Blood Test Information

Procollagen 3 peptide
(a.k.a P3NP)
minimum sample volume required ~ 5ml

back to assay index

Test Code: P3P

Tube type: SST

Special instructions
None

Clinical cut-off intervals

Indications for biopsy
Pre-treatment: >13.0
During treatment: >7.0 in at least 3 samples over 12 months
During treatment: >13.0 in 2 consecutive samples

Indications for withdrawal of methotrexate
During treatment: >17.0 in at least 3 samples over 12 months

Sent away to the Metabolic Bone Laboratory, Norwich and Norfolk University Hospitals NHS Foundation Trust

Units
µg/L

Turnaround Time
28 days

Department: Biochemistry

Clinical Application
The decision to perform biopsy, withdraw treatment, or continue treatment despite raised PIIINP concentrations, must also take into account other factors, such as disease severity, patient age, and the ease with which alternative therapies may be used in place of methotrexate.