Pediatric brain natriuretic peptide and N-terminal pro-brain natriuretic peptide reference intervals.
BACKGROUND
Brain natriuretic peptide (BNP) and N-terminal pro-brain natriuretic peptide (NT-proBNP) have been shown to be useful biomarkers for the diagnosis of heart failure. Pediatric reference intervals for these analytes have been reported in part. Previous studies lack large numbers in each group, have not covered all age ranges and have not compared results for BNP with NT-proBNP in simultaneously drawn samples.


METHODS
We measured BNP in whole blood using the Biosite Triage point-of-care method and plasma NT-proBNP using the Dade RxL Dimension. We assessed between and within-day precision of both methods and after removing outliers employed the Hoffmann approach to calculate pediatric reference intervals over the age range of 0-21 y. We also compared the 2 methods on simultaneously drawn samples.


RESULTS
Reference intervals revealed approximately 20-fold higher 97.5th percentiles for neonates than for children >3 y of age. 97.5th percentiles decreased significantly over the first 3 years of life. As shown by others, the CVs for the automated Dade RxL platform were somewhat lower than those for the POCT method. BNP and NT-proBNP correlated well in simultaneously drawn samples (r=0.947).


CONCLUSIONS
Reference intervals for BNP and NT-proBNP are far higher in neonates and infants than in children older than three years of age. The reasons for this are unknown but resemble the elevated CK-MBs and troponins also found in neonates, although the 97.5th percentiles for these latter 2 cardiac markers decrease more rapidly to values found in older children by 6 months of age.
Soldin
Steven J
SJ
Departments of Medicine and Pharmacology, Georgetown University Medical Center, Washington DC 20007, USA. sjs44@georgetown.edu
Soldin
Offie P
OP
Boyajian
Alanna J
AJ
Taskier
Madeline S
MS
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation / Q000379:methods; D002648:Child; D002675:Child, Preschool; D052279:Creatine Kinase, MB Form / Q000097:blood; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D020097:Natriuretic Peptide, Brain / Q000097:blood*; D010446:Peptide Fragments / Q000097:blood*; D012016:Reference Values; D015203:Reproducibility of Results; D014336:Troponin / Q000097:blood
D010446:Peptide Fragments; D014336:Troponin; C109794:pro-brain natriuretic peptide (1-76); D020097:Natriuretic Peptide, Brain; D052279:Creatine Kinase, MB Form