From energy and immunity to hormones and nutrition, with 140+ biomarkers, Limitless reveals the story behind your health. When you know yourself more, you can live more fully.
Limitless goes far beyond basic testing. Depending on your plan, you’ll unlock insights across dozens of categories.
A protein carried by “bad” cholesterol particles. High ApoB means more risk of plaque buildup in your arteries. Helps reveal hidden heart risk that standard cholesterol tests can miss.
The main protein in “good” cholesterol (HDL). Higher ApoA1 protects your arteries by helping clear fats from the blood. Think of ApoA1 as your heart’s ally.
Often called “bad cholesterol.” Elevated LDL can clog arteries and raise your risk of heart disease. Knowing your LDL helps you protect your arteries and heart.
The “good cholesterol” that sweeps away excess fats. Higher HDL lowers your heart risk. Think of HDL as your body’s natural cleaner.
The sum of all cholesterol types in your blood. High levels increase risk of heart problems. It’s the overall snapshot of cholesterol in your system.
A comparison of “bad” to “good” cholesterol. A higher ratio means more heart risk. A simple way to see your balance of risk and protection.
A type of fat stored in your blood. High levels raise the chance of heart attack and stroke. Triglycerides reflect how your body handles sugars and fats.
All the cholesterol linked to artery-clogging. It’s a stronger predictor of heart problems than total cholesterol alone. Think of it as your “everything bad” cholesterol number.
A genetic cholesterol particle that builds plaque. High Lp(a) increases risk for heart attack and stroke even with normal cholesterol. It’s your inherited heart risk marker.
A marker of inflammation in your body. High hs-CRP signals hidden irritation in your arteries. Think of it as your body’s “fire alarm” for inflammation.
An amino acid in your blood. High levels can damage blood vessels and raise heart risk. It’s an early warning sign for artery health.
The main sugar your body uses for energy. High fasting glucose can signal prediabetes or diabetes risk. It’s your body’s fuel gauge.
A measure of average blood sugar over the last 2–3 months. High HbA1c means higher risk of diabetes and long-term complications. It’s your “3-month blood sugar memory.”
The hormone that moves sugar from your blood into your cells. High fasting insulin can mean your body is becoming resistant. It’s your early warning sign for metabolic health.
The active form of insulin circulating in your blood. Abnormal levels may point to insulin resistance or pancreas strain. It shows how well your body is handling sugar.
A substance released alongside insulin. Measuring C-peptide shows how much insulin your body is producing. It’s like checking your pancreas’ output.
A calculation from glucose and insulin levels. High HOMA-IR means insulin resistance and higher diabetes risk. It’s a snapshot of how hard your body works to manage sugar.
Another measure of insulin sensitivity. A low score signals insulin resistance. It’s a quick math check of how responsive your body is to insulin.
A hormone linked to growth and metabolism. Abnormal IGF-1 may affect energy, muscle, and long-term health risks. It reflects how growth signals are balanced in your body.
A hormone from the brain that tells your thyroid how much hormone to make. Abnormal TSH can signal underactive or overactive thyroid. It’s the master switch for thyroid health.
One of the main thyroid hormones. Low or high T4 affects energy, weight, and mood. It’s your body’s “energy throttle.”
The active thyroid hormone that powers metabolism. Abnormal T3 can cause fatigue, weight changes, or mood shifts. Think of T3 as your body’s metabolic spark plug.
Immune proteins that attack the thyroid. High levels may cause autoimmune thyroid disease like Graves’. They show if your immune system is targeting your thyroid.
Antibodies that attack thyroid proteins. High levels can mean Hashimoto’s thyroiditis. They’re a sign of hidden thyroid autoimmunity.
Immune markers that target the thyroid enzyme TPO. High TPO often signals Hashimoto’s. They’re an early clue for thyroid disease.
A reproductive hormone that controls ovulation in women and testosterone production in men. Abnormal LH can affect fertility and hormone balance. It’s a key signal for reproductive health.
A hormone that helps eggs mature in women and supports sperm production in men. Abnormal FSH can point to fertility or hormone issues. It’s your body’s “reproductive starter.”
The main form of estrogen. Too low or too high affects menstrual cycles, bone health, and heart risk. It’s central to women’s reproductive and overall health.
