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HDL42
Triglycerides180
ApoB110
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Alanine Aminotransferase (ALT)mg/dL
Gamma-Glutamyl Transferase (GGT)mg/dL
Alkaline Phosphatase (ALP)mg/dL
266 U/L very high
0 from your result
elevatedvery high
1normal 5 to 41500
what this means

266 is very high for AST, enough that the number itself is the problem.

this is the average reading · make it yours below

reading as

This level is usually treated as urgent. A result this far outside the range is normally checked by a doctor promptly, not at your next routine appointment.

You are 225 U/L over the normal ceiling of 41. That reads very high.

266 is very high. That is above the normal range for AST. How much it matters depends on the markers it travels with, which is what the sections below are rewritten against.

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Your BloodMarker report · Aspartate Aminotransferase (AST)

Aspartate Aminotransferase (AST) 266 U/L: Is That High?

Yes. 266 U/L is well outside the normal range for AST.

But a number alone is only half the story. Your Alanine Aminotransferase (ALT), Gamma-Glutamyl Transferase (GGT) and your risk factors decide how much it means. Tell it who you are.

Reviewed against ALF, NIH, Mayo Clinic, AGA guidelines · Last reviewed March 22, 2026

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YOUR NUMBERS

Normal: <40
Raised: 40-79
High: 80+

Values in U/L. Your Aspartate Aminotransferase (AST) of 266 is marked.

What they say together.

Aspartate Aminotransferase (AST) is read as part of a set. Add the ones printed next to it on your test and the figures below work themselves out, with the ranges this page uses for each.

U/LHIGH
U/LexampleNORMAL
U/LexampleRAISED
266 ÷ 38 =7AST to ALT ratio, the De Ritis ratio. Under 1 is the usual fatty-liver pattern; above 2 points at alcohol.
62 and 381.6GGT against ALT. GGT rising faster than ALT is the pattern that separates alcohol and bile flow from fat in the liver.
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Is Aspartate Aminotransferase (AST) 266 U/L Low, Normal, or High?

Aspartate Aminotransferase (AST) 266 U/L might be considered higher than typical levels. This specific value suggests that this enzyme, naturally present inside various cells in your body, could be more active or present in larger amounts outside those cells.

While individual situations vary, a reading like this is generally outside the range usually seen in healthy adults. Understanding what this value means for your body can be a valuable step in your health journey.

what this page cannot tell you

The AST/ALT ratio above 2:1 suggests alcoholic liver disease. Near 1:1 points to non-alcoholic fatty liver. Which is yours?

This page has not been given your ALT, so that half of the picture is missing here. It is describing the average reader with Aspartate Aminotransferase (AST), not you.

Read mine against my ALT →

An Aspartate Aminotransferase (AST) level of 266 U/L is a critically high value, soaring over 500% above the normal upper limit, and immediately signals significant acute cellular damage, most frequently originating in the liver.

This elevation is concerning and demands urgent medical evaluation, as it doesn't typically resolve without intervention. At this substantial level, common culprits include acute viral hepatitis (such as Hepatitis A, B, or C), severe drug-induced liver injury – even from common medications like acetaminophen if taken in overdose – or acute alcoholic hepatitis.

Less commonly, but still possible, severe muscle damage could contribute, though liver injury is usually the primary focus at this magnitude. To pinpoint the exact cause, your healthcare provider will likely order a comprehensive set of follow-up tests.

These often include other liver function tests like ALT, alkaline phosphatase, and bilirubin to characterize the pattern of injury, as well as specific viral hepatitis panels or drug screens. Imaging studies like an abdominal ultrasound may also be performed to assess liver structure.

A crucial detail to understand is that while an AST of 266 U/L is alarming and indicates an acute problem, it often points to a condition that, once diagnosed and appropriately treated, has the potential for significant improvement.

However, delaying assessment and treatment could lead to further complications, underscoring the necessity for prompt action.

