Get tested with Superpower

If you’ve been postponing blood testing for years or feel frustrated by doctor appointments and limited lab panels, you are not alone. Standard healthcare is often reactive, focusing on testing only after symptoms appear or leaving patients in the dark.

Superpower flips that approach. We give you full insight into your body with over 100 biomarkers, personalized action plans, long-term tracking, and answers to your questions, so you can stay ahead of any health issues.

With physician-reviewed results, CLIA-certified labs, and the option for at-home blood draws, Superpower is designed for people who want clarity, convenience, and real accountability - all in one place.

Key benefits of Creatinine testing

• Measures kidney function by tracking how well your body filters waste.
• Spots early kidney stress before you feel symptoms or damage becomes permanent.
• Flags dehydration, muscle breakdown, or medication effects that raise creatinine levels.
• Guides safe dosing of medications cleared by your kidneys to prevent toxicity.
• Tracks kidney health over time if you have diabetes, hypertension, or autoimmune disease.
• Explains fatigue, swelling, or changes in urination that may signal kidney decline.
• Best interpreted with eGFR and urine tests to assess full kidney function.

What is Creatinine?

Creatinine is a waste product that forms when creatine breaks down in your muscles. Creatine is a molecule your muscles use for quick bursts of energy during contraction. After it's used, a small amount converts spontaneously into creatinine every day at a fairly steady rate.

Your body doesn't reuse creatinine. Instead, it travels through your bloodstream to your kidneys, which filter it out and send it into your urine for elimination. Because your muscles produce creatinine at a consistent pace and healthy kidneys clear it efficiently, the amount circulating in your blood stays relatively stable.

Your kidneys' daily report card

Creatinine serves as a reliable marker of kidney filtration performance. When your kidneys work well, they remove creatinine steadily and keep blood levels low. If kidney function declines, creatinine begins to accumulate in the bloodstream.

A window into muscle mass

Because creatinine comes from muscle breakdown, people with more muscle mass naturally produce more of it. This makes creatinine levels a subtle reflection of your body's muscle content.

Why is Creatinine important?

Creatinine is a waste product generated by your muscles during normal daily activity and filtered out of your blood by your kidneys. Measuring it reveals how well your kidneys are clearing toxins and maintaining the chemical balance your body depends on to function. When creatinine levels shift outside the typical range - roughly 0.6 to 1.2 in most adults - it signals changes in kidney performance, muscle mass, or hydration that can ripple across multiple organ systems.

When creatinine runs low

Lower-than-normal creatinine often reflects reduced muscle mass, which can occur with aging, malnutrition, chronic illness, or prolonged inactivity. It may also appear during pregnancy as blood volume expands and kidneys filter more efficiently. While low creatinine itself rarely causes symptoms, it can mask underlying muscle wasting or liver disease that deserves attention.

When creatinine climbs high

Elevated creatinine typically means your kidneys aren't filtering waste as effectively as they should. This can stem from acute kidney injury, chronic kidney disease, dehydration, or conditions like diabetes and high blood pressure that damage the kidney's delicate filtering units over time. Symptoms may include fatigue, swelling in the legs or face, changes in urination, and confusion as toxins accumulate.

The bigger picture

Creatinine serves as a window into kidney health, which in turn governs fluid balance, blood pressure, electrolyte stability, and red blood cell production. Tracking it over time helps detect silent kidney decline before irreversible damage occurs, protecting heart health and overall longevity.

What do my Creatinine results mean?

Low creatinine values

Low values usually reflect reduced muscle mass or decreased creatinine production. Creatinine is a waste product generated continuously by muscle tissue and filtered out by the kidneys. When muscle mass is low due to aging, prolonged illness, malnutrition, or muscle-wasting conditions, less creatinine enters the bloodstream. Very low values may also appear during pregnancy due to increased kidney filtration and expanded blood volume, which dilutes the concentration. In rare cases, severe liver disease reduces creatinine synthesis.

Optimal creatinine values

Being in range suggests that muscle mass is adequate and kidney filtration is functioning normally. Creatinine levels remain fairly stable day to day in healthy individuals, making this marker a reliable baseline for assessing kidney function over time. Optimal values tend to sit in the mid to upper portion of the reference range for adults with normal muscle mass.

High creatinine values

High values usually reflect reduced kidney filtration capacity, meaning the kidneys are not clearing creatinine efficiently from the blood. This can occur with acute kidney injury, chronic kidney disease, dehydration, or conditions that impair blood flow to the kidneys. High creatinine may also appear in individuals with very high muscle mass or after intense exercise, though this is less common.

Factors that influence creatinine interpretation

Creatinine varies with age, sex, muscle mass, hydration status, and certain medications. Men typically have higher values than women due to greater muscle mass. Results should always be interpreted alongside clinical context and kidney function estimates.