Here’s how they grade them —>

“SUV” stands for “standard uptake value” and is a measure of radiotracer uptake that indicates how high grade the cancer is. The higher the SUVmax, the more advanced the cancer.

So, they use the PSMA SUVmax values of your blood (as the lowest level), liver (as the medium level), and parotid (or lacrimal) glands (as the highest level) of SUVmax expression for comparison.

If a suspicious area (lesion) is expressing PSMA, and it has:
> a PSMA SUV score less than blood, then it’s not likely cancer, but instead just normal, background PSMA cellular expression;

> a PSMA SUV score greater than blood, but lower than liver, then it’s likely low-grade prostate cancer;

> a PSMA SUV score greater than liver, but lower than lacrimal/parotid glands, then it’s likely moderate-grade prostate cancer;

> a PSMA SUV score greater than parotid glands, then it’s likely high-grade prostate cancer.