Fat,(Fecal Lipids)Qn, Stool

Panels that include this biomarker

• Fecal Fat, Quantitative 001354

  2 analytes · Stool · Fasting not stated · Turnaround 4 - 7 days

  Method and collection

  Method

  Extraction/spectrophotometry

  Preparation

  Adult patients should be on a standard diet containing 50 to 150 g of fat per day for at least three days before test is started and during the 72-hour collection. In children, the amount of fat in the diet should be constant for one day before the test and during the test. The patient should not have had mineral oil as a laxative prior to specimen collection.

  Collection

  Collect stool directly into can. Do not fill any can more than 2/3 full. Secure lid with pressure and firmly attach the O-ring. State collection time on the can label. Place the can and the absorbent sheet into the leakproof plastic bag and seal. Send the entire can, or if submitting aliquot , follow this procedure: 1. Weigh specimen and collection container and subtract the weight of an empty container of same type (one-gallon can weight with lid: 360 g metal or 320 g plastic container). This is the “net weight” to be recorded on the test request form. 2. Open the container and observe whether the contents are liquid. If liquid stool , secure the lid, mix, and submit an aliquot of the total collection. If solid stool , add deionized water (approximately 500 mL) to the specimen container and mix thoroughly to create a homogenous specimen. Submit a 5 to 25 mL aliquot of the total collection in an empty stool transport vial (LabCorp N° 59517) or screw-cap urine bottle (LabCorp N° 20648), sterile no additives. 3. Record on both the container and the test request form the amount of water added to liquefy the stool or if no water was required.

  Reference notes

  • 0 to 18 years: 0.0-3.1 g/24 hours • >18 years: 0.0−7.1 g/24 hours

  Labcorp catalog page

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Panels that include this biomarker

• Fecal Fat, Total, Quantitative 455

  3 analytes · Stool · Fasting not stated · Turnaround Set up: Tues-Fri (a.m.); Report available: 2 days

  Method and collection

  Method

  Nuclear Magnetic Resonance (NMR)

  Preparation

  ⁠⁠⁠⁠⁠⁠⁠Patient should be on a diet including 100 grams of fat per day for 3 days prior to collection and during collection period.

  Collection

  Send entire collection sample - Use a 1 gallon plastic, leak-proof, screw-cap container (Warehouse item #2614). Record total collection time (24, 48, or 72 hours) and weight on test requisition. If entire collection is sent to the lab, the lab will verify weight of sample. Keep refrigerated during collection. ⁠⁠⁠⁠⁠⁠⁠Do not submit specimen in metal paint cans, as processing poses a safety hazard. Specimens received in paint cans will be rejected.

  Reference notes

  <7.0 g/24 h

  Quest Diagnostics catalog page

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