Labs Required for GLP-1 Treatment: CMP, HbA1c, and TSH

You have researched GLP-1 medications and understand how they work. You may be wondering what comes before the prescription: the lab work. Why does a telehealth provider order blood tests before writing a prescription? What do those tests show? And do you have to pay for them separately?

This page walks through the baseline labs required before you start treatment, the ongoing monitoring that happens during your program, and how Transformation Health includes all lab work at no extra charge.

Why Lab Work Is Required Before Starting GLP-1

GLP-1 medications are prescribed medications that require medical supervision. They are not over-the-counter supplements. Before your provider prescribes, they need clinical information to answer two critical questions:

Is this medication medically appropriate for you? GLP-1 medications work on appetite signaling and how your body processes glucose. They have specific contraindications. For example, GLP-1 medications carry a label warning about thyroid cancer risk^[1] and are contraindicated for patients with a personal or family history of medullary thyroid carcinoma (MTC) or MEN2. Lab work screens for conditions that would make prescribing unsafe.

What is your baseline health status? Lab work establishes your kidney function, liver function, blood sugar control, and thyroid status before you start medication.^[1] This baseline matters because GLP-1 medications can affect these systems. If your kidney function is already impaired, your provider may adjust dosing or decide against prescribing. If your blood sugar is very high, that changes the clinical context. Lab work also gives your provider something to compare to during treatment. When you come back in 3 months, new labs show whether treatment is working and whether any metabolic changes need attention.

Pre-Treatment Labs (Baseline Panel)

Before starting GLP-1 treatment, you will have blood drawn and a urinalysis collected. The standard baseline panel includes:

Additional Lab Sometimes Ordered

Some providers also check ferritin (iron storage levels). Ferritin is relevant because iron plays a role in hair health, and hair loss is a possible side effect of weight loss during GLP-1 treatment. If your ferritin is low, your provider may recommend supplementation during treatment.

Why HbA1c Is Particularly Important

Your HbA1c result has special significance for GLP-1 treatment. Here is what the numbers mean:

HbA1c below 5.7% = Normal glucose metabolism. You do not have diabetes or prediabetes. GLP-1 treatment will still help reduce appetite and support weight loss, but the clinical context is different than it is for someone with elevated blood sugar.

HbA1c 5.7% to 6.4% = Prediabetes. Your fasting glucose is higher than normal, and your average glucose over the past 3 months shows a trend toward diabetes. GLP-1 medications are extremely effective in this range because they address the underlying glucose dysregulation. Your provider will likely include glucose management in your treatment goals alongside weight loss.

HbA1c 6.5% or higher = Type 2 diabetes. You meet the clinical criteria for diabetes diagnosis. This does not disqualify you from treatment. In fact, GLP-1 medications are approved by the FDA for type 2 diabetes management. Your provider will frame treatment as both weight loss support and diabetes management. The clinical monitoring during your program may include additional glucose checks.

The key point: your HbA1c does not determine whether you qualify for treatment. It informs your provider’s clinical assessment and helps them set realistic expectations for what you will experience.

Ongoing Monitoring Labs

Lab work does not stop after your baseline. During GLP-1 treatment, periodic lab monitoring ensures your kidneys, liver, and blood sugar continue to respond well to the medication.

The frequency and specific tests your provider orders may vary based on your individual health history. For example, if you have diabetes, your provider may want to check glucose more frequently.^[2] If your baseline kidney function was slightly low, you may need CMP checks at every visit. These adjustments are standard clinical practice and are factored into your ongoing care.

How Transformation Health Handles Labs

Lab work is one of the biggest hidden costs in telehealth weight loss programs. Some companies advertise a low monthly fee, then charge separately for lab draws, lab processing, provider consultation, and shipping. Transformation Health does not work that way.

Labs are included at no additional cost. Your monthly fee covers medication, provider care, coaching, and required lab work. You do not receive a separate bill from the lab network.

