Normally, the normal range of urinary creatinine is 7-18 mmol/d in adult males and 5.3-16 mmol/d in females, 7000-18000 μmol/24h in adult males and 5300-16000 μmol/24h in adult females. Urinary creatinine mainly comes from the blood, filtered by the glomerulus and then excreted in the urine, the renal tubules are basically not absorbed and rarely excreted. Increased urinary creatinine is commonly seen after starvation, heavy meat consumption, strenuous exercise, diabetes mellitus, acromegaly, gigantism, hypothyroidism, and infections. Its decrease is common in acute kidney injury or chronic renal insufficiency, hyperthyroidism, severe congestive heart failure, myotonic dystrophy, leukemia, anemia, and long-term vegetarians. If you find that the patient’s urine creatinine is abnormal, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions to improve the relevant examination to clarify the condition, if necessary, feasible standardized treatment, so as to avoid delaying the condition.