It's important to remember that one blood test alone doesn't determine your risk of heart disease and that the most important risk factors for heart disease are smoking, high blood pressure, high cholesterol and diabetes.
A National Diploma is a title that is used to represent a standard of academic or vocational education. The title was first used in the United Kingdom, but has now been adopted by educational systems worldwide.
On the other hand, the Vocational Graduate Diploma is a relatively new but brilliantly conceptualised qualification (identical in level to that of a university graduate diploma) and is at the level of the first year of a two year Master in engineering degree.