Possible colorings and their meaning are, for example:
bright yellow: often by taking supplements with vitamin B2
yellow-green / blue-green: may indicate a Pseudomonas infection
yellow-brown: often after rhubarb consumption (for acidic urine)
pink: often after rhubarb consumption (for alkaline urine)
red: There may be blood in the urine. But dyes can also be the cause, e.g. from medication or beetroot.
red-brown: There may be blood in the urine.
brown, with yellow or brown foam: Cause can be e.g. liver damage or blocked bile ducts.
Urine consists mainly of water (> 95 %). In addition, various organic and inorganic substances are found in the urine:
- Uric acid
- Amino acids
- Ketone body
- Sodium ions
- Potassium ions
- Ammonium ions
- Calcium ions
- Chloride ions
The pH of urine may fluctuate due to nutrition. PH values of about 5.0 to 6.0 are considered normal.
If the diet consists of a mixed diet that also contains meat, the urine is usually slightly acidic (pH 5.6 to 7.0). A vegetarian diet, on the other hand, makes the urine a little more alkaline (i.e. less acidic).