GLOSSARY

Urine Concentration describes solutes relative to sample water, requiring clarification of specific gravity, osmolality or another measurement.

Urine specific gravity compares sample density with reference water, unlike osmolality, which reflects particle number. Glucose, protein and other substances can influence interpretation. Use suitable equipment and consistent methods. A result after suddenly drinking a large volume may differ from the earlier state and cannot alone establish whole-body adequacy or deficit. The two urine measures should not be treated as interchangeable units.

Urine color is a simple awareness tool rather than a specific dehydration test. Vitamins, foods, medicines, lighting and the container can change its appearance. Use similar conditions and adequate light with a chart; permanently colorless urine is not a target. Unusual or blood-like discoloration should not simply be explained away with more drinking, particularly when accompanied by pain or other symptoms.

Urine volume requires a collection interval: one small void is not the same as low output over a whole day. First-morning sampling improves comparability, but sleep, overnight drinking and medicines still matter. Urine markers can lag rapid intake changes. Repeated observations with recorded sampling conditions are therefore more useful for sports decisions than treating an isolated volume or concentration as a complete hydration assessment.