A vectorised function to generate a PELD score for paediatric liver transplant candidates. The default unit for bilirubin is µmol/l and albumin in g/l, but these can be changed to mg/dl and g/dl respectively by setting the optional units parameter to "US".
peld(INR, bili, albumin, listing_age, growth_failure, units = "SI")
serum biliruin (µmol/l)
serum albumin (g/l)
age at the time of listing (years; integer or decimal)
whether there is growth failure (1 = yes, 0 = no)
units used for bilirubin ("SI" for µmol/l (default), "US" for mg/dl)
numeric vector of PELD scores
Some labs report albumin in g/dl rather than the g/l used in this function. If units are set to "US" then g/dl is assumed and albumin should be divided by 10 if the lab reports are in g/l. If using SI units, take care to multiply the lab albumin by 10 if the lab output is in g/dl.
Reference: McDiarmid SV, Anand R, Lindblad AS, et. al. Development of a pediatric end-stage liver disease score to predict poor outcome in children awaiting liver transplantation. Transplantation 2002; 74(2):173-81.
peld(INR = 2, bili = 54, albumin = 25, listing_age = 2, growth_failure = 1)#>  18.76637peld(INR = 2, bili = 3.1, albumin = 25, listing_age = 2, growth_failure = 1, units = "US")#>  2.858796