Fatty Acids, Free
Ordering Recommendation
Quantitative Spectrophotometry
Mon, Wed, Fri
1-4 days
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
ARUP Consult®
Disease Topics
Specimen Required
Patient Preparation
Overnight fasting specimen is preferred. 
Serum Separator Tube (SST). Collect on ice. 
Specimen Preparation
Allow serum specimen to clot completely on ice. Serum must be separated from cells and frozen immediately, otherwise lipase continues to break down triglycerides, giving rise to elevated levels of nonesterified (free) fatty acids. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.2 mL) 
Storage/Transport Temperature
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered. 
Unacceptable Conditions
Specimens collected in EDTA, heparin, sodium fluoride/potassium oxalate, sodium citrate, or ammonium oxalate. Non-frozen specimens. 
After separation from cells: Ambient: Unacceptable; Refrigerated: 4 hours; Frozen: 1 month 
Reference Interval
Effective November 17, 2014
0-5 months: less than or equal to 0.73 mmol/L
6 months-1 year: less than or equal to 0.99 mmol/L
2-17 years:  less than or equal to 1.78 mmol/L
18 years or older:  less than or equal to 0.78 mmol/L
Interpretive Data

Component Test Code*Component Chart NameLOINC
0080120Fatty Acids, Free15066-4
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
  • FFA
  • Free Fatty Acids
  • Free Fatty Acids, Serum
  • NEFA
  • Non Esterified Fatty Acids