25(OH)D düşüklüğünün (D vitamini eksikliği) bazı nedenleri: Yetersiz güneş ışığına maruz kalma. Beslenme yetersizlikleri. Emilim sorunları ve bağırsak hastalıkları. Obezite. Kronik hastalıklar. Koyu ten rengi.
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şunlardır:**\n\n* **25(OH)D (Kalsifediol)** [```1```](https://www.grassrootshealth.net/blog/understanding-forms-vitamin-d-vitamin-d3-25ohd-125oh2d/)[```3```](https://www.fitekran.com/d-vitamini-rehberi-nedir-ne-ise-yarar/).\n * **Üretim Yeri**: Karaciğerde üretilir [```1```](https://www.grassrootshealth.net/blog/understanding-forms-vitamin-d-vitamin-d3-25ohd-125oh2d/)[```3```](https://www.fitekran.com/d-vitamini-rehberi-nedir-ne-ise-yarar/).\n * **İşlev**: Vücutta D vitamininin depo halini oluşturur [```3```](https://www.fitekran.com/d-vitamini-rehberi-nedir-ne-ise-yarar/).\n * **Hormon Durumu**: Hormon değildir [```1```](https://www.grassrootshealth.net/blog/understanding-forms-vitamin-d-vitamin-d3-25ohd-125oh2d/).\n * **Ölçüm**: D vitamini durumunu değerlendirmek için ölçülür [```2```](https://www.immunoshop.com/post/2017/12/17/difference-between-125-oh-vitamin-d-and-25oh-vitamin-d-clinical-utilities)[```5```](https://www.endocrine-abstracts.org/ea/0020/ea0020me11).\n\n* **1,25(OH)2D (Kalsitriol)** [```1```](https://www.grassrootshealth.net/blog/understanding-forms-vitamin-d-vitamin-d3-25ohd-125oh2d/)[```3```](https://www.fitekran.com/d-vitamini-rehberi-nedir-ne-ise-yarar/).\n * **Üretim Yeri**: Böbreklerde üretilir [```1```](https://www.grassrootshealth.net/blog/understanding-forms-vitamin-d-vitamin-d3-25ohd-125oh2d/)[```3```](https://www.fitekran.com/d-vitamini-rehberi-nedir-ne-ise-yarar/).\n * **İşlev**: Aktif hormon formudur ve kalsiyum emilimini artırır [```2```](https://www.immunoshop.com/post/2017/12/17/difference-between-125-oh-vitamin-d-and-25oh-vitamin-d-clinical-utilities)[```3```](https://www.fitekran.com/d-vitamini-rehberi-nedir-ne-ise-yarar/).\n * **Hormon Durumu**: Hormon olarak kabul edilir [```1```](https://www.grassrootshealth.net/blog/understanding-forms-vitamin-d-vitamin-d3-25ohd-125oh2d/).\n * **Ölçüm**: Genellikle rutin olarak ölçülmez, belirli metabolik bozukluklarda gereklidir [```4```](https://www.sabah.com.tr/yasam/d-vitamini-kan-tahlilindeki-adi-nedir-kan-tahlilinde-d-vitamini-simgesi-nedir-rs1-7099103)[```5```](https://www.endocrine-abstracts.org/ea/0020/ea0020me11).\n\n**Özetle**, 25(OH)D daha çok D vitamini depolarını yansıtırken, 1,25(OH)2D aktif hormon formudur ve vücuttaki metabolik süreçleri düzenler [```2```](https://www.immunoshop.com/post/2017/12/17/difference-between-125-oh-vitamin-d-and-25oh-vitamin-d-clinical-utilities)[```4```](https://www.sabah.com.tr/yasam/d-vitamini-kan-tahlilindeki-adi-nedir-kan-tahlilinde-d-vitamini-simgesi-nedir-rs1-7099103).","sources":[{"sourceId":1,"url":"https://www.sabah.com.tr/yasam/d-vitamini-kan-tahlilindeki-adi-nedir-kan-tahlilinde-d-vitamini-simgesi-nedir-rs1-7099103","title":"Sabah: D Vitamini Kan Tahlilindeki Adı Nedir? 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