Vitamin D Testing

Quality of the 25-OH Vitamin D Testing

January 2009

This slide shows the data from 2007. The first column shows various methods available for 25-hydroxyvd testing. The next column shows the various number of labs participating in this survey and the number of labs using a particular technology. For example, there are 20 labs using LC-MS method. The mean value obtained by using LC method was 50.8, the standard deviation among labs using LC method was 9.3, leading to the coefficient variation of 18.2.

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Jump to section:

• Introduction
• Objectives
• Rickets
• UVB Light
• Vitamin D Deficiency
• Interaction Between Vitamin D and Calcium
• Vitamin D3
• Vitamin D2
• Various Vitamin D Tests
• History of 25-OH Vitamin D Testing
• Accreditation Agencies for Precision Among Peers
• Quality of the 25-OH Vitamin D Testing
• 25-OH Vitamin D Volume
• Reference Ranges for 25-OH Vitamin D
• Various Vitamin D Tests
• Case Study - Rickets in a Premature Infant
• Birth History
• Ionized Calcium
• Fractures Identified on Routine Radiographic Surveillance for Line Placement
• Vitamin D Supplementation
• Lab Values After Vit-D Supplementation
• Mother's History
• Infant's X-ray
• Mother's Creatinine
• The Connection Between the Mother and the Infant
• Summary
• Questions?