title: Plasma free fatty acid reference interval in South African neonates in the first week of life.
abstract: BACKGROUND
  Non-esterified fatty acid (NEFA) levels are an important diagnostic tool in the investigation of neonatal hypoglycaemia. NEFA reference intervals have not been reported for neonates previously.
  
  
  METHODS
  The objective of this study was to determine an NEFA reference interval for neonates.
  
  
  RESULTS
  Heparinized plasma obtained from 106 healthy neonates in the first week of life was analysed using the Roche "Free fatty acid, Half-micro test" kit. Results were then analysed statistically for normality (Shapiro-Wilk test) and reference interval determined non-parametrically (bootstrap method).
  
  
  CONCLUSIONS
  NEFA levels displayed a non-Gaussian distribution and the reference interval (2.5th and 97.5th percentiles) was 0.2-1.5 mmol/L (90% confidence intervals 0.1-0.3 and 1.4-2.0 mmol/L, respectively). The NEFA reference interval in South African neonates less than a week old is similar to that described in infants (1-12 months), indicating that this reference range can be used over the entire neonatal period.
authors.affiliation: Department of Clinical Laboratory Sciences, Division of Chemical Pathology, University of Cape Town and National Health Laboratory Service, Groote Schuur & Red Cross Children's Hospital, Cape Town, South Africa.
authors.forename: F
authors.initials: F
authors.lastname: Omar
authors.forename: G
authors.initials: G
authors.lastname: van der Watt
authors.forename: V
authors.initials: V
authors.lastname: November
authors.forename: T S
authors.initials: TS
authors.lastname: Pillay
mesh_terms: D005230:Fatty Acids, Nonesterified / Q000097:blood* / Q000592:standards*; D006801:Humans; D007231:Infant, Newborn / Q000097:blood*; D016011:Normal Distribution; D012016:Reference Values; D013019:South Africa
chemical_list: D005230:Fatty Acids, Nonesterified