Phosphorus, Urine

CPT: 84105
Kidney

What This Test Measures

24-hour urine phosphorus; assesses renal phosphate handling.

Preparation

No fasting required
Fasting required. Phosphorus rises significantly after eating. Draw in the morning.

General guidelines only. Requirements vary by lab and individual. Confirm with your provider before adjusting any medications.

Turnaround Time

Varies by lab

Clinical Notes

Used with serum phosphorus in hyperparathyroidism evaluation

ICD-10 Codes

Common diagnosis codes associated with this test. Codes are assigned by your provider.

N18.9Chronic kidney disease, unspecified
N20.0Calculus of kidney

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Lab Codes

Proprietary codes used by each lab for this test.

LabCorp
003293(order_code)

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Related Tests

Phosphorus (Phosphate)

CPT: 84100

Calcium, Serum

CPT: 82310

Calcium, Ionized

CPT: 82330

Magnesium, Serum

CPT: 83735

Magnesium, RBC

CPT: 83735

Calcium, Urine (24-hr)

CPT: 82340

For informational purposes only

This page is for educational and research purposes only and does not constitute medical advice, diagnosis, or treatment recommendations. ICD-10 and CPT codes are assigned by your healthcare provider. Always consult a qualified healthcare provider before ordering any lab test or making decisions about your health.