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Characterization of Hyperparathyroidism and Vitamin D Deficiency in Obesity

NCT00288873 · Status: COMPLETED · Phase: PHASE4 · Type: INTERVENTIONAL · Enrollment: 60

Last updated 2018-12-20

No results posted yet for this study

Summary

Obese persons are known to have elevated levels of parathyroid hormone (PTH) and low levels of vitamin D. These hormones are important in regulation of the body's calcium stores and bone health. We would like to investigate these abnormalities and the accuracy of our current diagnostic tests by comparing results of standard assays for vitamin D and PTH to more specific tests, in obese subjects at baseline and as vitamin D is replaced. We will also compare two standard vitamin D replacement regimens to determine if one is more effective.

This is a pilot study with two parts: Part 1 will compare levels of PTH and vitamin D using two different assays in obese subjects who have normal vitamin D and those who do not. We plan to enroll 20 subjects who have normal vitamin D levels and 40 subjects who have vitamin D insufficiency. All subjects will fill out questionnaires about the amount of calcium and vitamin D in their diet, and their recent sunlight exposure. We will ask for blood samples so that we can measure levels of calcium, vitamin D, albumin, creatinine, glucose, insulin and the different forms of PTH.

Subjects who have vitamin D insufficiency will then be randomized to receive Vitamin D2 or Vitamin D3 in standard doses for eight weeks, in an open label trial. At four and eight weeks, these subjects will fill out the above questionnaires and have the blood tests repeated. For safety purposes, urine calcium will also be monitored.

Conditions

  • Vitamin D Deficiency
  • Secondary Hyperparathyroidism
  • Obesity

Interventions

DRUG

Ergocalciferol

DRUG

Cholecalciferol

Sponsors & Collaborators

  • Weill Medical College of Cornell University

    lead OTHER

Principal Investigators

  • Emily M Stein, M.D. · Weill Medical College of Cornell University

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Model
PARALLEL

Eligibility

Min Age
18 Years
Max Age
65 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2006-02-28
Primary Completion
2007-07-31
Completion
2007-07-31

Countries

  • United States

Study Locations

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Entities

Diseases

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT00288873 on ClinicalTrials.gov