Non Hep C study arm has been completed, Hep C study arm has not been completed.

The objective of this study is to assess the prevalence of vitamin D deficiency in patients with chronic Hepatitis C compared to a matched control group of healthy individuals in the Sioux Falls area. It is the hypothesis of this study that vitamin D deficiency is more common in patients with chronic Hepatitis C compared to the healthy control group.

In this study, we will measure vitamin D levels in patients with chronic Hepatitis C and healthy individuals. This study will be important to assess vitamin D inadequacy in patients with chronic Hepatitis C and healthy individuals in this area.

Inclusion Criteria for Study Group:

• Men and women between the ages of 25 and 55
• Diagnosis of chronic hepatitis C

Exclusion Criteria for Study Group:

• Taking a vitamin D supplement (by itself or as part of a multivitamin), a calcium supplement and/or biphosphonates
• Has acute hepatitis C infection
• Has chronic hepatitis B infection
• Had gastric bypass surgery
• Has chronic kidney disease

Inclusion Criteria for Control Group:

• Men and women between the ages of 20 and 60
• Has a body mass index (BMI) between 20 and 35

Exclusion Criteria for Study Group:

• Taking a vitamin D supplement (by itself or as part of a multivitamin), a calcium supplement and/or biphosphonates
• Has any significant illness or medical problem that is not under control or being controlled by medication
• History of hepatitis or abnormal liver chemistry tests
• History of intravenous drug use

This is a comparison study between two different populations: a study group and a control group. The study group will consist of fifty individuals with a diagnosis of chronic Hepatitis C. The control group will consist of fifty individuals who are considered to be generally healthy.