Maybe LMA was a zero? My total coronary calcium score had six components, five of them were zero, but all listed on the final score as 0. After LAD, there was "Diagonals" and after RCA was "PDA for Posterior Descending Artery".

When you speak with the lab, also ask how common it may have been an error in the first test. My understanding is that the Agatston scoring method is a computer generated analysis counting up specks of calcium in so many mm of volume. Like with a mammogram, there may be a risk of missing specks but less risk of counting specks that are not there??

And when you call the lab, ask to speak with the MD who signed and reviewed your exam findings. I have spoken with many over the years, and find most love to talk to real live patients, expounding on the results. They spend their days in darkened rooms checking a computer readout and then signing off on digital scans, so when they have a diagnostic exam patient in front of them, the radiologists tend to talk and talk away (and compare your two scans?)