What sample is required?
The determination is made from a venous blood sample.
Is some kind of prior preparation necessary?
For this test you do not need any special preparation.
Why do the analysis?
To detect, diagnose and/or follow the evolution of a hepatitis B virus (HBV) infection; to determine if the hepatitis B vaccine has produced the appropriate degree of immunity; sometimes, as a guide to treatment and to evaluate its effectiveness.
When to do the analysis?
When there are elevated concentrations of homocysteine; on some occasions when a close relative has a MTHFR gene mutation or has developed premature CVD or thrombosis at a young age.