Fecal elastase-1
A test done on a stool sample that checks how well the pancreas is making its digestive enzymes. Elastase is a pancreatic enzyme that survives passage through the gut, so a low level in the stool signals that the pancreas is not producing enough enzymes to digest food properly.
What it measures
Fecal elastase-1 is measured in a single stool sample and reflects how much digestive enzyme the pancreas is producing. The pancreas normally releases enzymes into the gut to break down fat, protein and starch. Elastase is one of these enzymes, and unlike most it passes through the intestine largely intact, so its concentration in the stool mirrors what the pancreas made. When the pancreas is damaged or diseased — for example in chronic pancreatitis, cystic fibrosis, after pancreatic surgery, or with a pancreatic tumour — enzyme output falls, food (especially fat) is not properly digested, and elastase in the stool drops. This is why it is the abnormal LOW value that matters here, unlike most blood tests. The result is graded: a normal level makes significant pancreatic insufficiency unlikely, a moderately low level is borderline, and a very low level points to severe exocrine pancreatic insufficiency. The test is simple and non-invasive, is not affected by taking pancreatic enzyme supplements, and is the usual first step when malabsorption from a pancreatic cause is suspected — often prompted by greasy, foul-smelling stools, weight loss and low fat-soluble vitamins.
What a high value can mean
- A normal or high elastase is reassuring — it makes significant pancreatic enzyme insufficiency unlikely.
- High values are not a concern — for this test it is the low result that signals disease.
What a low value can mean
- Exocrine pancreatic insufficiency — the key abnormal finding; the pancreas is not making enough enzymes.
- Chronic pancreatitis — a common cause of a low elastase.
- Cystic fibrosis — often causes very low levels.
- Pancreatic cancer or after pancreatic surgery.
- A falsely low value with very watery diarrhoea — dilution can lower the reading.
When to discuss with a doctor
Fecal elastase is used when malabsorption from the pancreas is suspected — for example greasy, pale, foul-smelling stools, unexplained weight loss, bloating, or low fat-soluble vitamins — and its distinctive feature is that the LOW result is the abnormal one. A clearly low level supports exocrine pancreatic insufficiency and usually leads to enzyme replacement treatment and a search for the underlying cause (such as chronic pancreatitis), guided by a doctor. A normal level makes a pancreatic cause of the symptoms unlikely and shifts attention elsewhere, such as coeliac disease. A very watery sample can lower the value falsely, so the result is read with the clinical picture. Mediora.AI shows fecal elastase alongside markers of malabsorption (fat-soluble vitamins, B12) so the pancreatic pattern is visible; the interpretation and any treatment belong with your doctor.