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"Variable Name","Variable ID","Variable Description",Version,"dbGaP Mapping" PX051401_Sodium_Container,PX051401010000,"Was the specimen collection container prescreened for traces of sodium contamination?",0,https://www.phenxtoolkit.org/protocols/view/51401 PX051401_Sodium_Urinary_Sodium_Concentration,PX051401050000,"Urinary sodium Concentration from bioassay",0,https://www.phenxtoolkit.org/protocols/view/51401 PX051401_Sodium_UrineSpecimen_Age,PX051401040000,"What is the creatinine content as determined through the Creatinine (urinary) Jaffe kinetic method?",0,https://www.phenxtoolkit.org/protocols/view/51401 PX051401_Sodium_UrineSpecimen_QualityControl,PX051401020000,"Did the patient take a PABA pill at least three days prior to urine collection?",0,https://www.phenxtoolkit.org/protocols/view/51401 PX051401_Sodium_UrineSpecimen_Storage,PX051401030000,"What is the sodium and potassium content in the urine as determined through Ion Selective Electrode?",0,https://www.phenxtoolkit.org/protocols/view/51401