Creatinine reference values in ELBW infants: Impact of quantification by Jaffe or enzymatic method

Karel Allegaert*, Maike Kuppens, Djalila Mekahli, Elena Levtchenko, Florent Vanstapel, Christine Vanhole, John N. Van Den Anker

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

37 Citations (Scopus)

Abstract

Objective:

Serum creatinine (Scr) reflects to a certain extent glomerular filtration rate in neonates, but postnatal observations also depends on the technique used to quantify Scr (Jaffe colorimetry or enzymatic quantification). 

Methods:

In an attempt to quantify differences between these techniques, we compared postnatal Scr trends in two consecutive cohorts of extremely low birth-weight (ELBW) neonates before and following a switch from uncompensated Jaffe to enzymatic Scr quantification. Postnatal Scr (Days 1, 2, 3, 4, 5, 6, 7, 8, 9, 14, 21, 28, and 42) in 151 ELBW neonates (uncompensated Jaffe) was compared to 116 more recently admitted ELBW neonates (enzymatic). 

Results: 

Although clinical characteristics were similar between both cohorts, median postnatal Jaffe Scr values were significantly higher compared to enzymatic quantification (all days, at least p < 0.001) throughout postnatal life. While both cohorts displayed a similar trend with an initial increase with a Scr peak on Days 3 and 4 and a subsequent decrease, the difference in within-day median values fluctuated between 11 and 24 mmol.L-1. There is neither fixed nor relative difference in Scr between both techniques. 

Conclusions: 

When using Scr to estimate renal function in ELBW neonates, clinicians should in addition to the postnatal changes and other covariates of renal function, also consider the technique applied. We provide reference values and comparison between both techniques.

Original languageEnglish
Pages (from-to)1678-1681
Number of pages4
JournalJournal of Maternal-Fetal and Neonatal Medicine
Volume25
Issue number9
DOIs
Publication statusPublished - Sept 2012

Bibliographical note

Funding Information:
Elena Levtchenko and Karel Allegaert are supported by the Fund for Scientific Research, Flanders (Belgium) (F.W.O. Vlaanderen) by a Fundamental Clinical Investigatorship (1801110N and 1800209N).

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