Half and half nails
Encyclopedia
Half and half nails show the proximal portion of the nail
Nail (anatomy)
A nail is a horn-like envelope covering the dorsal aspect of the terminal phalanges of fingers and toes in humans, most non-human primates, and a few other mammals. Nails are similar to claws, which are found on numerous other animals....

 white and the distal half red, pink, or brown, with a sharp line of demarcation between the two halves. Seventy percent of hemodialysis
Hemodialysis
In medicine, hemodialysis is a method for removing waste products such as creatinine and urea, as well as free water from the blood when the kidneys are in renal failure. Hemodialysis is one of three renal replacement therapies .Hemodialysis can be an outpatient or inpatient therapy...

 patients and 56% of renal transplant patients have at least one type of nail abnormality. Absence of lunula
Lunula (anatomy)
The lunula, or lunulae , is the crescent-shaped whitish area of the bed of a fingernail or toenail. The lunula is the visible part of the nail matrix The lunula, or lunulae (pl.) (little moon in Latin), is the crescent-shaped whitish area of the bed of a fingernail or toenail. The lunula is the...

, splinter hemorrhage, and half and half nails were significantly more common in hemodialysis patients, while leukonychia was significantly more common in transplant patients.
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