HDL value is half the normal is this risky?

Hi,
Welcome to the ehealthforum and I am really glad to help you out.

HDL is the good cholesterol and HDL levels below 40 mg/dL result in an increased risk of coronary atery disease, even in people whose total cholesterol and LDL cholesterol levels are normal.

For increasing the HDL levels, just follow the healthy lifestyle. Avoid sugary foods, oily stuff, increase the green salads, briskly walk at least 45 min daily and stop smoking and alcohol consumption.
Monounsaturated fats such as canola oil, avocado oil, or olive oil and in the fats found in peanut butter can increase HDL cholesterol levels without increasing the total cholesterol. Hence your diet should be rich in these.

It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.