PATIENT INFORMATION
Why do I need a blood count?
A complete blood count (CBC) is a common blood test.
What it measures
- Haemoglobin, which carries oxygen. A low level is called anaemia.
- Platelets, which help blood clot.
- White blood cells, which can change with infection and some other conditions.
Why it may matter before surgery
Anaemia matters because surgery may involve blood loss and because severe or clinically important anaemia can affect how oxygen is carried around the body. Low platelets can increase bleeding risk and may affect whether a spinal or epidural anaesthetic is suitable.
Whether you need a blood count depends on the operation, your health and local practice.
If a problem is found
If anaemia is found, the team may look for the cause and decide whether it should be treated before elective surgery. Treatment may include iron, either as tablets or through a drip, depending on the cause and how much time there is before surgery.
Tell the team if you have heavy periods, black stools, blood loss, or a known blood disorder.
An abnormal result needs interpretation in your clinical context. Do not decide whether surgery is safe, or change treatment, solely from information on this website.