Tubular Reabsorption of Phosphate (TRP) | KK Women's and Children's Hospital

Specimen Container

Gel separator tube (Adult)
Microtube (Paeds)
Wide mouth sterile container (Urine)

Specimen Requirement

Plain Blood
Adult: 5 mL
Paediatric: 1.3 mL

Urine
Urine Creatinine - 10 mL (Second void morning urine specimen)
Urine Phosphate - 10 mL (Second void morning urine specimen)

Please note that concentrations of phosphate in blood and urine generally increase after a meal. Blood (serum) specimen should be drawn after at least 8 hours of fasting if possible. Second void morning urine specimen should be collected and sent together with blood specimen to the laboratory as soon as possible.

Orderable as Urgent?

Reference Value(s)

Creatinine
Phosphate
Urine Creatinine
Urine Phosphate

Reference intervals for Tmp/GFR

Age	Male (mmol/L)	Female (mmol/L)
0 day to <3 months	1.48 - 3.43
3 months to <6 months	1.48 - 3.30
6 months to <2 years	1.15 - 2.60
2 years to <18 years	1.15 - 2.44
18 years to <40 years	1.00 - 1.35	0.96 - 1.44
40 years to <60 years	0.90 - 1.35	0.88 - 1.42
60 years and above	0.80 -1.35