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Geisinger Medical Laboratories Test Catalog
UREA NITROGEN, 24 HOUR URINE |
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ORDERING INFORMATION: |
Geisinger Epic Procedure Code: LAB3210 Geisinger Epic ID: 7047 | |
SPECIMEN COLLECTION |
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Specimen type: |
24-hour urine | |
Preferred collection container: |
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Specimen required: |
5 mL aliquot of urine; minimum 1 mL. | |
Special notes: |
Preferred specimen container is the 24-hour urine container with NO preservative. Mix well. Estimate total collection volume from 24-hour urine container. Remove required aliquot. Record total volume on both aliquot tube and request slip (if applicable). | |
Patient preparation: |
Patient should not be taking excessive amounts of vitamin C as vitamin C will interfere with test. | |
| SPECIMEN PROCESSING |
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Transport temperature: |
Refrigerated (preferred). Room temperature or frozen specimen also acceptable. | |
Specimen stability: |
Room temperature: 2 days. Refrigerated: 7 days. Frozen: 4 weeks. | |
Rejection criteria: |
Stability limits exceeded. Urine containing preservatives is unacceptable. | |
TEST DETAILS |
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Reference interval: |
12.000-20.000 gm/24 hours. | |
CPT code(s): |
84540 | |
| Note: The billing party has sole responsibility for CPT coding. Any questions regarding coding should be directed to the payer being billed. The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only. | ||
Test includes: |
Urea nitrogen 24, 24-hour urine, 24-hour total volume. | |
Methodology: |
Spectrophotometric (Colorimetric) |
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Synonyms: |
UN24
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Clinical significance: |
About 80% of urinary nitrogen is in the form of urea, which is the major end product of protein metabolism. Urea excreted in the urine is the primary method of nitrogen elimination; therefore, this test provides an approximate evaluation of nitrogen balance. Conditions associated with increased urea nitrogen are hypothyroidism, high-protein diets, and postoperative states. Decreased levels are associated with convalescence, liver disease, toxemia, and advanced renal disease. | |
Doctoral Director(s:) |
Hoi-Ying Elsie Yu, PhD, DABCC Sheng-Ying (Margaret) Lo, PhD, DABCC |
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| Review Date: | 12/14/2022 | |