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HelpTest ID: HGB_Q Hemoglobin, Qualitative, Urine
Reporting Name
Hemoglobin, QL, UUseful For
Screening for hematuria, myoglobinuria, or intravascular hemolysis
Specimen Type
UrineSpecimen Required
Container/Tube: Plastic, 10-mL urine tube (T068)
Specimen Volume: 5 mL
Collection Instructions: Collect a random urine specimen.
Specimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Refrigerated | 72 hours |
Reference Values
Appearance (internal specimens only): normal
Hemoglobin: negative
RBCs (internal specimens only): 0-2 rbcs/hpf
Test Classification
This test has been cleared, approved or is exempt by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
81002
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| HGB_Q | Hemoglobin, QL, U | 5794-3 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| APP4 | Appearance | 5767-9 |
| HGBQL | Hemoglobin, QL | 5794-3 |
| RBC3 | RBC | 46419-8 |
Clinical Information
Free hemoglobin (Hgb) in urine usually is the result of lysis of RBCs present in the urine due to bleeding into the urinary tract (kidney, ureters, bladder). Less commonly, intravascular hemolysis (eg, transfusion reaction, hemolytic anemia, paroxysmal hemoglobinuria) may result in excretion of free Hgb from blood into urine.
Injury to skeletal or cardiac muscle results in the release of myoglobin, which also is detected by this assay. Conditions associated with myoglobinuria include hereditary myoglobinuria, phosphorylase deficiency, sporadic myoglobinuria, exertional myoglobinuria in untrained individuals, crush syndrome, myocardial infarction, myoglobinuria of progressive muscle disease, and heat injury.
Interpretation
Free hemoglobin (Hgb), in the presence of RBCs, indicates bleeding into the urinary tract.
Free Hgb, in the absence of RBCs, is consistent with intravascular hemolysis.
Note: RBCs may be missed if lysis occurred prior to analysis; the absence of RBCs should be confirmed by examining a fresh specimen.
The test is equally sensitive to hemoglobin and to myoglobin. The presence of myoglobin may be confirmed by MYOU / Myoglobin, Urine.
Clinical Reference
Fairbanks, V.F. and Klee G.G., Textbook of Clinical Chemistry 1986, Chapter 15, p 1562
Analytic Time
Same day/1 dayMethod Name
Dipstick
Forms
If not ordering electronically, complete, print, and send a Benign Hematology Test Request Form (T755) with the specimen.
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