Understanding Itching (Pruritus): Recommended Blood Tests
Learn which blood tests can help identify the cause of itching and why they matter.
Itching, also known as pruritus, is a common symptom that can be caused by a variety of underlying conditions. Understanding which blood tests to consider can help identify the root cause of your itching and guide appropriate treatment.
What is pruritus and why does it occur?
Pruritus is the medical term for itching, a sensation that prompts the desire to scratch. It can be localized to a specific area or generalized over the entire body. Itching can result from skin conditions, allergies, infections, or internal diseases. Sometimes, itching is a sign of a more serious underlying condition, making it crucial to investigate persistent or severe cases.
Common blood tests for diagnosing the cause of itching
Several blood tests can help determine the cause of itching. Here are some commonly recommended ones:
Complete Blood Count (CBC): This test measures various components of the blood, including red blood cells, white blood cells, and platelets. Abnormalities in these components can indicate infections, anemia, or other conditions that may cause itching.
Liver Function Tests (LFTs): These tests assess the health of your liver by measuring levels of enzymes and proteins in the blood. Liver disorders, such as hepatitis or cirrhosis, can lead to itching.
Kidney Function Tests: These tests evaluate how well your kidneys are working. Kidney disease can cause an accumulation of waste products in the blood, leading to itching.
Thyroid Function Tests: These tests measure the levels of thyroid hormones in your blood. An overactive or underactive thyroid can contribute to skin changes and itching.
Blood Glucose Test: High blood sugar levels, as seen in diabetes, can lead to skin changes and itching.
Allergy Testing: Blood tests can help identify specific allergens that might be causing your itching. These tests measure the levels of IgE antibodies in response to various allergens.
Why these tests matter
Identifying the underlying cause of itching is essential for effective treatment. Each blood test provides valuable information about different aspects of your health. For example, abnormal liver function can indicate liver disease, while altered thyroid hormone levels can point to a thyroid disorder. By pinpointing the cause, your healthcare provider can recommend appropriate treatments to alleviate the itching.
Frequently asked questions
Can stress cause itching?
Yes, stress can exacerbate itching by triggering or worsening skin conditions such as eczema or psoriasis.
Is itching always a sign of a serious condition?
Not always. Itching can be due to minor issues like dry skin or a mosquito bite. However, persistent or severe itching should be evaluated by a healthcare provider.
What can I do to relieve itching at home?
You can try moisturizing regularly, avoiding irritants, and using over-the-counter anti-itch creams. However, if itching persists, consult a healthcare provider.
When to see a doctor
It's important to consult a healthcare provider if you experience persistent itching that lasts more than a few weeks, if it's severe or impacts your daily life, or if it's accompanied by other symptoms like jaundice (yellowing of the skin), unexplained weight loss, or night sweats. These could be signs of a more serious underlying condition that requires medical attention.
Always discuss your symptoms and test results with your healthcare provider to determine the best course of action for your specific situation.
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This explainer is queued for our doctor panel and hasn't been individually reviewed yet. It's general information, drawn from standard references - always confirm decisions with your own clinician.