Test Name

Leucocytes,
Urinalysis

Test Code

377

Unit

Leu/mL

Station

Urinalysis

Synonym Name/Abbreviation

WBC, Leucocyte esterase

CPT Code

81003

Performing Facility

American Medical Labs, Herzliya
Pituah

Analyzer

Roche Miditron-M

Test Method

Combur-10 Urine Stick ( Reflectance photometer;
Semi-quantitative)

AML Preferred Tube

Routine urinalysis leakproof tube or container, BD urine
transport tube, or sterile urine cup.

Storage Instructions

Examination of urine with test strips must be performed
within 2 hours of collection.
Transport refrigerated up to 24 h. Protect from light. Do not add
preservatives.

Min. Volume

10 mL random urine

Comments

Results with findings will reflex to a Urine Microscopic
analysis.

Turn-Around-Time

One day.

Intended Use

The leucocytes excreted in urine are almost exclusively
granulocytes, whose esterase activity is detected in the test-strip
reaction. Leukocyturia is an importante guide symptom of inflammatory
diseases of the kidney and urinary tract,eg: bacterial infections
(glomerulonephritis, cystitis, urethritis or abacterial infections ( due
to yeasts, fungi, viruses), intoxications, urine-voiding
disturbances.

Limitations

Formaldehyde, imipinem, meropenem, clavulanic acid may cause
false-positive results. Bilirubin and nitrofurantoin may intensify the
color reaction. High protein or glucose excretion as well as gentamycin,
cephalexin, and boric acid may diminish the intensity of the
reaction.

Patient Preparation

A voided specimen is usually acceptable. If specimen is
likely to be contaminated, a clean catch midstream specimen is
desirable.

Reasons for Rejection

Improper labeling; tubes with boric acid or tartaric acid
(e.g. BD gray-top C&S tube);
Boricon, Bortiex, or Boricult yellow-top C&S tubes; specimen
not refrigerated or preserved; specimen more than 48 hours old when
unpreserved/refrigerated or more than 72 hours old for BD transport
tube.

Adult Reference Ranges

Negative (<10 leu/mL)