Amylase blood test: normal range and what high or low amylase means
Amylase · Amylase (often ordered with lipase); also on some comprehensive panels · reported in U/L (units per liter); some labs report IU/L, which is the same
Amylase is the enzyme that breaks starch down into sugars. Most of it is made by two organs, the pancreas and the salivary glands, and a small amount leaks into the bloodstream all the time, which is what the blood test measures. A normal serum amylase is roughly 30–110 U/L on most US reports (some labs run up to 125 or 140), and the test is ordered mainly when someone has upper abdominal pain and the question is whether the pancreas is inflamed. A level more than three times the upper limit of normal, in a person with typical pain, is one of the accepted criteria for acute pancreatitis.
Amylase has largely been overtaken by lipase for that purpose. Lipase comes only from the pancreas, rises at the same time, stays elevated for a week or more rather than two to three days, and is less often raised by non-pancreatic problems, so many emergency departments now order lipase alone. Amylase remains useful when lipase is unavailable, when the problem might be a salivary gland (mumps, salivary stones, bulimia), and in the puzzle of a persistently high amylase with no symptoms, which often turns out to be a harmless condition called macroamylasemia.
A high amylase is therefore not the same as pancreatitis. Kidney disease, a perforated ulcer, bowel obstruction, an ectopic pregnancy, opioid painkillers and simple vomiting can all raise it, usually to less than three times normal. A low amylase gets far less attention and rarely matters on its own, although a chronically low level can reflect a pancreas that has lost much of its enzyme-producing tissue, and population studies link low amylase to obesity and type 2 diabetes.
Amylase at a glance
- What it is: a starch-digesting enzyme from the pancreas (P-type) and salivary glands (S-type); the blood test measures the total of both unless a pancreatic isoenzyme is ordered.
- Normal: about 30–110 U/L in adults (labs vary, some up to 125–140 U/L); children under 1 year have much lower levels.
- High: over 3 times the upper limit of normal (roughly over 300–400 U/L) with upper abdominal pain suggests acute pancreatitis; smaller rises have many other causes.
- Amylase rises 6 to 24 hours after pancreatitis starts, peaks at about 48 hours and is back to normal in 3 to 7 days; lipase stays up longer and is now the preferred test.
- Low: under about 30 U/L; usually unimportant, but can reflect chronic pancreatitis, cystic fibrosis or previous pancreatic surgery.
- Next step: a high amylase is paired with lipase, liver tests, calcium, triglycerides and often an ultrasound or CT; a mildly high level in someone who feels well is repeated and checked against urine amylase.
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What Amylase measures
Alpha-amylase is secreted by pancreatic acinar cells into pancreatic juice and by the parotid and other salivary glands into saliva. A small fraction of each enters the blood, and in a healthy adult serum amylase is roughly 40 to 45 percent pancreatic and 55 to 60 percent salivary. The molecule is small enough to be filtered by the kidneys, so about a quarter is cleared in the urine (which is why urine amylase can be measured too) and the rest is broken down in the reticuloendothelial system. Its half-life in blood is only 10 to 12 hours, which explains why a rise after pancreatitis is brief.
The standard test measures total amylase activity with a colorimetric substrate assay and reports it in units per liter. Some laboratories also offer pancreatic amylase (P-amylase), which uses an antibody to block the salivary isoenzyme; a high total amylase with a normal P-amylase points to a salivary source or to macroamylasemia. Reference ranges differ noticeably between assays, so a value of 120 is high on a report whose range tops out at 110 and normal on one that goes to 140. Fasting is not required, although a large meal shortly before can nudge levels up slightly.
In acute pancreatitis, damaged acinar cells leak enzyme into the circulation within 6 to 12 hours, levels peak at 24 to 48 hours and return to normal within 3 to 7 days. Because the window is short, a normal amylase in someone whose pain began three days ago does not exclude pancreatitis, and in people with alcohol-related pancreatitis or very high triglycerides amylase can be normal even at presentation. Lipase, which rises at the same time but stays elevated for 8 to 14 days and is not made by salivary glands, is more sensitive and specific, which is why guidelines now recommend it in preference.
