Fibroscan score interpretation

[Bravesoul]

So guys I went for a fibroscan a few days ago. I'm 5 foot 7, 59 kg male thus very lean. Though surprisingly, the M probe of the fibroscan couldn't detect any reading from my liver. The doctor failed every time no matter how hard he tried. Eventually, he used the Xl probe instead and it did succeed in taking readings. I got a score of 6.1kpa on the Xl probe. Being a rather skinny male, could it mean this probe might have underestimated the degree of my fibrosis. How would this reading compare to a reading using the M probe given I'm not fat thus XL probe could potentially miscalculate my score. Anyone who can share his opinion on this will be highly appreciated. Thanks