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Total Fecal Fat, Qualitative — Microscopy

Published: August 9, 2026Updated: August 17, 2026

A stool test that checks for excess fat using a qualitative method and microscopic examination.

Quick summary

["A positive result may indicate that fat is not being absorbed normally."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
96734-9
Short code
FA salts Stl Ql Micro
Synonyms
FA salts Stl Ql Micro
Category
liver
Sample
stool
Container
Clean container
Units
N/A
Ref low
7
Ref high
56
Critical range
— – 500 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microscopy-light
CPT
84484
SNOMED
302773008
Specimen volume
5 g
Stability
Refrigerated: 24h, Frozen: 7d
TAT
4–24 hours
Order
routine

What is this test?

This test examines a stool sample for the presence of fat. It is used to help evaluate symptoms such as greasy, foul-smelling stools, diarrhea, or weight loss.

Why might I need this test?

A clinician may order this test if they suspect fat malabsorption or another digestive problem. It can provide supporting information when evaluating conditions involving the pancreas, bile ducts, liver, or intestines.

How is the test performed?

A small amount of stool is prepared and examined under a microscope to look for fat. The result is reported as present or absent rather than as a specific measurement.

How do I prepare for the test?

Collect the stool sample using the container and instructions provided by the laboratory. Do not fast or change your diet unless your healthcare professional specifically instructs you to do so.

Reference range

Adult males: 7-56 U/L; Adult females: 7-43 U/LN/A

Specimen: stool

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Detecting excess fat in stool may be a sign of fat malabsorption, sometimes called steatorrhea. Possible causes include pancreatic problems, reduced bile production or flow, intestinal disease, or certain medications. The result must be interpreted with symptoms, medical history, and other tests because it does not identify the cause by itself.

Short name

Qualitative fecal fat

Frequently asked questions

What does a positive fecal fat result mean?
It means fat was detected in the stool, which may occur with fat malabsorption. Your clinician will interpret the finding alongside your symptoms and other test results.
Is this the same as a fecal fat measurement with a number?
No. This is a qualitative test, so it indicates whether fat is present rather than reporting a measured amount.
Can I take medicines or change my diet before the test?
Follow your clinician's instructions. Some medicines or dietary changes may affect the result, but do not stop prescribed treatment unless instructed to do so.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 17, 2026. · Read our editorial policy