The study is a survey to answer the specific question, "What is the prevalence of metabolic syndrome in maintenance hemodialysis patients?" Metabolic syndrome is a cluster of conditions that increase an individual's risk for developing cardiovascular disease and diabetes.

Risk factors for metabolic syndrome will be collected for each consented patient. They include elevated serum triglycerides, reduced HDL cholesterol, hypertension, elevated fasting blood sugar concentration and abdominal obesity. The investigator will measure waist circumference of each consented patient in a secure area according to standardized procedures. The other data is available from the patient's medical record.

Inclusion Criteria:

• Patients undergoing maintenance hemodialysis equal to or greater than 3 months
• Patient at lest 18 years of age
• Availability of all data in the medical record for classification of the metabolic syndrome, including serum triglycerides, serum HDL-cholesterol, systolic BP and diastolic BP, and serum glucose

Exclusion Criteria:

• Patients unwilling or unable to give informed consent to participate
• Patients with a history of thyroid disease
• Patients unable to stand upright

All study subjects are on maintenance hemodialysis