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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.
How the test is performedA 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.
How to prepare for the testNo special preparation is necessary for this test.
How the test will feelThere may be some discomfort while your hand is in the cold water.
Why the test is performedThis test is a screening tool for Raynaud's phenomenon.
Normal ValuesNormally your finger temperature will return to normal within 15 minutes after the cold water exposure.
What abnormal results meanYou may have Raynaud's phenomenon if your finger temperature takes greater than 20 minutes to return to pre-bath temperature.
What the risks areThere are no risks associated with this test.
Special considerationsThis test should not be performed if you have a finger infection or problems with the blood supply to your fingers.
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I once saw a video with a person throwing hot water into very cold air it instantly froze how come it does not work with cold water?
In fact hot water freezes quicker in a cold climate, because of the sudden temperature change. If you want to test it for yourself, take two ice trays, fill one with cold water and one with very hot water, stick them in the freezer, and see that the hot water freezes quicker.
Which freezes first hot cold or salt water?
My fiance and I did an experiment with hot and cold water to see which one would make ice cubes faster. Honestly they froze at about the same time. He was taught that because its hot the molecules come together faster in the cold air, but during the test it was equal. As for the salt water I would think that would come in last.
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