4 results
Vitamin D Metabolism
Fat-soluble vitamin
Sources: dermal synthesis and food (dairy products, fish)
Active form: calcitriol (1,25-OH Vitamin D)
Main
pathophysiology #Cholecalciferol
Impact and Challenges With Vitamin D to Treat Secondary Hyperparathyroidism in Patients With Chronic Kidney Disease
Ergocalciferol (D2) Cholecalciferol ... #Pharmacology #Cholecalciferol
Hypercalcemia - Differential Diagnosis Algorithm
Elevated PTH (High or normal):
 • Primary Hyperparathyroidism
 • Familial Hypocalciuric Hypercalcemia
Low
Calcitriol (1,25 OH Cholecalciferol ... ) - ↑ 250H Cholecalciferol ... Intake - ↓ 25OH Cholecalciferol
Light,
UVB, heat
Cholecalciferol vitamin D3
DBP
DBP
Vitamin D
Pool
Liver
7-Dehydro-cholesterol
DBP
→ 25-(OH)D
1 Hydroxyl-apatite
Bone
Fat, bile acids
Chylomicrons
Vitamin D from food
Skin
#Parathyroid
#PTH
secretion
Circulating
25-(OH)D
DBP
Kidney
• 25-(OH)D
1,25-(OH,) D
1,25-(OH)w D
† Ca?+-retention
Metabolite
#Bile
Light, UVB, heat Cholecalciferol