Gülsüm KADIOĞLU ŞİMŞEK, Fuat Emre CANPOLAT, Hayriye Gözde KANMAZ KUTMAN, Mehmet BÜYÜKTİRYAKİ

Alkaline phosphatase levels of preterm infants under 30 weeks of gestational age and its role in the diagnosis of osteopenia of prematurity

Aim: Alkaline phosphatase is perhaps the most important biochemical marker used in the diagnosis and follow-up of metabolicbone disease or osteopenia of prematurity (OP). The aim of this study was to investigate the percentiles of alkaline phosphatase(ALP) levels in premature infants compared to gestational age and to determine cut-off values for the diagnosis of osteopenia.Material Methods: All ALP results sent to our biochemistry laboratory between 2013-2018 were evaluated retrospectively. Of the total2476 results, 1830 (74%) were found to belong to a separate infant born before 30 weeks of gestation. The results and demographicdata of the patients whose clinical information could be reached were statistically analyzed.Results: The mean birth weight of the infants included in the study was 995 g±254 (450-1500 g) and the mean gestational week wascalculated as 27±1.7 (24-29,6 weeks). The average alkaline phosphatase level was 510±225 U/L [median: 458 IU/L (159-1554)]. Inserum ALP levels; 160.8 IU/L value 5. Percentile, 203 IU/L 10. percentile, 290 U/L 25. percentile 421 IU/L 50. percentile, 583 U/L 75.Percentile, 819 U/L formed 90th percentile and 969 U/L formed 95th percentile. Separate percentiles were also calculated for eachgestational week interval.Conclusion: Although the infants included in the study were hospitalized premature infants, this is the reference range study with thelargest number of patients in our country. Although the data is retrospective, these percentiles may be helpful in the evaluation andthe diagnosis of osteopenia in premature infants.

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