Chloride blood test in Chiswick

What the test measures

Chloride is a negatively charged mineral, or electrolyte, found mainly in the fluid outside cells. Most of it comes from salt (sodium chloride) in food. It moves closely with sodium to control how much water is held in the body, and it balances bicarbonate to help keep the blood at the right acid level. The kidneys adjust how much chloride is kept or lost in urine.

Because of these links, chloride is rarely interpreted alone. It is usually read alongside sodium, potassium and bicarbonate, which together show whether fluid and acid balance are where they should be. Changes in chloride often mirror changes in sodium, but differences between the two can help clinicians understand acid and base problems. The price includes the blood sample taken at our Chiswick clinic, analysis at the Randox accredited laboratory, a review of your result with an Omnia practitioner and a GP feedback report on request.

Who it is for

• You want to check your hydration and electrolyte balance after a period of illness.
• You take diuretics, laxatives or other medicines that can affect electrolytes.
• You have a kidney condition and want regular monitoring.
• You train or work in hot conditions and sweat heavily for long periods.
• Your GP found an abnormal electrolyte result and suggested a repeat.

Understanding your result

Your report shows your chloride with the laboratory reference range. A high level is most often linked to dehydration, but can also follow some types of kidney problem, prolonged diarrhoea or a large intake of salt. A low level can be caused by prolonged vomiting, some diuretics, heart failure or conditions that cause the body to retain water and dilute the blood.

Your practitioner will read chloride with your other electrolytes and kidney markers, and with how you have been feeling. If you feel very unwell, confused or faint, seek urgent care rather than waiting for a booked test. Where your level falls outside the range, the next step is a discussion, not a diagnosis.

Preparing for your test

No fasting is needed for chloride. Drink water normally before your appointment, as being dehydrated can affect the result. Let us know about any recent vomiting or diarrhoea and the medicines you take.

Chloride is part of our Kidney Health Check, which reads it with sodium, potassium and creatinine. For a broader picture, Omnia Essential includes chloride with liver, cholesterol and blood count markers. You will also find every blood test and price in Chiswick.

Questions

How much is a chloride blood test in Chiswick?

The chloride blood test costs £49. This covers the sample at our W4 clinic, analysis at an accredited laboratory, a practitioner review of your result and a GP feedback report if you would like one.

Does salt intake affect chloride?

A very high salt intake can nudge chloride up, but healthy kidneys usually keep it in balance. Dehydration is a more common cause of a raised level.

Why is chloride tested with sodium?

The two usually rise and fall together because they come mostly from salt. Looking at both, plus bicarbonate, helps explain fluid and acid changes.

Do I need to fast for a chloride test?

No. You can eat and drink normally. Staying well hydrated before your test gives the most representative result.