be requested where clinically appropriate.

Your doctor may also request additional tests if you have symptoms, a complex medical history, or previous abnormal results.

A useful way to think about blood tests is this: they are not simply a “pass or fail” step. They give your doctor information to help personalise the discussion, explain risks, and decide whether other health issues should be managed first.

You can also use the Pepwise Calculator to explore published clinical research outcomes if you want to explore published clinical research outcomes and timelines in a research-based way while you are learning about GLP-1 pathways.

Understanding Blood Work Results

Blood test results can feel confusing, especially when you are handed numbers, abbreviations, and reference ranges without much explanation. It is best to review results with a qualified health professional rather than trying to interpret them alone.

Your doctor may explain:

whether each result is within the expected reference range
whether a result is only slightly outside range or needs urgent follow-up
whether the result changes your treatment options
whether another test is needed to confirm the finding
how the result fits with your symptoms, medical history, and medicines

For example, an HbA1c result may help your doctor understand your average blood sugar pattern. Cholesterol results may guide a discussion about heart health risk. Kidney and liver function results may help determine whether extra monitoring or further investigation is needed before any medication decision.

If a result is abnormal, it does not automatically mean GLP-1 treatment is ruled out. It may mean your doctor needs more information, wants to stabilise another condition first, or recommends a different pathway. The key is to ask what the result means for you specifically.

How to Talk to Your Doctor About Tests

A good consultation is a two-way conversation. You do not need to know every medical term before you attend, but it helps to arrive with clear questions and accurate information.

Before your appointment, consider bringing:

a list of current medicines, including supplements and over-the-counter products
previous blood test results, if you have them
details of any past weight-management treatments or programs
your medical history, including gallbladder, pancreas, thyroid, kidney, liver, digestive, or mental health conditions
family history that may be relevant
notes about symptoms such as nausea, reflux, constipation, fatigue, menstrual changes, sleep issues, or appetite changes
questions about risks, monitoring, costs, follow-up, and alternatives

Helpful questions to ask include:

“What tests do you recommend before deciding whether GLP-1 treatment is appropriate?”
“Is a blood test needed before GLP-1 in my situation?”
“What are you checking for in these results?”
“Are any of my current medicines relevant to this decision?”
“Do any of my medical conditions change the risks?”
“How often would follow-up or monitoring be needed?”
“What should I do if the results show something outside the normal range?”
“Are there non-medication steps I should focus on first or alongside treatment?”

If your consultation is online, preparation still matters. You may want to read about what to expect from a GLP-1 consultation online so you know what information is usually discussed.

Related Guides and Resources

If you are preparing for a medical appointment, these related guides can help you feel more organised and less overwhelmed:

FAQs About GLP-1 Preparation

What medical conditions are checked before GLP-1?

Doctors commonly check for conditions that could affect safety, suitability, monitoring, or treatment choice. These may include diabetes or prediabetes, high blood pressure, high cholesterol, kidney disease, liver concerns, gallbladder disease, pancreatitis history, thyroid-related concerns, significant digestive conditions, pregnancy or breastfeeding status, and relevant mental health or eating behaviour history.

Your doctor may also review family history and current medicines. The exact checks depend on your personal situation.

How long do the tests take?

The appointment itself may be short, but the full process depends on where you have the tests done and how quickly results are returned. Blood collection often takes only a few minutes, while results may take anywhere from the same day to several days depending on the tests, clinic, and pathology provider.

Your doctor will usually let you know whether you need to fast, whether any medicines should be discussed before testing, and when to book a follow-up to review the results.

Conclusion

Tests before GLP-1 treatment are there to support a safer, more personalised medical discussion. They help your doctor understand your baseline health, identify risk factors, review medicines, and decide what next steps are appropriate.

If you are feeling unsure, start with the basics: ask which tests are needed, why they are being requested, what the results mean, and how they affect your choices. You do not need to rush the process. A calm, well-prepared conversation with a qualified health professional is often the most useful next step.

When you are ready, browse our research-only catalogue.