• 27 June, 2025
• By Admin

Must-Know Blood Tests To Diagnose Skin Diseases

Multiple underlying conditions can be the cause of skin diseases, among which allergies, infections, autoimmune diseases, and nutritional deficiencies stand out. Although the visual observation by a dermatologist is crucial, a blood test can be critical in establishing a diagnosis, underlying causes and treatment methodology.

We have a wide panel of blood investigations at UniQ Pathlab that will help us to identify the latent causes of chronic or acute onset skin problems. This blog brings you the top blood tests you should be aware of in diagnosing many skin diseases and their implications for your health.

Complete Blood Count (CBC)

CBC is one of the basic tests that gives us information about your general immunity and assists in the identification of:

• Bacterial or viral infections
• Inflammatory responses
• Allergic reactions (count of eosinophils)
• Which may aggravate skin pallor or dryness, anaemia

A CBC can provide some good initial leads in patients with chronic skin rashes, eczema, or inflammation of unclear origin.

Erythrocyte Sedimentation Rate (ESR) & C-Reactive Protein (CRP)

Both ESR and CRP indicate body inflammation.

• High ESR or CRP are signs pointing to autoimmune diseases of the skin, such as lupus, psoriasis, or vasculitis.
• They can also be used to check the progress of treatment and activity of the disease in chronic inflammatory diseases.

They are commonly combined with autoimmune panels to determine whether the system is involved.

Immunoglobulin E (IgE) – Allergy Testing

An increased IgE concentration shows that there is an excess of allergic reaction that is usually present in:

• Eczema (Atopic dermatitis)
• Urticaria (hives)
• Skin flare-ups due to food or environmental allergies

The test assists dermatologists in knowing the answer to the question of whether the skin problem is allergy-related and then devising avoidance or desensitisation measures.

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Antinuclear Antibody (ANA) Test

Autoimmune activity in the body is checked by using the ANA test. It is very applicable in diagnosis:

• Lupus erythematosus (SLE)
• Dermatomyositis
• Scleroderma

A positive ANA result can indicate that your immune system is attacking healthy skin tissue, leading to chronic skin symptoms, rashes, or lesions.

Thyroid Function Tests (T3, T4, TSH)

Skin changes are common when there is an imbalance in the thyroid. Hypothyroidism may lead to:

• Rough, dry and pale skin
• Hair loss or hair thinning
• puffiness or swelling

The hyperthyroidism can cause:

• Itchy skin
• Heat intolerance
• Excessive sweating

Thyroid tests play an essential role in assessing patients who have chronic complaints of the skin without topical therapies.

Vitamin and Mineral Panels

A shortage of required nutrients may cause the development of skin conditions or exacerbate them. There are some significant tests, such as:

• Vitamin D - Low vitamin D level is found in association with psoriasis, eczema, and acne.
• Vitamin B12 and B9 (Folate) -These deficiencies may lead to hyperpigmentation, rashes and hair loss.
• Zinc and Iron levels- Zinc and Iron are essential in healing wounds, preventing acne, and having a healthy skin texture.

There is a targeted nutrition panel that makes your skincare and dietary strategy personal.

Liver and Kidney Function Tests

Skin normally indicates inner well-being. Malfunction of the liver or kidney may result in:

• Itchy skin
• Rashes or discolouration
• Toxin build-up

Such panels assist in determining whether skin symptoms are an outcome of internal organ dysfunction.

Blood Glucose (Fasting/PP) and HbA1c

Patients who have uncontrolled diabetes have a higher tendency to:

• Skin infections
• Slow healing of the wound
• Diabetic dermopathy or thickening of the skin

Blood sugar tests can assist in discerning whether your skin condition is an indication of undiagnosed diabetes or poor glycemic control.

Autoimmune and Specific Antibody Panels

Using advanced autoimmune panels, the following can be diagnosed:

• Pemphigus Vulgaris
• Bullous pemphigoid
• Psoriasis-related autoantibodies

They are particular tests and play a vital role in cases where clinical manifestations indicate complicated immune-related skin diseases.

Final Thoughts

Blood tests are not mere add-ons; they are actually invaluable diagnostic accomplices as far as skin conditions, explaining the same or stubborn, are concerned. It could be the detection of a nutritional lack, it could be the confirmation of an autoimmune disorder, or it could be the analysis of an allergic reaction, but in any of these cases, lab research enables the physician to address the underlying cause.
At UniQ Pathlab, we offer a wide range of diagnostic tests under one roof, ensuring accurate, timely, and affordable analysis for patients and dermatologists alike.