If you are talking about three substances that are normally found in blood but not in urine, they are leukocytes, erythrocytes and glucose.
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The two main substances found in urine are water and waste products, such as urea, creatinine, and uric acid.
Substances like waste products (e.g., urea, creatinine), excess ions (e.g., sodium, potassium), and water are normally filtered out of the bloodstream in the nephron as part of the formation of urine.
The specific gravity of urine indicates the amount of dissolved substances in urine. It is a measure of the density of urine compared to water. A higher specific gravity indicates a higher concentration of dissolved substances, while a lower specific gravity indicates a lower concentration.
Having clear urine does not necessarily mean that it is free of drugs. Drug presence in urine depends on the substances consumed and their detection window. A drug test specifically designed to detect drugs is required for an accurate assessment.