Labs are drawn at Quest Diagnostics or Labcorp. Both companies have thousands of locations nationwide and are available in most cities, suburbs, and many rural areas. You could walk into a Quest or Labcorp location and have your blood drawn. Your provider’s order will be in the system.

You do not need insurance. Many telehealth weight loss programs require insurance to cover lab costs. Transformation Health’s program covers lab work regardless of whether you have insurance. If you have insurance, your lab results may be reported to your insurer for informational purposes (depending on state law), but your program fee is all-inclusive, and you are not billed separately.

Your provider reviews the results and determines next steps. Within 3-5 business days of your lab draw, results are typically available in the online portal. Your provider reviews them and will reach out if any results require discussion or if treatment needs adjustment.

What Happens If Lab Results Show Something Abnormal

Lab results sometimes flag abnormalities. This does not automatically mean you cannot receive treatment. Here is how your provider handles common findings:

If your kidney function is significantly impaired (eGFR below 30 or severe creatinine elevation): Your provider may determine that GLP-1 medication is not safe for you.^[1] Kidney function is critical because the medication is partially cleared through the kidneys. Severe kidney disease makes prescribing risky. This is an absolute contraindication in most cases.

If your liver enzymes are elevated: Your provider assesses the degree of elevation and the cause. Some elevation is from fatty liver disease (common in people with metabolic syndrome). Mild elevation may not prevent treatment. Severe elevation or signs of liver disease may contraindicate prescribing. Your provider will discuss this with you.

If your HbA1c is very high (above 10%) or your fasting glucose is severely elevated: This indicates poorly controlled diabetes. Your provider will not automatically say no. Instead, they will explain that your body is in a metabolic crisis and that GLP-1 medication is appropriate. However, you may require closer glucose monitoring during initial treatment, and your provider may refer you to an endocrinologist or diabetologist if your case is complex.

If your TSH is elevated (hypothyroidism): This does not disqualify you. Hypothyroidism is actually one reason GLP-1 treatment can be helpful (because it addresses weight resistance caused by low thyroid). Your provider will likely recommend that you see your primary care provider about thyroid management while you are on the GLP-1 program. Thyroid medication and GLP-1 medication can be used together safely.

If your ferritin is low (iron deficiency): Your provider will likely recommend iron supplementation to reduce the risk of hair loss during weight loss treatment.

The independent, licensed provider makes the final clinical determination. They will explain any significant findings and discuss whether treatment is medically appropriate for you.

At-Home Labs vs. In-Person Draws

You may have seen ads for at-home blood draw kits. Transformation Health uses only Quest Diagnostics and Labcorp in-person draws, not at-home collection kits. Here is why:

In-person lab draws at established facilities (Quest, Labcorp) meet federal and state requirements for chain-of-custody, sample integrity, and medical-legal documentation. At-home kits, while convenient, do not meet the same regulatory standard for clinical decision-making. A provider ordering medication based on lab results assumes those results came from a certified lab with proper procedures.

Quest and Labcorp have thousands of locations nationwide, so you are likely within driving distance of one. In urban and suburban areas, there are usually multiple locations with extended hours and weekend availability. In rural areas, you can use the Quest or Labcorp location finder to identify the nearest facility. If you live in an extremely remote area, contact Transformation Health’s support team to discuss options.

Summary

GLP-1 treatment is a medical intervention, not a supplement. It requires baseline lab work to ensure safety, and ongoing monitoring to track your response. Transformation Health includes all required lab work at Quest Diagnostics or Labcorp at no additional cost, with no separate lab bills and no insurance requirement. Your provider reviews your baseline results before prescribing and orders periodic follow-up labs to monitor your health throughout treatment.

Citations

[1] U.S. Food and Drug Administration. “Prescribing Information for semaglutide for chronic weight management.” 2021. https://www.accessdata.fda.gov/drugsatfda_docs/label/2021/215256s000lbl.pdf

[2] American Diabetes Association. “Standards of Care in Diabetes.” Diabetes Care. 2024. https://diabetesjournals.org/care/article/47/Supplement_1/S295/153954