TMP / GFR, Plasma / Urine

Specimen requirement One timed 2 Hr urine (plain bottle)

'PLUS'

One concurrent plasma sample ( heparin gel tube )

May have more than 1 pair of specimen.
Authorisation code required No
24 Hr available service No
Method Spectrophotometry
Reference interval

0.80 - 1.35 mmol/L

(Source: Payne RB. Renal tubular reabsorption of phosphate (TmP / GFR): indications and interpretation. Ann Clin Biochem 1998; 35: 201 - 206)
Clinical indication

Assessment of renal function
Result interpretation

Reduced in primary hyperparathyroidism, renal tubular disorder, osteomalacia.

Increased in children and hypoparathyroidism.
Measurement of uncertainty See table.
Frequency of measurement Daily