Beta-trace protein (BTP) can be used to estimate the glomerular filtration rate (GFR). This may be particularly useful in renal transplant patients treated with corticosteroids, for whom cystatin C may not be reliable.
Normal reference range for BTP: 0.40 – 0.74 mg/L
BTP in mg/L
GFR mL per min per 1.73 square meter BSA
< 1.12 mg/dL
> 60
1.12
60
1.17
50
1.29
40
1.62
30
> 1.62
< 30
If BTP is plotted vs GFR in JMP:
GFR in mL per min per 1.73 square meter BSA =
= (144.14406 / ((BTP)^4)) – (99.7429 / ((BTP)^2)) + 47.206451
= (401.66704 / ((BTP)^2)) – (501.2114 / ((BTP)) + 186.44196
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Specialty: Nephrology, Clinical Laboratory
ICD-10: ,
