What it measures
Chloride is a salt in the blood that works with sodium and bicarbonate to keep fluid levels and the blood's acid balance steady. It is usually measured with them as part of an electrolyte panel.
Why people test it
- Part of a wider kidney and electrolyte panel.
- Checked with dehydration, long-lasting vomiting or diarrhoea, or a change in the blood's acid balance.
- Monitored on a prescription that affects fluid balance, such as a diuretic (water tablet).
Typical range
Ranges vary between labs, with the method used, age and sex, and your report shows the lab's own range. One NHS lab gives 95 to 108 mmol/L. Source: North Bristol NHS Trust, Severn Pathology: chloride.
Finger-prick or vein?
Offered as a vein draw only, usually within a wider biochemistry panel.