• har en lidelse, der kan være forbundet med væskemangel (stort tab af kropsvæske), f. eks. kraftig opkastning, diarré eller feber, eller hvis De drikker meget mindre væske end normalt. • skal have foretaget en operation. • skal have en injektion med farve - eller kontraststof i forbindelse med en røntgenundersøgelse.
• have a condition that may be associated with dehydration (large loss of body fluids) such as being sick with severe vomiting, diarrhoea or fever, or if you drink fluids a lot less than normal • plan to have surgery • are due to get an injection of dye or contrast agent as part of an X-ray