A hormone important for menstrual cycles and pregnancy. Low levels may cause cycle irregularities or fertility challenges. Think of it as the hormone that balances estrogen.
The main male sex hormone, also important in women. Too little or too much affects energy, mood, muscle, and libido. It’s your vitality hormone.
The active form of testosterone available for your body to use. Abnormal levels affect muscle, sex drive, and well-being. It’s the “ready-to-go” testosterone.
A hormone made by the adrenal glands. Low or high levels affect energy, mood, and aging. It’s the raw material for other sex hormones.
A protein that carries sex hormones in your blood. Too high or too low SHBG changes how much free testosterone and estrogen are active. It’s the traffic controller for sex hormones.
A hormone that supports breast milk production. Abnormal prolactin can affect fertility and hormone balance in both sexes. It’s also linked to stress and pituitary health.
The main stress hormone. Too much or too little affects energy, sleep, weight, and mood. It’s your body’s stress barometer.
A hormone that balances salt and water in your body. Abnormal levels can affect blood pressure and hydration. It’s your fluid and pressure regulator.
A marker of how testosterone is being metabolized. Abnormal levels may point to hormone imbalance or excessive androgens. It’s a window into how your body processes sex hormon
A hormone that controls calcium and bone health. High or low PTH affects bone strength and metabolism. It’s your skeleton’s hormone guide.
A hormone from the thyroid that helps regulate calcium. Abnormal calcitonin can flag thyroid or calcium problems. It’s your calcium “balancer.”
The total number of immune cells in your blood. Too high or too low may signal infection, inflammation, or immune imbalance. It’s your body’s frontline defense count.
The most common white blood cells, fighting bacteria. Abnormal levels may point to infection or inflammation. They’re your body’s first responders.
Immune cells that fight viruses and control immunity. Too many or too few can signal infection, stress, or immune disorders. They’re your virus fighters.
Immune cells that help clean up infection and dead cells. High levels may mean ongoing inflammation. They’re your cleanup crew.
White blood cells linked to allergies and parasites. High levels can point to asthma, allergies, or certain infections. They’re your allergy sentinels.
The rarest type of white blood cell. High levels may relate to allergies or inflammation. Think of them as your body’s “allergy signalers.”
A marker of inflammation in the blood. Elevated CRP shows your immune system is active. It’s your inflammation alarm. (already included under Heart but also relevant here)
A measure of allergic sensitivity. High IgE suggests stronger allergic responses. It’s your immune system’s “allergy meter.”
A waste product filtered by the kidneys. High creatinine can signal reduced kidney function. It’s your kidney performance check.
An estimate of how well your kidneys are filtering. A low eGFR means kidney stress or damage. Think of it as your kidney’s “filter speed.”
Compares two waste products filtered by the kidneys. Abnormal ratios may signal dehydration or kidney problems. It’s a hydration vs. kidney health balance.
A waste product made when the body breaks down protein. High or low levels may point to kidney, liver, or diet issues. It’s your protein metabolism tracker.
Shows if your kidneys are leaking protein. High levels are an early warning sign for kidney disease. It’s like a leak test for your kidneys.
An essential mineral that balances fluids and nerves. Too high or too low can cause dehydration, confusion, or muscle problems. It’s your body’s fluid balance signal.
A mineral that keeps your heart and muscles working properly. Abnormal levels can cause dangerous heart rhythm changes. It’s your heartbeat’s steady rhythm maker.
A mineral that works with sodium to balance fluids and acidity. Low or high chloride may signal kidney or acid–base problems. It’s your fluid and acid balance partner.
A measure of acid–base balance in the blood. Abnormal bicarbonate can point to breathing or kidney problems. It’s your pH buffer.
A gas measured in blood to check acid–base balance. Too much or too little may reflect lung or metabolic issues. It’s your body’s breathing balance marker.
Shows how concentrated your blood is. Abnormal values may signal dehydration, kidney, or fluid balance issues. It’s your hydration balance check.
Shows how concentrated your blood is. Abnormal values may signal dehydration, kidney, or fluid balance issues. It’s your hydration balance check.
A mineral that works with calcium for bones and energy. Abnormal levels can affect bone strength and kidney health. It’s your body’s energy mineral.
A mineral important for muscle, nerve, and energy balance. Low magnesium can cause cramps, fatigue, or heart rhythm changes. It’s your natural muscle relaxer.