The liver and Aspartate Aminotransferase (AST) LIVER Produces Aspartate Aminotransferase (AST) Blood supply Bile output Elevated Aspartate Aminotransferase (AST) may indicate liver cell damage or stress
for your numbersThe section below is written for 266 against a general adult target. What 266 means for you depends on the rest of your lipids and your other risk factors. Your report starts from your whole picture, not one line.

Hidden Risk of Aspartate Aminotransferase (AST) 266 U/L

An elevated Aspartate Aminotransferase (AST) 266 U/L reading can sometimes point to underlying conditions that might not be immediately obvious. This enzyme is primarily found in the liver, but also in other vital tissues like the heart, skeletal muscles, kidneys, and brain.

When cells in these organs are damaged or inflamed, AST can leak into the bloodstream, leading to higher levels detected. Exploring the potential reasons behind an elevated AST is a crucial step towards understanding one's overall well-being.

Identifying these less obvious influences on your health can empower you to engage more effectively with your healthcare provider. It is important to remember that this single number is one piece of a much larger puzzle, and a deeper look into your health profile is often necessary to uncover any 'hidden' aspects.

Understanding common risk factors and discussing them with your healthcare team is a thoughtful approach to proactive health management.

what this page cannot tell you

AST and ALP together distinguish between liver cell damage and cholestatic disease, which have completely different treatments.

This page has not been given your ALP, so it cannot tell you which of those you are. It is describing the average reader with Aspartate Aminotransferase (AST), not you.

Read mine against my ALP →

An AST level of 266 U/L, significantly exceeding the normal range, signals substantial liver cell injury. This magnitude of elevation increases the risk of acute liver failure, characterized by the liver's inability to perform its vital functions such as detoxification and protein synthesis.

Persistent high AST values at this level can contribute to liver fibrosis progression, potentially leading to cirrhosis over time, which impairs blood flow through the liver and increases the likelihood of portal hypertension complications like ascites and variceal bleeding.

Furthermore, this degree of enzyme leakage suggests an ongoing inflammatory or cytotoxic process that requires immediate attention to prevent irreversible damage and functional decline.

for your numbersThe risk below is the average one for this AST. Whether it applies to you depends on the rest of your panel, which the article has not been given. Add them and this stops describing strangers.
  • Focus on liver health awareness.
  • Consider muscle strain or injury.
  • Explore overall systemic wellness.

This part is about the number

Everything below explains what raises Aspartate Aminotransferase (AST). It cannot tell you which of them is yours.

Your test can. Every marker on it is read against every other one, which is where the answer actually lives.

PDF or a photo of the printout · read in seconds

What Does a Aspartate Aminotransferase (AST) Level of 266 U/L Mean?

Aspartate Aminotransferase (AST) is an enzyme, which is a type of protein that helps speed up chemical reactions in the body. It plays a vital role in metabolism, particularly in how your body processes amino acids, which are the building blocks of proteins.

While AST is present in many cell types throughout the body, it is found in particularly high concentrations within liver cells and muscle cells, including those of the heart. When these cells are healthy and functioning normally, AST largely stays contained within them.

However, if these cells become damaged due to injury, inflammation, or disease, their outer membranes can become compromised. This allows the AST enzyme to escape from the inside of the cells and enter the bloodstream.

Therefore, an Aspartate Aminotransferase (AST) 266 U/L level, being significantly higher than typical, often suggests that there might be some level of cell damage or irritation occurring in one or more of the organs where this enzyme is abundant.

It’s important to understand that an elevated AST doesn't pinpoint the exact cause or location of the damage by itself; it merely signals that something might be happening. Other tests and a comprehensive evaluation are usually needed to determine the specific source and nature of any underlying health concern linked to such a reading.

It serves as a valuable indicator, prompting a closer look into your body's functions and cellular health. For instance, sometimes muscle soreness after intense physical activity can temporarily increase AST levels, but persistent high levels often warrant further investigation into liver health or other organ systems.

