Hyponatremia the underlying cause of hyponatremia. A blood test demonstrating a serum sodium less than 135 mmol/L is diagnostic for hyponatremia. The history and physical exam are necessary to help determine if the patient is hypovolemic, euvolemic, or hypervolemic, which has important implications in determining the underlying cause. An assessment is also made to determine if the patient is experiencing symptoms from their hyponatremia. These include assessments of alertness, concentration, and orientation. False hyponatremia, also known as spurious, pseudo, hypertonic, or artifactual hyponatremia is when the lab tests read low sodium levels but there is no hypotonicity. In hypertonic hyponatremia, resorption
Department of Defense Serum Repository Department of Defense Serum Repository The Department of Defense Serum Repository (also referred to as the DoD Serum Repository or simply DoDSR) is a biological repository operated by the United States Department of Defense containing over 50,000,000 human serum specimens, collected primarily from applicants to and members of the United States Uniformed Services. The DoDSR is located in Silver Spring, Maryland and is operated by the Armed Forces Health Surveillance Center (AFHSC), a subordinate of the United States Army Center for Health Promotion and Preventive Medicine (USACHPPM), itself evolved from the Johns Hopkins School of Hygiene and Public Health. The