Urine vitamin C

Vitamin C in the human body exists in the form of L-ascorbic acid (reduced ascorbic acid) and L-dehydroascorbic acid (oxidized ascorbic acid). Under normal dietary intake (75-100mg/d), about 50% to 70% of ascorbic acid ingested in the body is catabolized into CO2 and oxalic acid, and the remaining ascorbic acid is excreted in the urine. Basic Information Specialist classification: growth and development check classification: urine / kidney function test Applicable gender: whether men and women apply fasting: not fasting Analysis results: Below normal: Vitamin C deficiency. Normal value: Urine vitamin C: 0.285-0.741mmol/L Above normal: Vitamin C is abundant. negative: Positive: Tips: Try to use fresh morning urine when doing this check. The urine that is randomly selected is preferably mid-stage urine. Menstrual women are not suitable for this examination. Normal value 1. Total vitamin C2,4-dinitrophenylhydrazine method in urine Adult load urine for 4h (500mg oral vitamin C) Less than <0.28mmol/L. Normal 0.285 ~ 0.741mmol / L. Ample > 0.741mmol / L. 2. Urea-reduced vitamin C2,6-dichlorophenol oxime titration Adult load urine for 4h (500mg oral vitamin C) Less than <0.171mmol/L. Normal 0.171 ~ 0.570mmol / L. Ample > 0.570mmol / L. Clinical significance 1. Determination of urinary ascorbic acid does not provide more information than serum determination. The amount of ascorbic acid excretion in the urine fluctuates greatly. It focuses on the intake of ascorbic acid in the diet in the near future. It does not show the stocks in the organization and the nutritional status of the human body. It is generally believed that the determination of ascorbic acid in urine once alone does not indicate whether the body is deficient. However, low levels of ascorbic acid in the urine can further determine the state of vitamin C deficiency. 2. A better method for diagnosing ascorbic acid deficiency is the saturation test. There are many specific methods for the saturation test, and the diagnostic indicators are different. Oral ascorbic acid is generally 500mg, and 50% or more is discharged in 24h urine for good nutritional status. Some people think that after oral administration of ascorbic acid 500mg, the ascorbic acid concentration in urine is "saturated" after 10~6h; 500 mg of ascorbic acid can be administered orally daily. The amount of ascorbic acid excretion in the urine for 24 hours is measured daily. If it is discharged above 25 mg on the first day or the second day, it is considered "saturated". If the excretion is not reached until the 6th or later, it means extremely "unsaturated". "The body is deficient in ascorbic acid." The advantage of this test method is that it can be combined with clinically available treatment. 3. Another test method is intravenous injection of ascorbic acid 100mg, such as 40mg from the urine within 3h, which is "saturated". Some people have an intravenous injection of 500mg, and it is considered that the discharge of 40% of the urine within 4 hours is normal, and the discharge is less than 20%. There are also people who inject 1000mg intravenously, and it is considered that 500mg is excreted within 24h. Low results may be diseases: vitamin C deficiency, vitamin C deficiency in children Note during inspection: Fresh morning urine should be used as much as possible during this examination. The urine that is randomly selected is preferably mid-stage urine. Not suitable for the crowd: menstrual women. Inspection process Inspection process: As with routine urine tests, use a clean, dry container with a disposable urine cup and urine test tube provided by the hospital. Take about 10 ml of urine and send it to the designated inspection window of the hospital for examination by a doctor. Not suitable for the crowd Menstrual women. Adverse reactions and risks no.