Finger systolic pressure (FSP) was measured during a standardized cold test in 291 healthy male subjects divided into five age groups. The age groups showed no difference in the change in FSP (FSP%) after cold provocation at 15 and 10°C. In the entire population, the lower normal limits of FSP% were estimated as 76% at 15°C and 63% at 10°C. When a discriminating threshold of FSP%(10°)<60% was applied to the results of the cold test of 31 referents, 65 chain saw workers with or without vibration-induced white finger (VWF), and 20 male patients with primary Raynaud's phenomenon (PRP), the sensitivity of the test to detect digital vasospasm was 84% for VWF and 95% for PRP. In the chain-saw worker group, the positive and negative predictive values of the cold test were 94%. Therefore the measurement of FSP during cold provocation can be considered a useful laboratory test to confirm Raynaud's symptoms objectively in both groups and individuals.
Bovenzi, M. (1993). Digital arterial responsiveness to cold in healthy men, vibration white finger and primary Raynaud’s phenomenon. Scandinavian Journal of Work, Environment and Health, 19(4), 271–276. https://doi.org/10.5271/sjweh.1474