A device, comprising: - an occlusive element configured to be applied onto a proximal portion of a human limb to apply an occlusion pressure thereto, - a dilation sensing element configured to be applied onto a distal portion of a human limb to sense an extent of dilation thereof, - a control circuit coupled to the occlusive element and the dilation sensing element, the control circuit configured to: - i) control (104, 106) the occlusive element to apply at least one sub-diastolic occlusion pressure (P oc) and maintain said at least one sub-diastolic occlusion pressure (P oc) for a certain occlusion interval (TP oc), - ii) obtain (108; 108a, 108b) from the dilation sensing element a sensing signal, - iii) perform a check of said sensing signal for a certain variation of the dilation of said distal portion of a human limb resulting from said at least one sub-diastolic occlusion pressure (P oc) being removed after said occlusion interval (TP oc), - iv) issue, as a result of said check indicating said certain variation of the dilation of said distal portion of a human limb resulting from said at least one sub-diastolic occlusion pressure (P OC) being removed after said occlusion interval (TP OC), a signal (102, 210) indicating a venous pressure in said human limb which is lower than said at least one sub-diastolic occlusion pressure applied (P oc). - an occlusive element configured to be applied onto a proximal portion of a human limb to apply an occlusion pressure thereto, - a dilation sensing element configured to be applied onto a distal portion of a human limb to sense an extent of dilation thereof, - a control circuit coupled to the occlusive element and the dilation sensing element, the control circuit configured to: - i) control (104, 106) the occlusive element to apply at least one sub-diastolic occlusion pressure (P oc) and maintain said at least one sub-diastolic occlusion pressure (P oc) for a certain occlusion interval (TP oc), - ii) obtain (108; 108a, 108b) from the dilation sensing element a sensing signal, - iii) perform a check of said sensing signal for a certain variation of the dilation of said distal portion of a human limb resulting from said at least one sub-diastolic occlusion pressure (P oc) being removed after said occlusion interval (TP oc), - iv) issue, as a result of said check indicating said certain variation of the dilation of said distal portion of a human limb resulting from said at least one sub-diastolic occlusion pressure (P OC) being removed after said occlusion interval (TP OC), a signal (102, 210) indicating a venous pressure in said human limb which is lower than said at least one sub-diastolic occlusion pressure applied (P oc). - i) control (104, 106) the occlusive element to apply at least one sub-diastolic occlusion pressure (P oc) and maintain said at least one sub-diastolic occlusion pressure (P oc) for a certain occlusion interval (TP oc), - ii) obtain (108; 108a, 108b) from the dilation sensing element a sensing signal, - iii) perform a check of said sensing signal for a certain variation of the dilation of said distal portion of a human limb resulting from said at least one sub-diastolic occlusion pressure (P oc) being removed after said occlusion interval (TP oc), - iv) issue, as a result of said check indicating said certain variation of the dilation of said distal portion of a human limb resulting from said at least one sub-diastolic occlusion pressure (P OC) being removed after said occlusion interval (TP OC), a signal (102, 210) indicating a venous pressure in said human limb which is lower than said at least one sub-diastolic occlusion pressure applied (P oc).