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HDL42
Triglycerides180
ApoB110
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Aspartate Aminotransferase (AST)mg/dL
Alanine Aminotransferase (ALT)mg/dL
Gamma-Glutamyl Transferase (GGT)mg/dL
13 U/L low
0 from your result
lownormalmildly elevatedelevated
10normal 30 to 121440
what this means

13 is low, just outside the range for ALP.

this is the average reading · make it yours below

This one sits close to the edge. Not a problem today, but it is the band where small changes decide which way it goes, and where the rest of your panel starts to matter more than this number alone.

You are 17 U/L under the normal floor of 30. That reads low.

13 is low. That is below the normal range for ALP. 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 · Alkaline Phosphatase (ALP)

Alkaline Phosphatase (ALP) 13 U/L: Is That Low?

Not really. 13 U/L is just outside the normal range for ALP.

But a number alone is only half the story. Your Aspartate Aminotransferase (AST), Alanine Aminotransferase (ALT) 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

What they say together.

Alkaline Phosphatase (ALP) 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/L
U/LexampleNORMAL
U/LexampleNORMAL
U/LexampleRAISED
34 ÷ 38 =0.9AST 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 Alkaline Phosphatase (ALP) 13 U/L Low, Normal, or High?

Alkaline Phosphatase (ALP) 13 U/L might be considered on the lower side of what is typically expected for adults. While individual variations are common, this level often falls below the average range seen in many healthy individuals.

Understanding what your ALP value means can offer interesting insights into your body's functions and overall well-being, sparking a deeper curiosity about your health journey.

what this page cannot tell you

ALP elevated with normal ALT points to bone disease or bile duct issues, not liver cell damage. Very different diagnosis.

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

Read mine against my ALT →

An Alkaline Phosphatase (ALP) level of 13 U/L is notably low, falling significantly below the normal reference range of 30-120 U/L, and signals a need for immediate clinical investigation. This stark deviation, 57% below the lower normal limit, isn't a minor fluctuation but rather points towards specific underlying conditions that warrant a thorough diagnostic approach.

Chief among concerns for such a profoundly low ALP is Hypophosphatasia (HPP), a rare genetic disorder affecting bone and tooth mineralization, which can manifest in various severities, including milder adult forms often characterized by dental issues or recurrent fractures.

Other potential causes at this markedly reduced level include severe nutritional deficiencies, particularly of zinc or magnesium, or even certain forms of severe anemia or hypothyroidism. To pinpoint the exact etiology, a clinician would typically order a battery of further tests.

These might include bone-specific ALP isoenzymes, Vitamin B6 levels, parathyroid hormone (PTH), and calcium/phosphate levels. Genetic testing for the ALPL gene might be considered if HPP is strongly suspected, alongside a thorough dietary assessment.

Patients should understand that a value this low is considerably less common than elevated ALP and demands comprehensive investigation, as it often reflects a systemic issue requiring targeted management rather than general observation.

The liver and Alkaline Phosphatase (ALP) LIVER Produces Alkaline Phosphatase (ALP) Blood supply Bile output Elevated Alkaline Phosphatase (ALP) may indicate liver cell damage or stress
for your numbersThe section below is written for 13 against a general adult target. What 13 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.
for your numbersThe risk below is the average one for this ALP. 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.

Hidden Risk of Alkaline Phosphatase (ALP) 13 U/L

Understanding the full picture of your health markers, including Alkaline Phosphatase (ALP) 13 U/L, involves looking beyond a single number. Sometimes, a value that appears low or high might be an isolated finding with no significant health implications, while other times it could hint at underlying processes in the body that warrant further exploration.

For a level like Alkaline Phosphatase (ALP) 13 U/L, it's about connecting the dots with other aspects of your health rather than jumping to conclusions. The meaning of any lab result is always best understood within the context of your overall health, symptoms, and medical history.

Factors that might be considered alongside your specific Alkaline Phosphatase (ALP) 13 U/L level include a variety of influences that support or impact bone and liver health. An exceptionally low ALP level could, in rare instances, be associated with certain conditions related to bone metabolism or nutrient absorption, but this is always part of a much larger diagnostic puzzle. It is important to consider all aspects of your personal health profile.

what this page cannot tell you

Both elevated together strongly suggests bile duct obstruction or cholestatic liver disease.

This page has not been given your Total Bilirubin, so that half of the picture is missing here. It is describing the average reader with Alkaline Phosphatase (ALP), not you.

Read mine against my Total Bilirubin →

A significantly low alkaline phosphatase level, such as the value of 13 U/L, raises concerns about potential impaired bone mineralization and growth, particularly in younger individuals. This value suggests insufficient activity of ALP, an enzyme critical for adding phosphate to bone matrix.

