[Recent studies have shown that adequate vitamin D level is essential in the maintenance of normal immunological status and presumably, it has a remarkable role even in the healing of some diseases. Vitamin D deficiency is a common phenomenon worldwide. Presently, the accepted marker of vitamin-D status is the total-25-hydroxy- D-vitamin [t-25(OH)D], its level depends on the specific (DBP) and aspecific (albumin) binding proteins. As known, the level of binding proteins may change in the hospitalised patients therefore, the presently used marker could not be reliable for the vitamin status in these cases. Our aim was to measure the D-vitamin supply among hospitalized patients, taking into account the level of binding proteins. METHODS - 401 cases (average age 70±14 years) were sorted from Internal Medicine (IM; 68), Intensiv Care Unit (ICU; 58), Traumatology (203 patients suffered hip fracture) and Dialysis Center (72 patients with end stage renal disease). 127 age and sex matched persons with active lifestyle served as control group. We determined t-25(OH)D, DBP, parathormon (PTHi), albumin and the albumin corrected Ca level. The bioavailable and free vitamin fractions and the free index were calculated. RESULTS - Based on the measured t- 25(OH)D, patients have more frequently suboptimal D-vitamin levels, compared to the control group (66% vs. 97%). Severe Dvitamin deficiency occured nearly 8 times more likely (6% vs. 47%) in the hospitalized patients. Chronic renal failure and malignant diseases seem to be significantly negative influencing factors in the metabolism of the vitamin D. The level of DBP, albumin, t-25(OH)D, Bio-25(OH)D was significantly lower in the patients who died. CONCLUSION - In most cases, t-25(OH)D levels show similar results about the vitamin- D supply than other calculated 25(OH)D fraction ,except for the patients of ICU and IM . The t-25(OH)D, the Bio- 25(OH)D, the DBP and the albumin levels seem to be a good prognostic marker of the outcome.]
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