Normal range for Amylase
Reference ranges vary between labs and by age, sex and pregnancy. Use the range printed on your own report.
| Group | Typical range (U/L (units per liter); some labs report IU/L, which is the same) | Notes |
|---|---|---|
| Adults, typical reference range | 30–110 U/L | Labs differ; ranges of 25–125 U/L and 40–140 U/L are also common. Use the range printed on your report. |
| Adults, pancreatic amylase (P-amylase) | About 13–53 U/L | Only reported when specifically ordered; isolates the pancreatic fraction. |
| Infants under 1 year | Roughly 5–65 U/L | Pancreatic amylase production is low at birth and reaches adult levels by about 1 year. |
| Older adults | Slightly higher than younger adults | The upper limit rises a little with age, partly from declining kidney clearance. |
| Mild elevation | Up to 3 times the upper limit (roughly 110–330 U/L) | Kidney disease, salivary gland problems, bowel disorders, medications, macroamylasemia, early or mild pancreatitis. |
| Diagnostic threshold for acute pancreatitis | More than 3 times the upper limit (roughly above 330–400 U/L) | One of three Atlanta criteria (with typical pain and imaging). Height of the rise does not predict severity. |
| Marked elevation | Above 1,000 U/L | Usually acute pancreatitis, especially gallstone pancreatitis, or pancreatic duct obstruction; occasionally macroamylasemia. |
| Low | Below about 30 U/L | Rarely clinically important; seen with chronic pancreatitis, cystic fibrosis and after pancreatic surgery. |
| Urine amylase | Roughly 2–34 U/L on a random sample (labs vary widely) | Low urine amylase with high serum amylase suggests macroamylasemia. |
High amylase
A high amylase means that more enzyme is reaching the bloodstream than usual, either because the pancreas or salivary glands are inflamed or obstructed, because the kidneys are clearing it more slowly, or because it is bound into a large complex that cannot be filtered. The size of the rise is the first clue. A value more than three times the upper limit of normal, together with sudden severe upper abdominal pain that often bores through to the back, is enough to diagnose acute pancreatitis without imaging; the commonest causes in the US are gallstones (about 40 percent) and alcohol (about 30 percent), followed by very high triglycerides, medications and post-ERCP inflammation.
Rises of less than three times normal are much less specific. Reduced kidney function alone can double amylase. A perforated stomach ulcer, bowel obstruction, mesenteric ischemia, appendicitis, a ruptured ectopic pregnancy or an ovarian cyst can all leak amylase into the abdominal cavity and then the blood, which is why a mildly raised amylase in someone with severe pain still needs imaging even when pancreatitis seems unlikely. Salivary causes (mumps, parotid stones, bulimia, heavy alcohol use) raise the S-type isoenzyme and leave lipase normal.
Amylase does not grade the severity of pancreatitis: a level of 400 and a level of 4,000 carry the same prognosis, and severity is judged instead by CRP, hematocrit, BUN, creatinine, calcium and how the person looks over the first 48 hours. In someone with no symptoms at all, a persistently high amylase is most often macroamylasemia, in which the enzyme is bound to an immunoglobulin, and a low urine amylase or an amylase-to-creatinine clearance ratio under 1 percent confirms it; it needs no treatment.
Common causes
Acute pancreatitis
Gallstones blocking the pancreatic duct and alcohol account for about 70 percent of cases; triglycerides above 1,000 mg/dL, ERCP, medications, trauma, very high calcium and genetic causes make up most of the rest. Amylase typically exceeds 3 times normal within 24 hours.
Chronic pancreatitis flare or pancreatic duct obstruction
A pancreatic tumor, cyst, stone or stricture obstructing the duct raises amylase modestly; in long-standing chronic pancreatitis the gland may have too little tissue left to raise it much.
