Test to Diagnose Vitamin D Deficiency

 

 

Find out if you are low in Vitamin D?

 

 

You may or may not have any symptoms due to Vitamin D deficiency. The best approach is to get your vitamin D level checked. It's a simple blood test. However, it's very important to get the correct test for Vitamin D.

 

There are two tests for vitamin D level:          

 

25 OH Vitamin D and 1,25 OH Vitamin D.

 

25 OH Vitamin D (and NOT the 1,25 OH  Vitamin D) is the correct test for diagnosing Vitamin D deficiency.

 

 

Range of 25 OH Vitamin D level:

 

Another common problem is the normal range provided by the lab that comes with the results. In my experience, most normal ranges provided by the lab are incorrect.

 

A 25 OH vitamin D level less than 30 ng/ml (or 75 nmol/L) is considered low by most endocrinologists.

 

The normal range of 25 OH vitamin D should be 30-100 ng/ml which is equal to 75-250 nmol/L.

 

 

How to Convert Vitamin D level in nmol/L into ng/ml?

 

The conversion factor is 2.5

 

nmol/L divided by 2.5 = ng/ml

 

For example, a 25 OH vitamin D level of 50 nmol/L divided by 2.5 = 20 ng/ml

 

 

Treatment of Vitamin D Deficiency







This article was written by Sarfraz Zaidi, MD, FACE. Dr. Zaidi specializes in Diabetes, photoEndocrinology and Metabolism.

 

 

Dr. Zaidi is a former Assistant Clinical Professor of Medicine at UCLA. Currently he is Medical Director of the Jamila Diabetes and Endocrine Medical Center in Thousand Oaks, California.

 

 

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