Specimen Preparation: Transfer 8 mL urine to ARUP Standard Transport Tubes. (Min: 4 mL)
Storage/Transport Temperature: Frozen.
Unacceptable Conditions: Random urine.
Stability (collection to initiation of testing): Ambient: Unacceptable; Refrigerated: 1 week; Frozen: 6 months
Reference Interval:
Age
PYR µmol/mol creatinine
DPYR µmol/mol creatinine
DPYR/PYR Ratio
0-11 months
353-560 µmol/mol crt
46-113 µmol/mol crt
0.13-0.20
1-3 years
108-400 µmol/mol crt
19-94 µmol/mol crt
0.18-0.24
4-9 years
117-325 µmol/mol crt
20-75 µmol/mol crt
0.19-0.25
10-14 years
81-267 µmol/mol crt
13-61 µmol/mol crt
0.17-0.27
15-19 years
38-80 µmol/mol crt
10-18 µmol/mol crt
0.20-0.26
20 years and older
20-40 µmol/mol crt
5-11 µmol/mol crt
0.23-0.29
Interpretive Data:
Pyridinoline and Deoxypyridinoline excretion follows a circadian rhythm. Reference intervals have been established on first morning void urine samples.