Kidney disease
The kidneys clear about a quarter of circulating amylase; with an eGFR under about 50 mL/min levels commonly rise to 1.5 to 3 times normal with no pancreatic disease at all.
Macroamylasemia
In 1 to 2 percent of people amylase binds to IgA or IgG, forming a complex too large for the kidney to filter, so serum amylase runs 2 to 8 times normal indefinitely while urine amylase is low. It is harmless and more common in celiac disease and autoimmune conditions.
Salivary gland disease
Mumps, bacterial parotitis, salivary duct stones, Sjogren's syndrome and radiation to the head and neck raise the salivary isoenzyme; lipase stays normal.
Eating disorders and heavy alcohol use
Repeated vomiting in bulimia and alcohol-related parotid enlargement raise salivary amylase, typically to 1.5 to 3 times normal; an isolated high amylase with normal lipase in a young woman is a recognized clue to purging.
Other abdominal emergencies
Perforated peptic ulcer, small bowel obstruction, mesenteric ischemia, appendicitis, peritonitis and a leaking aortic aneurysm release amylase from the gut wall or inflamed peritoneum, usually to less than 3 times normal.
Ectopic pregnancy, ovarian cysts and tumors
The fallopian tubes and ovaries contain salivary-type amylase; a ruptured ectopic pregnancy or ovarian cyst can raise serum amylase, as can ovarian and lung cancers that secrete it.
Medications
Opioids such as morphine and codeine constrict the sphincter of Oddi and can raise amylase 2 to 15 times within hours of a dose; valproate, azathioprine, thiazides, furosemide, estrogens, some HIV drugs and asparaginase can cause drug-induced pancreatitis.
Diabetic ketoacidosis, trauma and recent surgery
Amylase is raised in up to a third of people with DKA (often salivary type) without pancreatitis; abdominal trauma, cardiac bypass surgery and any abdominal operation can transiently raise it.
Symptoms that can go with it
- Severe, steady upper abdominal pain, often radiating to the back and worse lying flat, with pancreatitis
- Nausea and repeated vomiting
- Fever, fast heart rate and a tender, swollen abdomen
- Yellowing of the eyes or skin and pale stools if a gallstone is also blocking the bile duct
- Painful swelling in front of or below the ears with salivary gland causes (mumps, parotitis, stones)
- No symptoms at all with macroamylasemia and many drug-related or kidney-related rises
- One-sided lower abdominal pain, missed period or vaginal bleeding with ectopic pregnancy
Low amylase
A low amylase is rarely reported as a problem and most laboratories do not even flag it. Healthy people vary widely, and a result of 25 U/L on a range starting at 30 usually means nothing. When it is meaningful, it signals that the pancreas has lost much of its enzyme-producing (acinar) tissue, as in long-standing chronic pancreatitis, cystic fibrosis, advanced pancreatic cancer or after part of the pancreas has been removed. In those situations the question is not the amylase itself but whether digestion is impaired, which is checked with a fecal elastase test and symptoms such as greasy stools and weight loss.
Large population studies in Japan and the US have also found that people with low-normal serum amylase (roughly under 40 to 60 U/L) are more likely to be obese, to have metabolic syndrome, fatty liver and type 2 diabetes, and that low amylase predicts future diabetes. The mechanism is thought to be reduced pancreatic exocrine function in insulin resistance and reduced salivary amylase gene copies. This is an association rather than a diagnosis; a low amylase on its own is not a reason to test for diabetes, but it fits alongside the other markers of metabolic risk.
Common causes
Chronic pancreatitis (burned-out gland)
After years of alcohol-related or other chronic pancreatitis, so little acinar tissue remains that amylase and lipase fall below normal; by this stage fecal elastase is usually low and fat malabsorption is present.
Cystic fibrosis
About 85 percent of people with cystic fibrosis have pancreatic insufficiency from blocked ducts and fibrosis, with low pancreatic amylase from infancy.
Pancreatic surgery or advanced pancreatic cancer
Removal of most of the pancreas, or replacement of the gland by tumor, removes the source of P-amylase.
