Metabolism

Metabolism Tests show how your body turns food into energy and how well key systems—glucose control, fats, thyroid, liver, and electrolytes—are working. Many metabolic problems develop quietly and first appear as abnormal labs before symptoms. Proactive testing can reveal insulin resistance, unhealthy lipid patterns, low-grade inflammation, or thyroid shifts that affect weight, energy, and long-term heart risk.

A practical starting point is A1c/fasting glucosefasting insulin, a lipid panel (with ApoB and Lp(a) for risk refinement), hs-CRP, and a comprehensive metabolic panel (CMP) for electrolytes, kidney, and liver function. Add thyroid tests (TSH ± free T4), ALT/AST/GGT for fatty-liver risk, vitamin D, and uric acid when indicated. These tests support screeningdiagnostic triage, and monitoring but do not replace a clinician’s evaluation or individualized care.

Signs, Symptoms & Related Situations

  • Energy & weight: fatigue, low stamina, central weight gain, difficulty losing weight

  • Glucose cues: frequent thirst/urination, cravings, mid-afternoon slumps

  • Lipid/heart clues: family history of early heart disease, high triglycerides, low HDL

  • Thyroid hints: cold intolerance, hair thinning, constipation, palpitations

  • Liver/metabolic: elevated ALT on prior labs, waist circumference above goal

  • Lifestyle/meds: sedentary time, sleep apnea risk, alcohol use, long-term steroids or antipsychotics

  • Urgent care now: chest pain, severe shortness of breath, confusion, or signs of stroke

Symptoms and risks should be reviewed by a qualified clinician.

Why These Tests Matter

What testing can do

  • Quantify insulin resistance and glucose control (A1c, fasting glucose/insulin)

  • Refine cardiovascular risk beyond standard cholesterol (ApoB, Lp(a), triglycerides/HDL)

  • Flag fatty-liver and systemic inflammation (ALT/AST/GGT, hs-CRP)

  • Identify thyroid-related contributors to energy and weight (TSH ± free T4)

  • Track trends so you can see how changes in diet, activity, and sleep affect your numbers

What testing cannot do

  • Diagnose conditions without clinical context or replace a physical exam

  • Provide treatment or dosing advice

  • Predict outcomes with certainty—results guide risk, not destiny

What These Tests Measure (at a glance)

  • A1c • Fasting Glucose • Fasting Insulin: long- and short-term glucose control; many clinicians use these to estimate insulin resistance.

  • Lipid Panel: triglycerides, HDL-C, LDL-C; high triglycerides/low HDL often track with insulin resistance.

  • ApoB & Lp(a): risk-refining lipoprotein markers beyond standard cholesterol.

  • hs-CRP (steady state): systemic inflammation context (avoid testing during illness).

  • CMP: electrolytes (sodium, potassium, CO2), creatinine/eGFRBUNglucosealbuminAST/ALTbilirubin.

  • Liver fat signals: ALT, AST, GGT; persistent elevation can align with metabolic-associated fatty liver.

  • Thyroid: TSH ± free T4 (± free T3 when directed) for metabolic rate context.

  • Vitamin D (25-OH): bone/muscle and metabolic support.

  • Uric Acid: can rise in insulin resistance and metabolic syndrome.

  • Magnesium (± RBC Mg): muscle/nerve function; low levels may accompany poor metabolic control.

Quick Build Guide

Goal / Scenario Start with Add if needed
Wellness metabolic baseline A1c • Fasting glucose • Lipid panel • CMP • hs-CRP ApoB • Lp(a) • Vitamin D
Insulin resistance check A1c • Fasting glucose • Fasting insulin Lipid panel • ALT/AST • Magnesium
Heart-risk refinement Lipid panel • hs-CRP ApoB • Lp(a)
Fatty-liver suspicion (elevated ALT/GGT) CMP (ALT/AST/GGT) • A1c • Lipids Ferritin • Hepatitis screens(clinician-directed)
Thyroid-type symptoms TSH Free T4 (± Free T3)
Weight plateau review A1c • Fasting insulin • Lipids • CMP Thyroid • Vitamin D • Uric acid

How the Testing Process Works

  1. Pick your starting set: use the Quick Build Guide to match tests to your goals.

  2. Prepare for accuracy: fast 8–12 hours if your order includes fasting glucose/insulin or lipids; avoid strenuous exercise and heavy alcohol the day before.

  3. Provide samples: standard blood draw.

  4. Get secure results: most panels post within a few days.

  5. Plan next steps: review with your clinician; adjust nutrition, activity, sleep, and monitoring cadence.

Interpreting Results (General Guidance)

  • A1c or fasting insulin high: supports insulin resistance; track trends after lifestyle changes.

  • Triglycerides down / HDL up: often favorable; ApoB best reflects atherogenic particle burden.

  • ALT/AST or GGT elevated: consider metabolic-associated fatty liver risk; confirm persistence and context.

  • hs-CRP elevated (outside illness): suggests higher inflammatory tone; interpret with other risk markers.