Proteins that show how well your liver is working. High levels can signal liver stress, alcohol effects, or medication overload. They’re your liver’s status report.
A substance made when red blood cells break down. High bilirubin can mean liver, gallbladder, or blood problems. It’s your yellow flag for liver and blood health.
Measures all proteins in your blood. Abnormal levels may point to liver, kidney, or nutrition issues. It’s your body’s protein reserve check.
The main blood protein made by the liver. Low albumin may signal poor nutrition, liver, or kidney issues. It’s your body’s transport protein.
Proteins that include antibodies and transporters. Abnormal levels can affect immunity or liver function. They’re your blood’s “support proteins.”
An enzyme released when muscles are stressed or damaged. High CK may signal muscle strain, injury, or disease. It’s your muscle breakdown marker.
A digestive enzyme made by the pancreas. High or low levels can signal pancreas or digestive problems. It’s your starch-digesting helper.
Another digestive enzyme from the pancreas. High lipase often means pancreas inflammation. It’s your fat-digesting helper.
A protein made by the prostate gland. High PSA can signal prostate enlargement, inflammation, or cancer risk. It’s your prostate health checkpoint.
A vitamin that supports bones, muscles, and immunity. Low vitamin D weakens bones and lowers immune defenses. It’s your sunshine vitamin.
Important for vision, skin, and immunity. Too little or too much can harm health. It’s your eye and skin protector.
An antioxidant that protects cells from damage. Low levels can weaken defense against stress and aging. It’s your cell bodyguard.
A vitamin vital for nerves and red blood cells. Low B12 can cause fatigue, memory problems, and anemia. It’s your energy and brain vitamin.
Essential for making DNA and red blood cells. Low folate can cause anemia and pregnancy risks. It’s your growth and repair vitamin.
A marker of vitamin B12 activity. High MMA means your body isn’t using B12 well. It’s the hidden detector of B12 deficiency.
A protein that stores iron. Low ferritin signals low iron reserves, while high levels may show overload. It’s your iron storage tank.
A mineral needed to make red blood cells. Too little causes anemia, too much can damage organs. It’s your oxygen carrier.
A protein that transports iron in the blood. Low saturation can mean deficiency, while high can mean overload. It’s your iron delivery system.
Shows how much iron your blood can carry. Abnormal values help detect deficiency or overload. It’s your iron “capacity check.”
A trace mineral for energy, immunity, and brain health. Too high or low affects nerves, blood, and metabolism. It’s your spark mineral.
Important for immunity, healing, and hormones. Low zinc weakens immunity and energy. It’s your repair mineral.
A mineral that supports thyroid and antioxidant defenses. Low selenium can reduce energy and immunity. It’s your body’s antioxidant booster.
The protein in red blood cells that carries oxygen. Low hemoglobin means anemia and fatigue, high levels may signal other blood issues. It’s your body’s oxygen transporter.
Hematocrit The percentage of blood made up of red cells. Low levels mean anemia, high levels can thicken the blood. It’s your blood concentration check.
The number of red blood cells in your blood. Too few means low oxygen delivery, too many can stress the heart. It’s your blood’s oxygen delivery team size.
Often called “bad cholesterol.” Elevated LDL can clog arteries and raise your risk of heart disease. Knowing your LDL helps you protect your arteries and heart.
The average amount of hemoglobin per red blood cell. Low levels often mean iron deficiency. It’s your oxygen “loading capacity.”
The concentration of hemoglobin inside red cells. Abnormal results can signal anemia. It’s your hemoglobin density check.
A measure of size variation among red blood cells. High RDW often points to nutrient deficiencies. It’s your red cell uniformity test.
Young red blood cells just released from bone marrow. High or low counts help show how well your body is making blood. It’s your red cell production line check.
The number of platelets that help blood clot. Low levels increase bleeding risk, high levels can raise clot risk. It’s your clotting crew count.
The average size of platelets. Larger platelets may mean more active clotting. It’s your platelet size check.
A natural waste product from breaking down purines. High levels can cause gout or kidney stones. It’s your uric balance marker.
A measure of how concentrated your blood is. Abnormal levels can signal dehydration or fluid imbalance. It’s your hydration balance check.
A measure of acid–base balance in the blood. Abnormal levels may reflect breathing or kidney issues. It’s your body’s pH buffer.