Urinalysis, Microscopic

Cassandra Greaves Test, U


CPT Code: 81015
Order Code: 1390
Includes: WBC, RBC, Epithelial Cells, Bacteria, and other microscopic elements if found
ABN Requirement:  
Synonyms: Urinalysis with Microscopic Exam only
Specimen: Urine, Random
Volume:  8.0 mL
Minimum Volume:  3.0 mL
Container: Urine Specimen Preservative Tube (Cherry Red/Yellow Top or Stockwell Tube)


  1. Collect urine sample according to standard protocols.
  2. Transfer aliquot from a clean urine cup into a urine specimen tube using the vacutainer transfer device included with the tube.
  3. Gently invert tube 8-10 times.
  4. Label tube according to standard protocols.

Patient Preparation: Patient should be instructed to collect a “clean-catch, midstream” urine specimen.

Transport: Store urine at 2°C to 8°C after collection and ship the same day per packaging instructions provided shipping box.


Ambient (15-25°C): 2 hours
Refrigerated (2-8°C): 72 hours
Frozen (-20°C): not acceptable

Causes for Rejection: Specimens other than urine sample in a preservative tube; improper labeling; samples not stored properly; samples older than stability limits; grossly bloody or mucoid samples.

Methodology: Automated Microscopic

Turn Around Time: 1 to 3 days

Limitations: Unusually colored urine due to medication, azo dyes (Pyridium, Azo Gantrisin, and Azo Gantanol) or riboflavin may interfere with any of the urine tests below.

Reference Range: See below

Microscopic ElementsReference Range
WBC0-5 cells/HPF
RBC0-2 cells/HPF
Epithelial Cells0-5 cells/HPF
BacteriaNone HPF
Hyaline Casts< 10 cells/LPF

Clinical Significance: Microscopic examination is performed to detect the presence of abnormal urine cells and formed elements.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.