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The research investigates the manganese levels in the blood, plasma and serum of healthy adult horses in Germany and establishes reference intervals for manganese levels. The study also compares two methods of measuring these levels: atomic absorption spectrometry (AAS) and inductively coupled plasma mass spectrometry (ICP-MS).
The objective of the study was two-fold:
The process involved taking a single blood sample from a total of 270 clinically healthy horses aged 3-25 years on 3 different farms between May 2018 and November 2019. Mn concentrations were analyzed in Lithium-Heparin (LH) whole blood, LH plasma and serum.
The reference intervals were based on the recommendations from the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC) and the Clinical and Laboratory Standards Institute (CLSI) that includes the range between 2.5 and 97.5 percentile of the analyzed Mn concentrations.
Concurrently, the researchers took food samples to determine the Mn content in the corresponding feeding ration.
The study revealed a significantly higher median Mn concentration in whole blood (12.4 μg/l) than in the corresponding serum or LH plasma. The reference intervals differed for each analysis method and each sample type (whole blood, serum, plasma), suggesting that the sample type and the method used for analysis can affect the Mn concentration results.
In comparing methods, AAS and ICP-MS yielded comparable results for whole blood, but significant differences were observed in Mn determinations for LH plasma and serum.
The researchers concluded that whole blood shows an average of 10-fold higher Mn concentrations than serum or LH plasma. When evaluating Mn concentrations in blood, considerations should be made regarding the type of sample material analyzed and the method of analysis used, as significant differences between AAS and ICP-MS results were observed in serum and LH plasma.
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