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Vitamin A Test: What It Is, Why It’s Done, and What the Results Mean Vitamin A is a fat-soluble vitamin essential for vision, immune function, reproduction, and skin health. A Vitamin A test measures the level of this nutrient in your blood to assess deficiency or toxicity, both of which can have serious health consequences.

Alpha lipoproteins are high-density lipoproteins (HDL) – often referred to as the “good cholesterol.” They help transport cholesterol from the arteries to the liver for excretion or re-utilization. Measuring alpha lipoprotein levels is essentially measuring HDL cholesterol, which plays a vital role in cardiovascular health.

Vitamin D Test: Why It Matters and What It Reveals About Your Health