
Eating before a blood test: do you need to fast?
Some blood tests need fasting, but many do not. This guide explains when fasting matters, what to do before your appointment and why Optimum Health Screening health checks don’t require fasting.
Articles about specific blood tests, what they measure, and how results are usually interpreted.

Some blood tests need fasting, but many do not. This guide explains when fasting matters, what to do before your appointment and why Optimum Health Screening health checks don’t require fasting.

Kidney function blood tests can help show how well your kidneys are filtering waste from your blood. This guide explains creatinine, eGFR, urea, electrolytes and when to speak to your GP.

A plain-English guide to five widely used blood tests — what they measure, why they matter and how they fit into a sensible health baseline for adults.
Articles are no substitute for a check-up. Our health checks start from £125 — no GP referral needed.