Urine black acid qualitative test

Melanin is a macromolecular compound synthesized by tyrosine via 3,4-dihydroxyphenylalanine (ie, dopa) and erythromycin. It is a brown to black pigment and its precursor is a colorless melanogen. When the tyrosinase in melanocytes is congenitally deficient, albinism can form. Tumors formed by melanocytes are called melanoma. Normal urine does not contain melanin, so the qualitative test is negative. There are a lot of tyrosinase in melanoma, so melanin can appear in the urine of patients with melanoma. The eye is a good site for melanoma. Hepatic metastatic melanoma patients often have a large amount of melanin in the urine, which can be used as an important basis for the diagnosis of the disease. In addition, melanin is present in the urine of patients with chronic malaria and adrenal insufficiency (Addison's disease). Basic Information Specialist classification: growth and development check classification: urine / kidney function test Applicable gender: whether men and women apply fasting: fasting Tips: Do not exercise vigorously, maintain a good diet and work. The middle part of the urine is taken for inspection. Women in the menstrual period are not suitable for this examination. Normal value negative. Clinical significance Positive: melanoma, liver metastatic melanoma, chronic malaria, primary adrenal insufficiency (Addison's disease). Positive results may be diseases: melanoma, primary adrenal insufficiency, malaria considerations Before the test: Do not exercise vigorously, maintain a good diet and rest. At the time of examination: a part of the urine is discharged first to wash away the bacteria remaining in the urethra and the anterior urethra, and then the middle part of the urine is taken for inspection. Not suitable for the crowd: women in the menstrual period. Inspection process The urine of the subject was collected and examined by microscopy. Not suitable for the crowd Women in the menstrual period. Adverse reactions and risks No.