To prevent false analysis when Na+ and Cl- are ordered, which precaution is recommended?

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Measuring chloride accurately hinges on avoiding substances that can mimic chloride or disrupt the detection chemistry. To prevent a falsely high chloride result when Na+ and Cl- are ordered, the sample should be free of interfering additives: EDTA, sodium fluoride, and any bromide contamination. EDTA acts as a chelating agent and alters the ionic environment of the sample, which can skew chloride measurements. Fluoride from NaFl introduces ions that can interfere with the assay’s reactions or electrode response. Bromide behaves similarly to chloride in many detection methods, especially with chloride-selective electrodes, and can be read as extra chloride, inflating the result. Keeping these contaminants out reduces the risk of false positives. Using clean, non-EDTA anticoagulants (like some heparinized tubes) helps, but the key point is avoiding these specific interferences.