The cold stimulation test for Raynaud's phenomenon is a test that measures the temperature of each finger after they are placed in an ice-water bath.
A heat sensor is taped to your fingers and the temperature is recorded. Your hand is then immersed in ice water for 20 seconds. Then it is removed from the bath and the temperature recorded every 5 minutes until your finger temperature is the same as it was before the bath.
No special preparation is necessary for this test.
There may be some discomfort while your hand is in the cold water.
This test is a screening tool for Raynaud's phenomenon.
Normally your finger temperature will return to normal within 15 minutes after the cold water exposure.
You may have Raynaud's phenomenon if your finger temperature takes greater than 20 minutes to return to pre-bath temperature.
There are no risks associated with this test.
This test should not be performed if you have a finger infection or problems with the blood supply to your fingers.