Fatty Acids, Free (Nonester)

Primary unit: mEq/L
LOINC codes: 15066-4
Tests that measure Fatty Acids, Free (Nonester): Labcorp 1, Quest Diagnostics 1

Ranges

Each lab publishes a reference range for the population groups it tests, usually the middle 95% of results. These intervals describe that population, not an optimal or healthy target. How ranges differ

Quest Diagnostics, Nonesterified Fatty Acids (Free Fatty Acids) 449

Population	Interval
Newborns	<2.3 mmol/L
1-12 Months	0.50-1.60 mmol/L
1-7 Years	0.60-1.50 mmol/L
8-17 Years	0.20-1.10 mmol/L
Adults	0.07-0.88 mmol/L

Quest Diagnostics test catalog, 449

Tests

Check the catalog code, specimen, method and preparation for every test that measures Fatty Acids, Free (Nonester). Select up to five tests to compare them side by side.

Labcorp 1 test

Single-analyte tests

Fatty Acids, Free (Nonester) 081893
Serum · Fasting not stated · Turnaround 3 - 6 days
Method and collection
Method
Spectrophotometry
Preparation
Sample should be collected in the early morning after a 12-hour fast. Blood for the NEFA procedure should be collected after an overnight fast because the level of circulating nonesterified fatty acids is strongly influenced by food ingestion. If the patient has not properly fasted, the determined level of NEFA will be elevated and not directly comparable to a normal range derived from fasting normal controls.
Collection
After clotting, separate serum and freeze immediately following centrifugation. Serum is the specimen of choice. Heparin must not be used nor should the patient be on heparin therapy. The NEFA level in serum will increase as it remains at room temperature. Transfer specimen to a plastic transport tube before freezing. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.
Reference notes
See table. Age Male (mEq/L) Female (mEq/L) 0 to 30 d 0.0−0.8 0.0−0.8 1 to 6 m 0.0−0.9 0.0−1.1 7 m to 1 y 0.1−2.2 0.2−1.9 2 to 5 y 0.2−2.3 0.1−2.8 6 to 12 y 0.0−1.2 0.0−1.2 13 to 30 y 0.0−0.8 0.0−1.0 31 to 70 y 0.1−0.9 0.1−1.1 71 to 80 y 0.2−0.7 0.1−1.1 >80 y 0.1−0.9 0.1−0.9
Labcorp catalog page

Quest Diagnostics 1 test

Single-analyte tests

Nonesterified Fatty Acids (Free Fatty Acids) 449
Serum · Fasting not stated · Turnaround Set up: Mon, Wed, Fri (a.m.); Report available: 3 days
Method and collection
Method
Spectrophotometry (SP) • Enzymatic
Preparation
Overnight fasting is preferred
Collection
Serum or plasma should be removed from cells immediately after collection
Quest Diagnostics catalog page

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Sources

Labcorp test catalog
1 test: codes, specimens, methods, preparation and reference intervals.
Quest Diagnostics test catalog
1 test: codes, specimens, methods, preparation and reference intervals.
LOINC 15066-4
Regenstrief Institute codes that identify the same result across labs.
Search ClinicalTrials.gov for Fatty Acids, Free (Nonester)
Registered studies that measure Fatty Acids, Free (Nonester), on the U.S. National Library of Medicine registry.

Verify these ranges and sources

We compile this page from named laboratory catalogs, guidelines and studies. Labs calculate reference intervals from the people they test, for one assay method and one population group, so an interval describes that population rather than an optimal target.

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