Obesity, metabolic syndrome and type 2 diabetes
Serum amylase is 10 to 20 percent lower on average in people with insulin resistance and diabetes, and low amylase predicts incident diabetes in cohort studies; the effect is modest and overlaps heavily with normal.
Severe hypertriglyceridemia
Triglycerides above about 1,000 mg/dL interfere with the amylase assay and can make the result read falsely low or normal even during pancreatitis; the lab can dilute the sample to correct it.
Severe liver disease and malnutrition
Advanced cirrhosis and protein-calorie malnutrition reduce enzyme synthesis; in anorexia nervosa amylase is more often high (salivary) than low.
Symptoms that can go with it
- Usually none; a mildly low amylase in a healthy person is not a disease
- Bulky, pale, greasy, foul-smelling stools that float (steatorrhea) when pancreatic insufficiency is the cause
- Weight loss despite a normal appetite
- Bloating, cramping and diarrhea after fatty meals
- Easy bruising, night vision problems or bone pain from fat-soluble vitamin deficiency in long-standing insufficiency
Read it alongside
- Lipase — the preferred pancreatic enzyme; raised with amylase in pancreatitis, normal when the amylase is salivary or macroamylase.
- ALT, AST and bilirubin — an ALT above about 150 U/L with pancreatitis makes gallstones the likely cause; bilirubin and alkaline phosphatase rise if a stone is blocking the bile duct.
- Triglycerides — above 1,000 mg/dL is a cause of pancreatitis in its own right and can falsely lower amylase.
- Calcium — high calcium can cause pancreatitis; low calcium during an attack is a severity marker.
- Creatinine and eGFR — reduced kidney function raises amylase without any pancreatic disease.
- CRP — above 150 mg/L at 48 hours predicts severe pancreatitis; amylase itself does not grade severity.
- Urine amylase or amylase-creatinine clearance ratio — low urine amylase with high serum amylase identifies macroamylasemia.
- Fecal elastase — the test for pancreatic insufficiency when amylase is low and digestion is poor.
What usually happens next
- With abdominal pain and an amylase more than 3 times normal, expect a lipase, liver tests, calcium, triglycerides, CBC and an abdominal ultrasound to look for gallstones; CT is reserved for uncertain diagnoses or suspected complications after 48 to 72 hours.
- A mildly raised amylase (under 3 times normal) is interpreted with lipase and kidney function; if lipase is normal, a salivary cause, kidney disease, medication or macroamylasemia is more likely than pancreatitis.
- If you feel well and the amylase is persistently high, ask for a urine amylase or amylase-to-creatinine clearance ratio and a pancreatic isoenzyme; a ratio under 1 percent confirms macroamylasemia and no further tests are needed.
- Review medications, especially opioids taken shortly before the blood draw, which can raise amylase for several hours.
- After pancreatitis, the useful questions are what caused it (gallstones, alcohol, triglycerides, medication, genetics) and how to prevent the next attack; a repeat amylase is not needed once symptoms have settled.
- A low amylase with weight loss or greasy stools warrants a fecal elastase and a conversation about pancreatic enzyme replacement.
Diet, lifestyle and natural levers with evidence
What can move Amylase once the cause is known. Nothing here replaces finding the cause.
Reduce or stop alcohol
Strong evidenceAlcohol causes roughly 30 percent of acute pancreatitis and 40 to 70 percent of chronic pancreatitis in the US; risk rises steeply above about 4 to 5 drinks a day sustained for years, and binge drinking triggers attacks in susceptible people. In a randomized trial, a structured intervention that reduced drinking after a first alcohol-related attack cut recurrence from 34 percent to 8 percent over two years. Heavy drinking also raises baseline salivary amylase through parotid enlargement.
Stop smoking
Strong evidenceSmoking is an independent risk factor for both acute and chronic pancreatitis, roughly doubling the risk of acute pancreatitis and tripling the risk of chronic pancreatitis in meta-analyses, with a dose-response relationship and a fall in risk within about a decade of quitting. In people who already have chronic pancreatitis, continued smoking speeds calcification and loss of pancreatic function. It also roughly doubles the risk of pancreatic cancer.
