Vitamin B12
Kod:12007|CPT:82607|LOINC:2132-9
| Kabi | Vitamin B12 |
|---|
Tahlil ma'lumotlari
Tadqiqot usuli
- Elektrokimyoluminessent immunoanaliz (ECLIA)
- Kimyoluminessent immunoanaliz (CLIA)
Kutilayotgan natija topshirish vaqti
1 kun
Maxsus tayyorlik
- Do not eat for 2–3 hours before the blood draw; water is allowed.
- Avoid physical exertion and emotional stress for 30 minutes prior to collection.
- Do not smoke during the 30 minutes before collection.
- If using high-dose biotin supplements, stop for at least 72 hours before collection; document and review biotin use prior to testing.
Qanday foydalanish
Vitamin B12 testi (zardob kobalamini, sianokobalamini) makrotsitar yoki megaloblastik anemiyani baholash va kobalamin yetishmovchiligi bilan bog'liq nevrologik yoki neyropsixiatrik belgilarni tekshirish uchun qo'llaniladi. U oziqlanish yetishmovchiligi va malabsorbsiyaning çölyak kasalligi va Kron kasalligi kabi holatlarini baholashni, alkogolizmda baholashni, prenatal parvarish/ovqatlanish holatini ko'rib chiqishni va tasdiqlangan vitamin B12 yetishmovchiligi davolanishini monitoring qilishni qo'llab-quvvatlaydi. Keskin oshgan zardob B12 jigar kasalligi yoki miyeloid leykoz bilan birga kuzatilishi mumkin. Talqin klinik topilmalar va bog'liq tekshiruvlar, jumladan folat, gomotsistein va umumiy qon tahlili ko'rsatkichlari bilan birgalikda olib boriladi.
Cheklovlar
Vitamin B12 ni zardobda o'lchash kobalamin holatini baholashning standart yondashuvidir. Ovqat manbalari asosan hayvonot mahsulotlariga to'g'ri keladi — go'sht (xususan jigar va buyrak), baliq, tuxum va sut mahsulotlari — bundan tashqari ayrim boyitilgan don mahsulotlari ham qo'shimcha manbadir. Kobalamin nuklein kislotalar sintezi, eritropoez va nevrologik yaxlitlikni saqlash uchun zarur; yetishmovchilik megaloblastik anemiyani keltirib chiqaradi va orqa ustunlar hamda kortikospinal yo'llarni jalb qilishi mumkin, distal paresteziyalar va sezgi yo'qolishi bilan namoyon bo'ladi. Yetishmovchilik sabablari quyidagilarni o'z ichiga oladi: yetarli bo'lmagan qabul (masalan, uzoq muddatli qat'iy vegetarian parhezlari yoki ochlik), so'rilishning buzilishi (masalan, intrinsik faktor yetishmovchiligi tufayli pernitsioz anemiya, çölyak kasalligi, Kron kasalligi, axlorhidriya yoki operatsiyadan keyingi so'rilish yuzasining kamayishi), jigar yoki buyrak kasalliklarida va alkogol suiiste'molida foydalanilishning kamayishi, shuningdek ehtiyojning oshishi (masalan, gemolitik anemiya, gipertireoz, alfa-talasemiya).
| O'lchov birligi | pg/mL | ||||
|---|---|---|---|---|---|
| Referens oraliq |
| ||||
| Ko'rsatmalar | Macrocytosis or an increased mean corpuscular volume on CBC., Cognitive or behavioral changes such as confusion, depression, paranoia, or other neuropsychiatric symptoms, especially in older adults., Clinical suspicion of cobalamin deficiency with systemic or gastrointestinal findings (eg, fatigue, glossitis, hepatomegaly)., Peripheral neuropathy with paresthesias, numbness, or sensory loss., Workup of malnutrition or possible malabsorption, including celiac disease or Crohn disease., Maternal testing when a breastfed infant is found to be vitamin B12 deficient., Follow-up to track response to therapy in documented vitamin B12 deficiency. |
Natija og'ishlarining mumkin sabablari
Oshgan daraja
- biotin supplementation (high-dose)
- folic acid therapy in concurrent folate and vitamin B12 deficiency
- liver disease
- myeloid leukemia
- vitamin B12 therapy
Pasaygan daraja
- alcohol abuse
- antibiotics
- anticonvulsants
- colchicine
- oral contraceptives
- vegetarian or vegan diet
Namunangiz talablari
| Namunangiz | Zardob |
|---|---|
| Container | Oltin/yo'lbars qopqoqli probirka (SST, gel ajratgich) |
| Hajm | 1 mL (min 0.7 mL) |
| Saqlash tayyorlik | Xona harorati, Sovutilgan, Muzlatilgan |