I did a blood test today because of my heart attack symptoms . (my troponin i hs is 0.9 ng/l )(reference value says) < 2 ng/l mi rule-out. >= 52 ng/l rule-in . in other cases please refer to esc guidline. please someone explain what this test means.

Hs troponin: Your troponins did not show evidence of heart muscle damage. I assume you've experienced chest discomfort, but there are various causes of chest discomfort which are not heart related. Have your EKG's been normal? Have you had a negative treadmill stress test to rule out coronary artery causes (which would be most unlikely in your age group)? These would all be reassuring for you.

Normal: All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Talk to the doctor who ordered the tests. Having said that, your result is normal. Wish you good health!