Lower triglycerides (diet, weight, omega-3)
Moderate evidenceTriglycerides above 1,000 mg/dL cause 2 to 10 percent of acute pancreatitis and keeping them under 500 largely prevents recurrence. Cutting alcohol and refined sugar, losing weight and controlling diabetes typically lower triglycerides by 20 to 50 percent, and prescription-strength omega-3 (2 to 4 g EPA plus DHA a day) lowers them a further 20 to 30 percent; a very low fat diet (under 10 to 15 percent of calories) is used in the severe genetic forms.
People with triglycerides above 500 mg/dL usually need fibrate or other prescription treatment as well; omega-3 at high doses increases bleeding tendency with anticoagulants.
Maintain a healthy weight and avoid rapid weight loss
Moderate evidenceObesity roughly doubles the risk of gallstones, the leading cause of acute pancreatitis, and is associated with more severe pancreatitis when it occurs. Gradual weight loss lowers gallstone risk, but losing more than about 1.5 kg (3 lb) a week, very low calorie diets and bariatric surgery raise it sharply because bile becomes supersaturated; in those situations clinicians sometimes prescribe ursodeoxycholic acid to prevent stones.
Coffee
Preliminary evidenceIn cohort studies, people drinking 2 or more cups of coffee a day had about 20 to 30 percent lower rates of gallstone disease and, in some but not all studies, lower rates of non-gallstone pancreatitis, possibly through effects on gallbladder emptying and pancreatic secretion. There are no randomized trials, and coffee is not a treatment for pancreatic disease.
When to see a clinician promptly
- Sudden, severe upper abdominal pain, especially if it spreads to the back, with vomiting, fever or a fast heartbeat: go to an emergency department; acute pancreatitis needs intravenous fluids and monitoring from the first hours.
- Abdominal pain with yellow eyes or skin, dark urine or pale stools, which suggests a gallstone blocking the bile duct and may need urgent ERCP.
- Pancreatitis with confusion, breathlessness, very low urine output or a swollen, rigid abdomen: signs of a severe attack with organ involvement.
- An amylase more than 3 times normal, or any raised amylase with ongoing pain, that has not been explained by a clinician.
- Repeated episodes of upper abdominal pain after meals or alcohol, or a persistently high amylase with weight loss, to look for chronic pancreatitis or a pancreatic mass.
- Greasy, pale stools and unintended weight loss with a low amylase, to be tested for pancreatic insufficiency.
Frequently asked questions
What is a normal amylase level?
Most US laboratories give an adult reference range of about 30–110 U/L, though some use 25–125 or 40–140 U/L, so check the range printed on your report. Infants under a year have much lower levels because the pancreas does not make much amylase at birth. Values up to three times the upper limit are a non-specific finding with many possible causes; values above that, with abdominal pain, point to acute pancreatitis.
Is an amylase of 120, 150 or 200 high?
Yes, mildly. On a typical range ending at 110 U/L, 120 is barely above normal and 150 to 200 is about 1.5 to 2 times the upper limit. Rises of this size are usually not pancreatitis, which generally pushes amylase above 300 to 400; common explanations are reduced kidney function, a salivary gland problem, a recent opioid dose, vomiting or macroamylasemia. If you have abdominal pain, a lipase and imaging settle the question; if you feel well, the test is usually repeated with a urine amylase.
What is the difference between amylase and lipase?
Both are pancreatic digestive enzymes that leak into the blood when the pancreas is inflamed, but lipase comes almost entirely from the pancreas while amylase also comes from the salivary glands and several other tissues. Lipase rises at the same time, stays raised for 8 to 14 days instead of 3 to 7, and is less often raised by kidney disease, bowel problems or salivary conditions, so it is more sensitive and specific and is now the recommended single test. A high amylase with a normal lipase usually means the amylase is not coming from the pancreas.
What level of amylase indicates pancreatitis?
