Let’s explore “Vitamin A”

<150 supports deficiency; 150-400 is often treated as borderline and may warrant MMA/homocysteine review.

Fasting and supplement abstention improve interpretability.

Recent supplementation can elevate; very high values may be clinically relevant.

Interpret relative to lipids when appropriate; assay-specific.

Highly preanalytic-sensitive. Fasting, processing, and recent intake matter.

https://danpursermd.substack.com/p/vitamin-a-an-essential-nutrient-its What is Vitamin A good for and where do you get it? These simple questions are answered in my new post. Vitamin A is critical for the prevention of several vision degen

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Did you know that many common health issues are linked to vitamin deficiencies? Discover how Dr. Purser and his expert wellness coaching team can help you identify and address the root causes of your symptoms. Ready to take control of your