What should you know about a sedimentation rate blood test?

During the test, red blood cells settle in a vertical tube. Changes in blood proteins can make them settle more quickly, which may happen during inflammation. The test does not identify where inflammation is located or what caused it. Anaemia, age, pregnancy, kidney problems and recent illness can also affect the reading.

A clinician compares the result with your history, examination and other investigations. A raised result may be seen during infections or inflammatory conditions, while a normal result may occur despite illness. It cannot confirm or exclude anaemia, Crohn's Disease, coeliac disease or another diagnosis on its own.

Usually, the sample is taken from a vein in your arm and no special preparation is needed. Check whether other blood tests at the same visit require fasting. Mention medicines, pregnancy and recent infections. Afterward, follow the agreed plan rather than trying to interpret the number without its reference range and clinical context.

If symptoms remain unexplained, your clinician may repeat the test or choose other blood, urine or imaging tests. Keep track of fever, pain, stiffness, fatigue and changes in weight because their pattern can help guide the assessment.

Seek a routine appointment for persistent tiredness, joint swelling, recurrent fever or unexplained weight change. Get urgent help for severe shortness of breath, chest pain, new confusion, collapse or sudden one-sided weakness. The urgency comes from these symptoms, not from the sedimentation rate alone.

What does this result mean alongside my symptoms? Could anaemia, pregnancy, kidney disease or a recent infection have influenced it? Do I need another test or a repeat sample? What change in symptoms should prompt earlier review?