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HelpTest Code PDBUN Bun Pre & Post Hemodialysis, PDBUN
Useful For
Measurement of the ratio of calcium clearance to creatinine clearance (fractional excretion of calcium) has been used primarily for distinguishing familial benign hypercalcemia from other causes of increased serum calcium in adult patients. Generally, benign hypercalcemia is characterized by a decreased urine calcium excretion, resulting in a decreased clearance ratio.
Synonyms/Keywords
Post Bun, Post Dialysis, Urea Nitrogen, PDBUN
Specimen Requirements
| Fasting Required | Specimen Type | Preferred Container/Tube | Acceptable Container/Tube | Specimen Volume | Specimen Minimum Volume (allows for 1 repeat) |
|---|---|---|---|---|---|
| No | Plasma/Serum | Lithium-heparin plasma separator (PST), Serum Separator (SST) | Lithium or Sodium-heparin Green Top (GTT), Red Top Tube (RTT) | 1 mL | 0.5 mL |
Collection/Processing Instructions
Pre-dialysis specimen should be collected prior for use in calculations
Samples collected in a RTT or GTT must be removed from cells within one hour for storage or transport. Samples collected in gel barrier tubes must be removed from the primary tube prior to transporting to Marshfield. Do not send the primary collection tube.
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Plasma/Serum | Ambient | 5 days |
| Refrigerated | 7 days | |
| Frozen | 3 months |
Rejection Criteria
Specimens collected in ammonium heparinate or oxalate
Test Components
Pre-dialysis urea nitrogen, Post-dialysis urea nitrogen, height, weight, calculated total body water, urea reduction, delivered KT/V, and protein catabolic rate
Reference Range Information
| Performing Location | Reference Range |
|---|---|
| Marshfield | 6-24 mg/dL |
Marshfield Labs Performing Department
Marshfield Labs Chemistry
Performing Information
| Performing Location | Day(s) Test Performed | Analytical Time | Methodology/Instrumentation |
|---|---|---|---|
| Marshfield | Monday through Sunday | Less than 2 hours | Urease GLDH Rate Assay/ Beckman AU |
CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 84520 | 1 | PreBUN | ||
| 84520 | 1 | PostBUN |
Outreach CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 84520 | 1 | PreBUN | ||
| 84520 | 1 | PostBUN |
Ordering Applications
| Ordering Application | Description |
|---|---|
| Cerner | Careset: BUN Pre & Post Hemodialysis, PDBUN
|
| 4media | BUN Pre & Post Hemodialysis, PDBUN |