There are numerous impairment-based measures that exist to assess impairments of somatosensory modalities (light touch, joint position sense, vibration, etc.).
The modality most often tested by occupational and physical therapists is light touch.
People post-stroke who have somatosensory loss in one modality, such as light touch, typically have somatosensory loss in other modalities, such as proprioception.
It is therefore reasonable in people post-stroke to do a quick screen of one somatosensory modality, light touch, on only one or two places on the affected limb.