Skip to content
Trusted to do 100,000+ tests and consultations per month.
Trusted to do 100,000+ tests and consultations per month.

NOTES FROM THE LAB

Hello! My name is Jamila Quaye and I am a senior biomedical scientist with a specialism in haematology, here at One Day Tests laboratory.

C-Reactive protein (CRP) - description and reference ranges

What is it?

C-Reactive protein (CRP) is an "acute phase reactant", i.e. it is a protein that is made in direct response to an initial injury or inflammation. It is an immediate marker that can be reliably used to monitor disease or inflammation levels as the concentration of CRP in the blood can increase hugely in a short period of time, in response to inflammation or chronic disease flare up.

CRP is a protein made by the liver that is released into the blood within a few hours after tissue injury or the start of an infection/inflammation. It marks most acute conditions such as post heart attack, surgery, sepsis, breakages and tissue damage.

However, it does not point to the specificity of the injury, i.e. there are no different types of CRP for different injuries.

Reference ranges

If your indicative CRP level is lower than the reference range for our laboratory:

If the CRP concentration in your blood is low it means your inflamation/infection is not present or has reduced.

You can discuss this result with your GP if you have concerns.

If your indicative CRP level is higher than the reference range for our laboratory:

An increased or increasing amount of CRP in blood suggests an infection or inflammation that needs to be treated. However, CRP does not readily point to the location of the problem, merely a flare up or a new problem, or indeed, potentially ineffective treatment.

You should discuss this result with your GP.

QUICK TEST FINDER

Find what you need in under 30 seconds with our (very clever!) test finder.

We offer a huge range of markers all a few clicks away, as well as fastest turnaround times.

FIND YOUR TEST
QUICK TEST FINDER

YOU MAY ALSO LIKE TO READ

  • blood cells
    Dr. Adam Staten

    WHAT SHOULD I DO IF MY RDW IS HIGH?

    Finding an unfamiliar abbreviation flagged on your blood test results can feel unsettling, especially when you are not sure what it means or how concerned to be. If your RDW has come back higher than the reference range, the first thing to know is that a raised RDW is relatively common and does not automatically indicate something serious. What it does tell you is that your red blood cells are varying more in size than would normally be expected, and that is worth understanding and, in most cases, investigating a little further.
    Read now
  • adding sodium to drink
    Dr. Adam Staten

    WHAT DRINKS ARE HIGH IN SODIUM?

    When most people think about cutting back on sodium, they focus on food. Salt in cooking, processed meats, crisps, ready meals. Drinks tend to fly under the radar, yet some common beverages contain more sodium than you might expect. Whether you are trying to manage your sodium intake for health reasons or simply want a clearer picture of what you are consuming, knowing which drinks contribute to your daily sodium load is worth understanding.
    Read now
  • stressed out man
    Dr. Adam Staten

    CAN STRESS CAUSE HIGH ESR?

    If you have had a blood test come back with a raised ESR and you are trying to make sense of it, stress may well be on your mind as a possible explanation. The short answer is that yes, chronic stress can contribute to a higher ESR, but the relationship is indirect and there are many other factors that can raise it too.
    Read now