The fat that a normal person expels from the feces every day accounts for 10% to 15% of the amount of dry feces. It contains bound fatty acids (5% to 15%), free fatty acids (5% to 13%), and neutral fats (1% to 5%). The fat content of normal infants is 50% higher than that of adult feces, and the fat content of children's feces is also 30% higher, and it is mainly neutral fat.

Basic Information

Specialist classification: Digestive examination classification: feces / parasitic examination

Applicable gender: whether men and women apply fasting: not fasting

Tips: Common methods for checking stool fat are microscopic examination, weighing method and titration method. Patients who need to be prepared for quantification are recommended to perform fat quantification tests. Normal value

Fat droplets <6 (high power field).

Clinical significance

Abnormal results:

Neutral fat is a bright round globule of varying size under the microscope. Increased fat excretion in the stool of patients with diarrhea, more than 6 fat drops/HP under the microscope. When fat digestion is poorly absorbed, fat droplets in the feces are greatly increased.

In obstructive jaundice, a large amount of fatty acids appear in the feces due to a lack of bile in the intestine and a fat malabsorption. When pancreatic juice secretion is incomplete, resulting in digestive dysfunction, a large amount of neutral fat (fatty diarrhea) can appear in the feces.

Need to check the crowd:

Patients with symptoms of jaundice, patients with long-term diarrhea and abdominal pain.

High results may be diseases: pediatric celiac disease, pediatric fat malabsorption

Pre-inspection requirements:

1. Please avoid digging the part of the toilet urine and tap water when collecting; do not place the feces directly on toilet paper or paper towel.

2. To avoid interference with the test results, do not use cotton swabs to dig.

3, the amount of feces collected should not be too small (3 ~ 5 grams) to avoid not enough samples for inspection.

Note when checking:

1. Because infants and young children are not easy to get enough samples at one time, if they need to be collected separately, please temporarily store the samples in the refrigerator to avoid bacterial growth.

2, commonly used fecal fat examination methods are microscopic examination, weighing method and titration method. Patients who need to be prepared for quantification are recommended to perform fat quantification tests.

Inspection process

1. Common methods for checking stool fat are microscopic examination, weighing method and titration method.

2, microscopy is simple and easy, but the accuracy is low, can only be used as a screening test, can not be used as a basis for diagnosis; weighing method and titration method is a quantitative method, but it represents total fatty acids, does not contain neutral fat Part of the glycerin. Fat absorption can also be calculated using fat quantification to estimate digestion and absorption.

3, fat absorption rate = 100% / total dietary fat.

4. Reference value: Adult or child: 95%.

5, clinical significance: fat determination mainly understand the body's digestion or absorption function, indirectly provide a basis for the diagnosis of digestive tract diseases. If the total amount of fat in the feces of 24h exceeds 6g, it is called steatorrhea.

Not suitable for the crowd

No taboos.

Adverse reactions and risks

This test will not cause harm to the human body.