Test Guide Mobile

Tubular Reabsoprtion of phosphate

Plasma/Serum
Test performed by: LabPLUS Automation

The tubular reabsorption of phosphate (TRP) is a calculated parameter which gives information about phosphate handling by the kidney. The TRP is the fraction of filtered phosphate which is reabsorbed by the tubules.

SPECIMENS: 5 mL blood in a heparin tube for phosphate (Pp) and creatinine Cp) and a random urine in a plain container for phosphate (Pu) and creatinine (Cu).

TPR = 1 - (Pu x Cp) / (Pp x Cu)

Reference Intervals

Normal range: 0.82 - 0.95

Diagnostic Use and Interpretation
Decreased in phosphate-wasting disorders such as phosphaturic rickets, and renal failure from any cause.

Increased in hypoparathyroidism and pseudohypoparathyroidism.

Contact Information
Emails to chemicalpathologist@adhb.govt.nz will receive priority attention from the on-call chemical pathologist.
If the query concerns a specific patient please include the NHI number in your email.

If email is not a suitable option, please contact the on-call chemical pathologist via Lablink (Auckland City Hospital ext. 22000 or 09-3078995).

Individual chemical pathologists may be contacted but will not be available at all times.

After-hours : contact Lablink (Auckland City Hospital ext. 22000 or 09-3078995) or hospital operator for on duty staff after hours.

Dr Samarina Musaad (Clinical Lead) : SamarinaM@adhb.govt.nz ext. 22402

Dr Cam Kyle: CampbellK@adhb.govt.nz ext 22052

Dr Weldon Chiu: WeldonC@adhb.govt.nz ext. 23427

Dr Campbell Heron: CHeron@adhb.govt.nz ext. 23427

Dr Sakunthala Jayasinghe: Sakunthala@adhb.govt.nz ext. 23427

Last updated at 15:26:00 06/01/2025