The PARK study is a multi-center observational study to assess the performance of the QSant test with kidney biopsy.

QSant is a test based on 6 urinary biomarkers that is used for the evaluation and management of acute rejection in renal allograft recipients with clinical suspicion of rejection.

Non-randomized, unblinded observational study to collect urine samples, coincident allograft biopsy results, and relevant clinical data to evaluate the QSant test.

Participants will be recruited prior to or on the day of an already scheduled kidney biopsy.

Urine samples will be collected before biopsy (protocol and for-cause).

Inclusion Criteria:

1. Kidney transplant recipient ≥ 18 years who are scheduled for kidney biopsy.
2. Kidney biopsy scheduled on a date > 14 days post-transplant
3. Able to understand risks and requirements of participation and provide informed consent
4. Willing and able to comply with the study requirements

Exclusion Criteria:

1. Inability to provide a voided urine sample per collection protocol
2. Urological abnormalities such as catheters, augmented bladder, ileal conduits, mitrofanoff, and vesicostomy
3. History of or current multi-organ transplant

Adult kidney transplant recipients