  • TSH outside range: thyroid imbalance can affect energy, weight, and lipids.
    Always interpret results with a qualified healthcare professional; patterns over time matter more than any single number.

Choosing Panels vs. Individual Tests

  • Core metabolism panel: A1c • Fasting glucose • Fasting insulin • Lipid panel • hs-CRP • CMP

  • Risk-refining add-ons: ApoB • Lp(a)

  • Organ-specific add-ons: ALT/AST/GGT • Vitamin D • TSH ± Free T4 • Uric acid • Magnesium
    Choose bundled panels for efficient screening; add individual markers to answer targeted questions and monitor progress.

FAQs

Do I need to fast?
Yes if your panel includes fasting glucose/insulin or lipids; otherwise fasting is usually not required.

What’s the best test for insulin resistance?
There isn’t just one. Many clinicians use A1cfasting glucose, and fasting insulin together and follow trends.

Are ApoB and Lp(a) necessary?
They refine risk beyond standard cholesterol, especially with family history or borderline results.

Can abnormal ALT mean fatty liver?
Persistently high ALT (± GGT) can align with metabolic-associated fatty liver, but imaging/clinical review confirms.

How often should I recheck?
Commonly every 3–6 months when making changes; your clinician will set the interval.

Will supplements change my labs?
They can. List all supplements and medicines on your order to aid interpretation.

Related Categories & Key Tests

  • Nutrition & Wellness Tests Hub

  • Metabolic Syndrome • Diabetes Health • Cholesterol Tests • Dietary Fatty Acids Tests • Diet Tests • All Vitamin & Mineral Deficiency Tests • Liver Health Tests

  • Key Tests: A1c • Fasting Glucose • Fasting Insulin • Lipid Panel • ApoB • Lp(a) • hs-CRP • CMP (electrolytes, creatinine/eGFR, BUN, AST/ALT, bilirubin, albumin) • ALT/AST/GGT • TSH ± Free T4 • Vitamin D (25-OH) • Uric Acid • Magnesium (± RBC)

References

  • American Diabetes Association — Standards of Care in Diabetes.
  • American College of Cardiology/American Heart Association — Cholesterol guideline and risk assessment.
  • AASLD/EASL — Guidance on metabolic-associated fatty liver disease evaluation.
  • American Thyroid Association — Thyroid function testing guidance.
  • Academy of Nutrition and Dietetics — Lifestyle and medical nutrition therapy for metabolic health.
  • Clinical reviews on ApoB/Lp(a), hs-CRP, and insulin resistance assessment.

Available Tests & Panels

Your Metabolism Tests menu is pre-populated in the Ulta Lab Tests system. Start with a core metabolism panel and use filters to add ApoB, Lp(a)ALT/AST/GGTthyroidvitamin Duric acid, or magnesium based on your goals. Follow any fasting instructions and review results with your clinician to tailor your plan and set a monitoring schedule.

 

The Differences Between Fast Metabolism and Slow Metabolism Tests

If you've got a metabolism that you just can't figure out, we understand. Everyone's metabolism is different. Plus, your metabolism can change over time and often does. You've probably noticed that you gain weight easier now that you're older than you did when you were in your teens, and this is completely normal. In fact, this is typical for many people. However, if you're a younger person and gain weight easily, there's no need to fret, as that's also common.

You've probably heard that people with a fast metabolism can eat anything and get away with it -- but why is this? How does a person's metabolism work? What is metabolism testing? We know you probably have a lot of questions, so without any further ado let's dive in. 

Fast Metabolism Vs. Slow Metabolism

Metabolism is a term that's thrown around quite a bit, but for all intents and purposes, it describes the internal process of how your body uses energy and gets rid of calories. This includes blood circulating through the body, breathing, and your organs functioning. A person with a fast metabolism might have a body with more muscle mass that uses more energy to perform everyday tasks than someone with a slow metabolism, meaning they need to consume more calories to keep everything stable. Think of a fast metabolism as a gas-guzzling pickup truck and a slow metabolism as a fuel-efficient smart car -- the pickup truck needs more fuel to function!

Someone with a fast metabolism burns calories faster naturally, while someone with a slow metabolism burns them more slowly. However, most people have average metabolisms, meaning they align with the 2,000 calorie diet which is recommended for most people. 

What this means is two people with different metabolisms who eat the same amount of food will absorb calories differently. A young, busy athlete might need to eat twice as much as someone ten years older who lives a sedentary lifestyle to maintain the same amount of weight as them. However, age plays a key role in how your metabolism functions. Typically speaking, the older you get, the more your metabolism slows down. 

What Determines the Kind of Metabolism You Have? 

This news might be disappointing, but your metabolism is mostly influenced by genetics. Since you can't do much to change your DNA, there's no real way to alter how your metabolism functions. However, diet and exercise play huge roles in how your body absorbs nutrients and converts food into energy, so knowing what kind of metabolism you have can make it much easier to achieve your ideal weight or maintain a healthy lifestyle -- regardless of the metabolism you were born with. 

