82043

Albumin; urine, quantitative, 24-hour collection

This procedure code describes the quantitative laboratory measurement of albumin in a urine specimen collected over a 24-hour period. This test is crucial for assessing kidney function, particularly for detecting and monitoring microalbuminuria or macroalbuminuria, which are early indicators of kidney damage, especially in conditions like diabetes and hypertension, or for evaluating the progression of existing kidney disease. The 24-hour collection provides a total measurement of albumin excretion over a full day, offering a more comprehensive assessment compared to a single-void specimen.

Clinical Indications

  • Screening for and monitoring of diabetic nephropathy in patients with type 1 or type 2 diabetes mellitus.
  • Screening for and monitoring of hypertensive nephropathy or other chronic kidney diseases.
  • Evaluation of proteinuria in patients presenting with symptoms suggestive of renal dysfunction (e.g., edema, foamy urine).
  • Monitoring the effectiveness of therapeutic interventions aimed at reducing albuminuria or slowing kidney disease progression.
  • Risk stratification for cardiovascular disease in individuals with diabetes or hypertension, as albuminuria can be an independent risk factor.

Procedure Steps

  1. Patient receives instructions for proper 24-hour urine collection, including commencement and completion times, and methods for refrigeration/preservation.
  2. Patient collects all urine over a consecutive 24-hour period into a designated collection container.
  3. The laboratory receives the complete 24-hour urine collection.
  4. The total volume of the 24-hour urine collection is accurately measured and recorded.
  5. A representative aliquot of the well-mixed 24-hour urine sample is obtained for analysis.
  6. Albumin concentration in the aliquot is measured using a quantitative immunoassay method (e.g., immunoturbidimetric, immunonephelometric assay).
  7. The total 24-hour albumin excretion is calculated by multiplying the albumin concentration by the total 24-hour urine volume.
  8. Results are reported in appropriate units, typically milligrams per 24 hours (mg/24 hours).

Coding Guidelines

  • Code 82043 should be reported once per 24-hour urine collection.
  • Do not report 82043 in conjunction with 82044 (Albumin; urine, quantitative, microalbumin, single specimen) when performing a 24-hour collection for quantitative albumin measurement.
  • This code represents the laboratory analysis of the specimen; the collection of the urine specimen by the patient or staff is typically not separately billable under this code.
  • Medical necessity for the test must be clearly documented in the patient's medical record, including relevant diagnoses and clinical indications for ordering a 24-hour collection.

Associated ICD-10 Codes