20 percent change in vitamin D levels of critically ill during a 24 hour period – Oct 2011

Do random estimations of vitamin D3 and parathyroid hormone reflect the 24-h profile in the critically ill?

Intensive Care Medicine
Volume 38, Number 1, 177-179, DOI: 10.1007/s00134-011-2415-x
Correspondence

Bala Venkatesh, Ben Davidson, Katherine Robinson, Ranald Pascoe, Charles Appleton and Mark Jones
These were people expected to be in the ICU for more than 24 hours.
Author feels that a single vitamin D test is not appropriate.

Note: 50 nmol = 20 ng; 100 nmol = 40 ng

- - - - - - - - - - - - - - - - - - - - - - - -

See also VitaminDWiki

• All items in Vitamin D Test 160 items
• Vitamin D test results vary as much as 30 ng between test labs – Jan 2012
• Vitamin D tests had poor agreement – yet again – April 2011
• Panel Discussion on Vitamin D and Tests - 2011
• Vitamin D measurements of individuals vary by 3 ng within 6 days – June 2011
• Vitamin D blood testing within plus or minus 7 percent – Mar 2010 variation between labs
• Comparison of vitamin D blood tests – worse case off by 15% – Aug 2010 variation between labs
• Day to Day blood test variation less than 8 percent - Aug 2010