What tests should be done for Raynaud's syndrome? Laboratory tests for Raynaud's syndrome, such as antinuclear antibody, rheumatoid factor, immunoglobulin electrophoresis, complement levels, anti-natural DNA antibody, cryoglobulin, and Coombs test, which suggest systemic connective tissue diseases, should be used as routine tests for diagnosing Raynaud's syndrome. Let’s take a look at what tests should be done for Raynaud's syndrome.
(1) Provocation Tests:
① Cold Water Test: Immerse the fingers (toes) in cold water at around 4°C for 1 minute to induce typical episodes.
② Fist Clenching Test: After clenching both hands into fists for 1.5 minutes, relax the fingers while keeping them bent; this can also cause changes.
③ Immersing the hands in water at 10-15°C or exposing the whole body to a cold environment can more easily trigger an episode.
(2) Finger Artery Pressure Measurement: This method using photoplethysmography is as precise as finger artery angiography. If the finger artery pressure is more than 5.33 kPa (40 mmHg) lower than the brachial artery pressure, it indicates an obstructive type.
(3) Relationship Between Finger Temperature and Finger Artery Pressure Measurement: Normally, there is only a slight decrease in finger artery pressure with decreasing temperature; in the spastic type, when the temperature drops to the triggering temperature, the finger artery pressure suddenly decreases; in the obstructive type, the finger artery pressure gradually decreases with temperature but is significantly lower than normal at room temperature.
(4) Finger Temperature Recovery Time Measurement: Measured using photoplethysmography. After immersing the fingers in ice water for 20 seconds, the average time for finger temperature to return to normal is 5-10 minutes, whereas patients with this condition often take over 20 minutes.
(5) Finger Artery Angiography and Low-Temperature (After Ice Water Immersion) Finger Artery Angiography: This method not only helps confirm the diagnosis but also differentiates whether there are organic changes in the digital arteries. This method is particularly suitable for those with ischemic ulcers.
(6) Others: Blood tests for antinuclear antibodies, rheumatoid factor, immunoglobulin electrophoresis, complement, anti-DNA antibodies, cryoglobulins, and Coombs test; measuring the nerve conduction velocity of the upper limbs helps detect carpal tunnel syndrome; hand X-rays help detect rheumatoid arthritis and finger calcinosis.
What tests should be done for Raynaud's syndrome? The above is a detailed introduction by experts on what tests should be done for Raynaud's syndrome, hoping it will help you. If you have more questions, you can consult online with experts from Shanxi Yikang Peripheral Vascular Hospital. Finally, wishing you good health.
For more details, please visit the Raynaud's disease section of Shanxi Yikang Peripheral Vascular Hospital: http://www.sxykmgy.com/leinuoshibing/ or consult experts for free, who will provide detailed answers based on the patient's specific situation.
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