Skip to main content

Table 4 Normal morphological parameters on capillaroscopy

From: Position article and guidelines 2018 recommendations of the Brazilian Society of Rheumatology for the indication, interpretation and performance of nailfold capillaroscopy

Capillaroscopic parameters Normal pattern
Skin transparency and visibility Capillaries are clearly visible
Pericapillary edema Absent
Subpapillary venous plexus Visible in > 30% of healthy individuals
Capillary architecture Capillaries perpendicular to the nail edge
Capillary morphology Inverted “U” shape
Capillary loop diameter < 20 μm
Tortuosity Normally absent
Dilated and giant loops Absent
Neoangiogenesis Absent
Microhemorrhages Normally absent
Capillary density 7 to 12 capillaries/mm
Avascular areas Absent
Capillary blood flow Dynamic, without stasis
  1. Adapted from Chojnowski et al., 201659 (D)