The accepted threshold is more than three times the upper limit of normal, which on most US ranges means above roughly 330 to 400 U/L, together with typical upper abdominal pain. The height of the level does not indicate how severe the attack is; CRP, kidney function, hematocrit and the clinical course over 48 hours do that. Amylase can be normal in pancreatitis if the test is taken more than three days after the pain began, in alcohol-related attacks, or when triglycerides are very high.
Can high amylase mean cancer?
Occasionally. A pancreatic tumor blocking the duct can raise amylase modestly, and some ovarian and lung cancers secrete salivary-type amylase, but the great majority of high amylase results are pancreatitis, kidney disease, salivary problems, medications or macroamylasemia. Amylase is not a screening test for pancreatic cancer; that diagnosis rests on imaging and on symptoms such as painless jaundice, back pain, new diabetes and weight loss.
What causes low amylase?
Most low results are normal variation and mean nothing. A genuinely low pancreatic amylase indicates loss of enzyme-producing tissue, as in long-standing chronic pancreatitis, cystic fibrosis, advanced pancreatic cancer or after pancreatic surgery, and in those cases the real question is whether you are digesting food properly. Population studies also link low-normal amylase to obesity, metabolic syndrome and type 2 diabetes. Very high triglycerides can interfere with the assay and produce a falsely low reading.
What is macroamylasemia?
A harmless condition in which amylase molecules bind to antibodies in the blood, forming complexes too large for the kidneys to filter, so serum amylase stays 2 to 8 times normal indefinitely while urine amylase is low. It affects 1 to 2 percent of people and is more common in celiac disease and autoimmune conditions. It causes no symptoms and needs no treatment, but recognizing it avoids repeated scans; the diagnosis is made from a low urine amylase or an amylase-to-creatinine clearance ratio under 1 percent.
Do I need to fast for an amylase test?
Not usually. Amylase is often drawn urgently in people with abdominal pain who have not fasted. Some laboratories ask for no food for 2 hours and no alcohol for 24 hours before a planned test, because a heavy meal nudges the level up slightly and alcohol can raise it. Tell the clinician about opioid painkillers taken in the previous 24 hours, which can raise amylase several-fold.
References
- Amylase test. MedlinePlus, US National Library of Medicine (2023)View source
- Pancreatitis. Mayo Clinic (2023)View source
- Acute pancreatitis. Merck Manual Professional Version (2024)
- Banks PA, Bollen TL, Dervenis C, et al.. Classification of acute pancreatitis 2012: revision of the Atlanta classification and definitions by international consensus. Gut (2013)
- Tenner S, Vege SS, Sheth SG, et al.. American College of Gastroenterology guidelines: management of acute pancreatitis. American Journal of Gastroenterology (2024)
- Rompianesi G, Hann A, Komolafe O, Pereira SP, Davidson BR, Gurusamy KS. Serum amylase and lipase and urinary trypsinogen and amylase for diagnosis of acute pancreatitis. Cochrane Database of Systematic Reviews (2017)
- Matull WR, Pereira SP, O'Donohue JW. Biochemical markers of acute pancreatitis. Journal of Clinical Pathology (2006)
- Yadav D, Lowenfels AB. The epidemiology of pancreatitis and pancreatic cancer. Gastroenterology (2013)
- Yadav D, Whitcomb DC. The role of alcohol and smoking in pancreatitis. Nature Reviews Gastroenterology and Hepatology (2010)
- Nordback I, Pelli H, Lappalainen-Lehto R, Jarvinen S, Raty S, Sand J. Alcohol intervention for patients with alcoholic pancreatitis: a randomized controlled trial. Gastroenterology (2009)
- Nakajima K. Low serum amylase and obesity, diabetes and metabolic syndrome: a novel interpretation. World Journal of Diabetes (2016)
- Scherer J, Singh VP, Pitchumoni CS, Yadav D. Issues in hypertriglyceridemic pancreatitis: an update. Journal of Clinical Gastroenterology (2014)
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