Understanding Lab Tests for Skin Flushing
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Skin flushing is a condition characterized by sudden redness and warmth of the skin, typically caused by the dilation of small blood vessels near the surface. While there isn't a specific blood test to diagnose skin flushing itself, laboratory testing plays a fundamental role in identifying potential underlying causes and guiding appropriate treatment.
Recommended Test
Vitamin B3
This test measures vitamin B3 (niacin/nicotinic acid) levels in the blood. Excessive intake of nicotinic acid, whether from supplements or medications, can trigger skin flushing episodes by causing the widening of small blood vessels near the skin's surface. Testing can help determine if elevated B3 levels are contributing to your flushing symptoms.
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Why Blood Testing is Important for Skin Flushing
Skin flushing can result from various factors including medications, supplements, hormonal changes, or underlying medical conditions. Blood tests are essential for investigating these potential causes, particularly when flushing episodes are frequent, severe, or accompanied by other symptoms. Testing helps healthcare providers develop targeted treatment strategies.
Understanding Your Results
If vitamin B3 levels are elevated, this may explain your skin flushing episodes, especially if you're taking niacin supplements or medications. Your healthcare provider can help adjust dosages or recommend alternative treatments to reduce flushing while maintaining the therapeutic benefits of vitamin B3.
Important Considerations
The information here is for educational purposes only and is not a substitute for professional medical advice. Always consult with a healthcare provider for diagnosis and treatment.
