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Is fasting definitely needed for each test?
No, but you must definitely be fasting before if you will have one of the following tests performed. 

Tests requiring fasting:

1,25 – Dihydroxy vitamin D3 
ADH (Vasopressin) 
Alfa-Tocoferole (Vitamin E) 
Alkaline phosphates (ALP) 
Alkaline phosphates isoenzyme 
Beta-crossLaps (Beta-CTx) 
Growth Hormone (GH) 
C-peptide 
Zinc 
Iron 
Total iron binding capacity
Unsaturated iron binding capacity 
Free Fat Acids (FFA) 
Folic Acid 
Phosphor 
Gastrin 
Glucose 
HOMA-IR 
Homocysteine  
Insulin 
Calcitonin 
Cortisol 
Cholesterol, total 
Cholesterol, HDL 
Lactate 
LDL Cholesterol (minimum 12-hours of fasting is required) 
LDL Sub-groups (minimum 12-hours of fasting is required) 
Leptin 
Lipoprotein (a) 
Lipoprotein Electrophoresis 
Parathyroid Hormone (PTH) 
Pyruvate 
Potassium 
Bile Acids 
Triglycerides (minimum 12-hours of fasting is required) 
Vitamin B12
Urea Breath Test

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The information provided on this site is intended for your general knowledge only and is not a substitute for professional medical advice or treatment for specific medical conditions.