An AST reading of 266 U/L is most plausibly linked to acute viral hepatitis (e.g., Hepatitis A, B, or acute flares of Hepatitis C) or significant drug-induced liver injury from a new medication or supplement.

Non-alcoholic fatty liver disease (NAFLD) with superimposed inflammation (NASH) can also reach this level, particularly if compounded by recent dietary indiscretions like high intake of processed foods and sugary beverages.

Less commonly, but still possible at this range, is muscle injury (rhabdomyolysis) or a recent ischemic event affecting the liver, although isolated AST elevation would be unusual in these scenarios without corresponding ALT changes or other clinical markers.

Your AST 266 means different things depending on your other markers

AST + ALT
The AST/ALT ratio above 2:1 suggests alcoholic liver disease. Near 1:1 points to non-alcoholic fatty liver. Which is yours?
AST + ALP
AST and ALP together distinguish between liver cell damage and cholestatic disease, which have completely different treatments.
AST + Creatine Kinase
If your CK is also high, your elevated AST might be from muscle damage, not liver damage at all.
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for your numbersThis section lists every reason AST moves, because on its own the number cannot say which is yours. The rest of your panel and a few risk factors would cross most of them off in a sentence.

Lifestyle Changes for Aspartate Aminotransferase (AST) 266 U/L

Making thoughtful lifestyle choices can play a supportive role in your overall health journey, especially when considering a reading like Aspartate Aminotransferase (AST) 266 U/L. While these general wellness strategies do not specifically target AST levels or substitute for medical guidance, they contribute to a healthier body environment where cells might function more optimally.

Regular, moderate physical activity is one such strategy. Engaging in exercises like brisk walking, cycling, or swimming can promote circulation, help manage body weight, and support metabolic health. However, it's important to find a balance and avoid overexertion, especially if muscle health is a factor in your AST reading, as intense exercise can temporarily increase AST.

Ensuring you get adequate, restful sleep each night is another cornerstone of well-being. Sleep allows your body to repair and regenerate cells, which is crucial for maintaining cellular integrity across all organ systems.

Managing stress effectively also holds significant value. Chronic stress can impact various bodily functions, and finding healthy coping mechanisms like mindfulness, meditation, or hobbies can support your body's equilibrium. Furthermore, avoiding harmful substances, such as excessive alcohol, which is a known liver stressor, is critical for supporting liver health.

The American Heart Association (AHA) and other health organizations consistently advocate for these broad healthy lifestyle practices as foundational for cardiovascular health and overall vitality. These adaptations are about cultivating a balanced and supportive environment within your body, fostering general resilience and potentially influencing your Aspartate Aminotransferase (AST) levels positively over time through improved overall health.

With an AST of 266 U/L, immediate medical re-evaluation is critical. Schedule a follow-up appointment with your physician within 24-48 hours for repeat testing, specifically ordering ALT, alkaline phosphatase, bilirubin, and GGT to assess the pattern of liver enzyme elevation and overall liver function.

Discuss all current medications, supplements, and recent alcohol consumption. Based on initial findings, your doctor will likely recommend abstaining from alcohol and over-the-counter pain relievers like acetaminophen and NSAIDs. Referral to a hepatologist or gastroenterologist specializing in liver disease is indicated for further investigation, potentially including viral hepatitis serologies or liver imaging.

for your numbersThe portions below are generic because the page does not know your body. Add your height and weight above and the fibre targets resize to you at once, a small preview of what the full report does with every number.

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What you actually get

A page like this one, written about you.

You have just spent a few minutes reading a page written for a number. Upload your whole test and you get the same thing written for your body: every marker read against every other, in the order they should be fixed, as something you read rather than a dashboard you have to decode.

  • Read in orderWhich number to deal with first, and which ones are only following it.
  • Written, not chartedThe same voice as this page, about your own blood, on your own page.
  • Every retest joins itThe line builds itself, so the next version shows what moved.

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