High Sensitivity C-Reactive Protein (hs-CRP)

What it is

High Sensitivity C-Reactive Protein, often shortened to hs-CRP, is a protein that your liver produces. It's a type of marker that signals inflammation within your body. Think of it like a smoke detector for inflammation – when there's a fire (inflammation), the alarm (hs-CRP) goes off. The "high sensitivity" part means this test can detect very small amounts of CRP, even when inflammation is mild or low-grade.

Normally, your body has very little CRP circulating in the blood. However, when there's any kind of inflammation, infection, or tissue injury, the liver ramps up its production of CRP, and the levels in your blood rise. This rise can happen quite quickly.

Why it matters

Hs-CRP is particularly interesting to doctors because it can indicate low-grade, long-term inflammation. This type of inflammation might not cause obvious symptoms but can contribute to the development of various chronic health conditions over time.

One of the key areas where hs-CRP is used is in assessing the risk of cardiovascular disease, which includes conditions like heart attacks and strokes. Chronic inflammation is thought to play a significant role in the development and progression of atherosclerosis – the build-up of fatty plaques in your arteries. Higher levels of hs-CRP can suggest that this inflammatory process is more active, potentially increasing your risk of heart-related problems.

It's important to understand that hs-CRP is a general marker of inflammation. It doesn't tell you where the inflammation is or exactly what's causing it. However, when considered alongside other risk factors and tests, it can provide valuable information about your overall health and potential future risks.

What can cause it to be high or low

Several factors can influence your hs-CRP levels.

Factors that can be associated with higher hs-CRP levels include:

• Inflammatory conditions: This is the most direct cause. Conditions like rheumatoid arthritis, inflammatory bowel disease (Crohn's disease or ulcerative colitis), or lupus can lead to elevated hs-CRP.
• Infections: Both acute (short-term) and chronic (long-term) infections can trigger an increase in hs-CRP.
• Tissue injury or damage: This could be from an injury, surgery, or even a heart attack.
• Cardiovascular disease: As mentioned, the inflammation associated with atherosclerosis can raise hs-CRP.
• Obesity: Carrying excess weight, particularly around the abdomen, is often linked with increased low-grade inflammation and higher hs-CRP.
• Smoking: Smoking is known to promote inflammation throughout the body.
• Certain lifestyle factors: A diet high in processed foods and low in fruits and vegetables, and a lack of regular physical activity, can contribute to higher levels.
• Age: hs-CRP levels can naturally tend to increase slightly as people get older.
• Hormone Replacement Therapy (HRT) or the combined contraceptive pill: These can sometimes be associated with slightly higher levels.

Factors that can be associated with lower hs-CRP levels:

• Effective treatment of underlying inflammatory conditions or infections: When the cause of inflammation is successfully managed, hs-CRP levels typically fall.
• Weight loss: Achieving and maintaining a healthy weight can help reduce inflammation.
• Regular physical activity: Exercise is generally associated with lower inflammation markers.
• A healthy diet: A diet rich in fruits, vegetables, whole grains, and healthy fats can help reduce inflammation.
• Stopping smoking: Quitting smoking can lead to a reduction in inflammatory markers over time.

It's worth noting that hs-CRP levels can fluctuate. A single high reading doesn't necessarily mean you have a serious problem, especially if you have a temporary illness or injury at the time of the test. Your doctor will usually consider your hs-CRP result in the context of your overall health picture.

Lifestyle factors that may help

Making certain lifestyle changes can be beneficial for managing inflammation and potentially influencing your hs-CRP levels. These are often topics that can be discussed with your GP.

• Healthy Eating: Focusing on a diet rich in colourful fruits and vegetables, whole grains, lean proteins, and healthy fats (like those found in olive oil, nuts, and avocados) is often recommended. Limiting processed foods, sugary drinks, and excessive saturated fats may also be helpful.
• Regular Exercise: Engaging in regular physical activity, such as brisk walking, cycling, swimming, or dancing, can have a positive impact on inflammation. Aiming for a mix of aerobic exercise and strength training is often suggested.
• Maintaining a Healthy Weight: If you are overweight or obese, losing even a small amount of weight can make a difference in reducing inflammation.
• Not Smoking: If you smoke, quitting is one of the most impactful things you can do for your overall health, including reducing inflammation. Support is available to help with this.
• Managing Stress: Chronic stress can contribute to inflammation. Exploring stress-management techniques like mindfulness, meditation, yoga, or spending time in nature might be beneficial.
• Adequate Sleep: Ensuring you get enough quality sleep each night is important for overall health and can play a role in regulating inflammatory processes.

Questions to discuss with your GP

If your hs-CRP test result has been discussed with you, or if you are concerned about inflammation and your heart health, here are some questions you might consider discussing with your GP:

• What does my hs-CRP result mean in the context of my overall health and other test results?
• Are there any specific underlying causes for my hs-CRP level that we should investigate further?
• Based on my hs-CRP level and other risk factors, what is my current cardiovascular risk?
• What lifestyle changes do you recommend for me to help manage inflammation and improve my heart health?
• Are there any other tests that might be helpful to understand my inflammation status or cardiovascular risk better?
• How often should my hs-CRP levels be re-checked, if at all?