Prolonged deficiency could theoretically lead to rickets or osteomalacia, characterized by soft, weak bones due to inadequate calcium and phosphate deposition. While severe deficiencies are rare, this low reading warrants investigation to rule out underlying conditions that might compromise bone integrity and overall skeletal development over time, potentially manifesting as bone pain or increased fracture susceptibility.

for your numbersThis section lists every reason ALP 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.
  • Your personal health story plays a big role.
  • Other health indicators provide important clues.

This part is about the number

Everything below explains what raises Alkaline Phosphatase (ALP). 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 Alkaline Phosphatase (ALP) Level of 13 U/L Mean?

Alkaline Phosphatase, often called ALP, is an enzyme. Think of enzymes as tiny helpers that speed up chemical reactions in your body. ALP is found in many places, most notably in your bones and liver, but also in your kidneys and intestines.

Its main jobs are related to bone formation and liver function, helping processes like breaking down proteins. When we talk about an Alkaline Phosphatase (ALP) 13 U/L level, we're looking at how much of this specific enzyme is circulating.

A low level, such as Alkaline Phosphatase (ALP) 13 U/L, doesn't automatically point to a problem, but it invites a closer look at what could be influencing it. For some individuals, a low ALP might simply be their normal baseline, reflecting unique personal biology.

However, in other cases, a consistently low ALP could potentially relate to certain nutritional factors, such as a deficiency in zinc or magnesium, which are important for ALP's activity. It might also be observed in specific, much less common, conditions affecting bone growth or metabolism.

The National Institutes of Health emphasizes the importance of interpreting lab values in a broader clinical context. This means that a single reading, even Alkaline Phosphatase (ALP) 13 U/L, is just one piece of information, not a standalone diagnosis.

A markedly depressed alkaline phosphatase reading like 13 U/L often points towards specific nutritional deficiencies or certain chronic conditions. Hypophosphatasia, a rare genetic disorder affecting ALP activity, is a primary consideration.

Additionally, severe malnutrition, particularly a lack of essential nutrients like zinc or magnesium involved in enzyme function, or inadequate protein intake, can suppress ALP production. Certain medications, such as those used to treat osteoporosis or epilepsy, have also been associated with lowering this enzyme.

Certain rare anemias or liver conditions, while less common drivers of such a profound drop, could also contribute.

Your ALP 13 means different things depending on your other markers

ALP + ALT
ALP elevated with normal ALT points to bone disease or bile duct issues, not liver cell damage. Very different diagnosis.
ALP + Total Bilirubin
Both elevated together strongly suggests bile duct obstruction or cholestatic liver disease.
ALP + Calcium
High ALP with elevated calcium can indicate hyperparathyroidism or bone metastases requiring imaging.
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The part one number cannot show
Your ALP of 13 means different things depending on its companion markers.
Your full panel shows which story is yours.
See what is driving yours →

Lifestyle Changes for Alkaline Phosphatase (ALP) 13 U/L

Making conscious lifestyle choices is a powerful way to support your overall health and well-being, which in turn can influence various bodily functions, including enzyme activity like Alkaline Phosphatase. While specific lifestyle changes are not a direct treatment for an Alkaline Phosphatase (ALP) 13 U/L level, adopting healthy habits contributes to your body's optimal functioning.

Regular physical activity, for instance, is vital for maintaining strong bones. Bones are where a significant amount of ALP is produced, and supporting bone health through weight-bearing exercises like walking, jogging, or strength training can contribute to their vitality.

The American Academy of Orthopaedic Surgeons often highlights the importance of consistent exercise for bone density and overall skeletal health. Adequate and restful sleep is another cornerstone of good health; it allows your body to repair and regenerate, affecting countless biological processes.

Managing stress effectively through practices like mindfulness, meditation, or spending time in nature can also positively impact your entire system. Chronic stress can have broad effects on the body's balance, and reducing it fosters a more harmonious internal environment.

Staying well-hydrated by drinking enough water throughout the day is fundamental for all bodily functions, including metabolism and nutrient transport. These general, positive lifestyle choices work together to create a foundation for good health, indirectly supporting the intricate balance of your body's enzymes, including Alkaline Phosphatase, and contributing to overall wellness, rather than directly targeting a specific number like Alkaline Phosphatase (ALP) 13 U/L. The focus is always on holistic well-being.

With an alkaline phosphatase at 13 U/L, the immediate next step is a targeted retest within two weeks, confirming the initial result. Simultaneously, a thorough review of diet, focusing on protein, zinc, and magnesium intake, is crucial; consider a consultation with a registered dietitian.

If the low level persists or is associated with symptoms like bone pain or fatigue, referral to a rheumatologist or endocrinologist is recommended to investigate potential underlying conditions like hypophosphatasia or significant metabolic derangements.

Tracking calcium and phosphate levels in conjunction with ALP will provide further diagnostic clues.

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.

Sources

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