Tā bèi zhěnduàn chū gāoxuètáng, xūyào kòngzhì yǐnshí.
He was diagnosed with hyperglycemia and needs to watch his diet.
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高血糖 (hyperglycemia) is a symptom; 糖尿病 (tángniàobìng, diabetes) is the disease. One can have transient 高血糖 after a meal without being diabetic. Pair terms: 低血糖 (dīxuètáng, hypoglycemia), 高血压 (gāoxuèyā, hypertension).