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Test Code WSWBC Wright Stain For WBC

Additional Codes


Specimen Required

Specimen Type: Preserved Urine

Submission Container/Tube: Red/Yellow Tube (UA-preservative)

Specimen Volume: 8 mL

Collection Instructions: 

  1. Preferred specimen is a mid-stream, clean catch sample.

Additional Information:

  1. The first morning specimen is most concentrated and is preferred, although fresh random samples are acceptable. If testing is delayed (>2hours after collection), the specimen without preservatives should be refrigerated for up to 4 hours.


Specimen Type: Unpreserved Urine

Submission Container/Tube: Sterile container

Specimen Volume: 8 mL

Specimen Minimum Volume

1 mL

Specimen Stability

Preserved & Unpreserved Urine

Room temperature: 2 hours

Refrigerated: 4 hours

Frozen: Unacceptable

Reference Range

None seen

Day(s) and Time(s) Performed


Report Available

Same day

Clinical Significance

The examination of urine sediments has been studied in an effort to diagnose renal allograft rejections. This concept is based on the fact that the skin graft rejection has sometimes been associated with peripheral eosinophila as well as prominent eosinophilic infiltration below the graft site.

Eosinophils may be seen in the urine sediments of patients with drug-induced interstitial nephritis, including hypersensitivity to drugs such as penicillin and its derivatives, and with other acute genitourinary tract disorders. Detection is important, since treatment is effectively achieved by discontinuing the drug.

Performing Laboratory

Inova Laboratories

2832 Juniper Street

Fairfax, VA 22031


Eosinophils in urine are sometimes difficult to recognize since the orange granules look paler in urine than in peripheral blood smears. A combination of granule color and size, nucleus shape and cell size may be needed to identify urine eosinophils.


Eosinophils, Random, Urine