Giu negative

Italian to English Medical Medical (general) Physical examination

Part of a medical report on a patient enrolled in a medical study for heart problems.
Part of the text describes a standard physical examination - appearance of the skin, heart sounds, some edema to the lower limbs.

"Addome trattabile. Fegato all'arco. Giu negative 30°. PA XXX/YY mmHg. ECG:..."

I realise this is probably straightforward, but I can't work out what "Giu negative" stands for here. The report is typed, not handwritten, so this is very clearly what has been written by the physician.

Any enlightenment greatly appreciated!