How Can You Find Out What Kind of Metabolism You Have?

If you find yourself full after smaller meals or don't seem to need to eat that much to live a normal life, then you might have a slow metabolism. The same is true if you don't feel like you eat that much but still struggle with weight gain or find it difficult to lose weight. However, it would be best to consider how much exercise you get and examine the amount of calories you're taking in on average. You might not need that much fuel because you don't use that much energy on a regular basis. However, if you're constantly hungry and can snack all day and never seem to gain any weight, then you probably have a faster metabolism. 

Metabolism tests are, without a doubt, the easiest way to know for sure what kind of metabolism you're working with. While it's fairly obvious for most people, sometimes other factors get in the way and make it difficult to know for sure. Factors that can affect how your metabolism functions include the kind of food you're eating, the amount of activity you perform every day, and any illnesses or medical conditions you might have. Metabolism tests can set your mind at ease and confirm whether you have a fast metabolism or a slow one. 

What Kinds of Metabolic Testing Is There? 

Lab Tests

While home tests might seem to be a convenient option when it comes to conducting any sort of test, this isn't really the case. They come with a list of problems. First and foremost, they are not entirely reliable. The samples are not collected by trained technicians in an appropriate environment. It's very easy for at-home tests to show incorrect results. Second, those tests are not generally accepted by doctors and hospitals. If you were to show those results to your doctor, they would most likely recommend that you repeat the testing with a blood draw at a national lab. Third, only a limited number of tests are available that restrict the insight into your health.

Our comprehensive metabolic testing solution does not suffer from any of these problems. All of our tests are considered highly accurate and reliable. They are also accepted by all doctors and health organizations, unlike at-home tests. Why? Because the samples are gathered and tested in the same way as doctors expect them to be. All samples are handled by certified professionals in a certified institution. All of those certifications help guarantee quality and accuracy.

Metabolic Discovery Panel - It contains 8 tests with 68 biomarkers. This comprehensive set of tests helps assess your metabolism. Are you storing too much fat and sugar or perhaps too little? Are you insulin resistant with subsequent inflammation? You can run this panel to discover whether your diet, fitness, and nutritional habits are providing you the metabolic health and longevity you deserve. Don't settle for one-size-fits-all health advice. Your diet, fitness lifestyle, and nutritional intake should improve your energy, weight, and inner metabolic health. But don't merely trust it's working. Run this Metabolic Discovery panel quarterly to take a snapshot of your insulin response, blood sugars, and lipids and adjust your lifestyle based upon your results.

  • CBC (includes Differential and Platelets)
  • Comprehensive Metabolic Panel (CMP) includes fasting Glucose
  • Ferritin
  • Hemoglobin A1c
  • Insulin
  • Lipid Panel with Ratios
  • Vitamin B12 (Cobalamin)
  • Vitamin D, 25-Hydroxy, Total, Immunoassay

The Metabolic Discovery Comprehensive Panel - It contains 15 tests with 78 biomarkers and all of the tests in the Metabolic Discovery Panel, plus:

  • Adiponectin
  • Iron and Total Iron Binding Capacity (TIBC)
  • Leptin
  • T3, Free
  • T4, Free
  • TSH

Metabolism Lab Panel - it contains 6 tests with 27 biomarkers.

  • Fasting Insulin
  • Glucose (In CMP)
  • Hemoglobin A1c
  • TSH
  • Free T3
  • Free T4
  • Comprehensive Metabolic Panel (CMP)

RMR Testing

There are various methods used to test what kind of metabolism a person has. These include determining a person's resting metabolic rate, or RMR. This refers to how many calories your body burns while at rest. Someone with a faster metabolism will burn more calories while doing nothing at all. 

VO2 Max Testing

Another kind of metabolic testing measures your maximum volume of oxygen, or VO2 Max, which refers to how your body utilizes oxygen while exercising. An athletic person will have a higher VO2 max and therefore have a higher capacity for high-intensity exercise, while someone who doesn't exercise all that much won't use oxygen as effectively. 

Lactate Threshold Testing

When your muscles become fatigued, this is due to a buildup of lactic acid, which your body makes when it can't use oxygen to produce energy. Usually, a buildup occurs during exercise. While your body naturally eliminates lactic acid, when exercising you will eventually reach a point where your body is making too much to be eliminated, causing you to become tired and your muscles to feel strained, stiff, and tired. Your lactate threshold refers to when your body is producing lactic acid in the blood faster than it can eliminate it. 

How Do I Test My Metabolism? 

Ulta Lab Tests offers highly accurate and reliable tests so you can make informed decisions about your health.

  • Secure and confidential results
  • No insurance referral is needed
  • Affordable pricing
  • 100% satisfaction guarantee

Order your metabolism lab tests today, and your results will be provided to you securely and confidentially online in 24 to 48 hours for most tests.

Take control of your health today with Ulta Lab Tests.