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Epic Test Code LAB21012 Urinalysis, Routine

Performing Location(s)

BMC,CRH,LFH,HRK,OCH,FTT,FOX

Synonyms

Urinalysis; UA

Specimen Type

Random Urine

Preferred Container

Random Urine Collection Tube

Alternate Container

Sterile Container

Minumum Volume to Submit for Testing

5 mL Urine

  • Multiple test can be performed from this volume. For question please contact the lab at 547-3975.  

Storage Requirements

See Causes of Rejection for temperature requirements.
May be refrigerated up to 24 hours

DO NOT USE CHEMICAL PRESERVATIVES

Transportation Needs

Deliver specimen to the laboratory within 1 hour of collection. If not possible see “Storage Requirements”

Causes for Rejection

Mislabeled or unlabeled specimen

Specimen received in container with Chemical Preservatives

>1 hrs room temperature

 > 24 hours refrigerated

Quantity insufficient for analysis

Interference by chromogen metabolite from certain antibiotics

Gross hemolysis

 

Limitations

All tests may be unreliable if the specimen is grossly bloody or if the color of the urine is markedly affected by metabolites from certain antibiotics.

 

Glucose sensitivity is affected by concentrations of ascorbate greater than 50 mg/dl causing false negatives when patient samples lie between 75-125 mg/dL glucose.

 

Ketone bodies (40 mg/dL) may also reduce the sensitivity of the test for specimens containing small amounts of glucose (75-125mg/dL).

 

Specific gravity may be decreased with highly buffered urines

 

False positives for protein may be caused by highly buffered urines.

Reference Values

Macroscopic
Parameter Population Units Reference Range
Color All populations None Yellow, straw or colorless
Appearance All populations None Clear
Specific Gravity All populations None 1.003-1.024
pH All populations None 5.0-8.0
Protein All populations mg/dL Negative
Glucose All populations mg/dL Negative
Ketone All populations mg/dL Negative
Bilirubin All populations None Negative
Blood All populations None Negative
Urobilinogen All populations Eu/dL ≤ 1.0
Nitrite All populations None Negative
Leuk Esterase All populations None Negative

 

Microscopic
Parameter Population Units Reference Range
RBC's All populations #/hpf 0-2
WBC's All populations #/hpf <6
Squamous Epithelium All populations #/hpf <6
Transitional Epithelium All populations #/hpf 0-3
Bacteria All populations None None
Crystals All populations #/hpf None
Hyaline Casts All populations #/lpf 0-2
All Other Casts All populations #/lpf None
Critical Values:
  Glucose > 100 mg/dL  (Obstetric or pediatric [<18yrs] only).
  Ketones > 40 mg/dL (Obstetric or pediatric [<18yrs] only).
 

 

Reflex Testing

Reflex Testing Data: When an RTUA is ordered:

Only a macroscopic analysis (urine dipstick and gross visual inspection) is performed and CPT #81003 is billed if.

The sample’s appearance is clear, and
The specimen is colorless, straw, yellow or amber, and
the urine Macroscopic analysis does not reveal an abnormality on any of the following dipstick tests:

Blood, Glucose, Leukocyte esterase, Nitrites, Protein

 

A macroscopic analysis and a urine sediment microscopic examination is performed and CPT #81001 is billed if

The sample is cloudy, or if …..

The sample is brown, red, green or orange, or if ….
During the Macroscopic (reagent dipstick) analysis an abnormality is detected on any of the following tests:

Blood, Glucose, Leukocyte esterase, Nitrites, Protein

Days of Analysis

All

Available STAT

Yes

Includes

Reagent dipstick testing for urine glucose, protein, pH, specific gravity, ketones, bilirubin,urobilinogen, blood, nitrite, leukocyte esterase and gross visual examination for appearance and color.

 

A urine sediment microscopic examination will be performed as determined by the information found in the Reflex Testing Data section, below.

Additional Information

Specimens kept at Room Temperature for > 2 hours are unsuitable for analysis

Suggest early morning first voided urine for maximum concentration of urine analytes and formed elements

Methodology

Urine reagent strip; automated testing

CPT Code

see Reflex Testing

Last Updated

22-July-22 BHD