The vet detected protein in his urine and his PH level was high as well.
この場合、次のような言い方ができますよ。
ーThe vet detected protein in his urine and his PH level was high as well.
「獣医はかれ(ペット)の尿から蛋白と高いPHレベルを検出した」=「尿蛋白とPHプラスが出た」
to detect「検出する」
protein in one's urine「尿蛋白」
one's PH level was high「PHレベルが高かった」
ご参考まで!