Quality Assessment of 25(OH)D, Insulin, Total Cholesterol, Triglycerides, and Potassium in 40-Year-Old Frozen Serum

<div>Comparisons between 25(OH)D levels in frozen serum between 1968-1969 and 1974-1975 from 20 subjects (a), and boxplot of 25(OH)D levels separately for samples collected at the end of the winter and at the end of the summer in 1968-1969 (b).</div>

Epidemiology Research International

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Figure 2

Figure 2: Quality Assessment of 25(OH)D, Insulin, Total Cholesterol, Triglycerides, and Potassium in 40-Year-Old Frozen Serum 