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Warfarin		Test Code: WARF
CPT:	80299
Alternate Name:	Coumadin®
Methodology:	High Performance Liquid Chromatography (HPLC)
Testing Schedule:	Routine, Monday-Friday only
Report Available:	2-4 days
Specimen Requirements:
Minimum Volume:	3 mL serum
Container:	Red top (no serum separator) tube
Special Instructions and/or Comments:
Refrigerate
Reference Range:
• Therapeutic:.....................2.0-5.0 mcg • Toxic:.............................>10.0 mcg
Clinical Utility:
Useful for, monitoring patients whose PT is inconsistent with the prescribed warfarin dose, particularly when failure to comply or surreptitious drug use is suspected.

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Watson-Schwartz Test
See Porphobilinogen, Random Urine

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WBC Count
See WBC, No Differential
See WBC with Automated Differential
See WBC with Manual Differential

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WBC, No Differential		Test Code: WBC
CPT:	85048
Alternate Name:	Leukocyte Count; Total; WBC Count; White Blood Cell Count; White Count
Methodology:	Automated Analyzer
Testing Schedule:	Routine, STAT testing available
Report Available:	1 day
Specimen Requirements:
Minimum Volume:	1.5 mL whole blood OR 300- 500 µL in BD Microtainer™ tube
Container:	Lavender top (EDTA) tube OR lavender top BD Microtainer™ tube for capillary collection
Reference Range:
.........Age .....................Cell (x109/L 0-3 days 9.0 - 30.0 4 - 7 days 5.0-21.0 8 - 28 days 5.0-20.0 1 - 5 months 5.0-19.5 6 months - 1 year 6.0-17.5 2 - 3 years 6.0-17.0 4 - 5 years 5.5-15.5 6 - 7 years 5.0-14.5 8 - 14 years 4.5-13.5 15 - 20 years 4.5-13.0 21 years and older 4.5-11.0
Critical Values:
>20.0 x 109/L
Clinical Utility:
Used in the enumeration of white blood cells.

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WBC with Automated Differential		Test Code: WBCD
Includes:	• White Blood Cell Count (WBC) • Automated Differential: if deemed necessary by set laboratory criteria, a manual differential will be performed.
CPT:	85048, 85004, 85060
Alternate Name:	WBC Count; White Blood Cell Count; White Blood Cell Count with Automated Differential
Methodology:	Automated Analyzer
Testing Schedule:	Routine, STAT testing available
Report Available:	1 day
Specimen Requirements:
Minimum Volume:	1.5 mL whole blood OR 300-500 µL in BD Microtainer™ tube
Container:	Lavender top (EDTA) tube OR lavender top BD Microtainer™ tube for capillary collection
Reference Range:
*See CBCD for reference range.
Critical Values:
*See CBCD for reference range.
Clinical Utility:
Used in the evaluation of myelopoiesis, infection, toxic metabolic processes and leukemic states.

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WBC with Manual Differential		Test Code: WBCMD
Includes:	White Blood Cell Count (WBC), Manual Differential
CPT:	85007, 85048, 85060
Alternate Name:	Leukocyte Count; Total WBC; WBC Count; White Blood Count; White Blood Cell Count with Manual Differential; White Count + Differential
Methodology:	Automated Analyzer and Manual
Testing Schedule:	Routine, STAT testing available
Report Available:	1 day
Specimen Requirements:
Minimum Volume:	1.5 mL whole blood OR 300-500 µL in BD Lavender Microtainer™ tube
Container:	Lavender top (EDTA) tube OR lavender top BD Microtainer™ tube for capillary collection
Reference Range:
*See CBCD for reference range.
Critical Values:
*See CBCD for reference range.
Clinical Utility:
Used in the evaluation of myelopoiesis, infection, toxic metabolic processes and leukemic states.

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Wellbutrin
See Buproprion

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West Nile Virus Antibody Profile		Test Code: WNVS
Includes:	IgG and IgM Antibodies
CPT:	86788, 86789
Alternate Name:	West Nile Virus Encephalitis; WNV Antibodies
Methodology:	EIA
Testing Schedule:	Routine, Monday-Friday only
Report Available:	2-4 days
Specimen Requirements:
Minimum Volume:	1 mL serum (Min 0.5mL)
Container:	Gold top (serum separator) tube
Special Instructions and/or Comments:
• Refrigerate • Convalescent specimens, if required, should be submitted at least 2 weeks after the acute specimen. • Cerebrospinal fluid specimens may also be submitted.
Reference Range:
West Nile Virus IgG Antibody:.....< 1.30 INDEX West Nile Virus IgM Antibody:.....< 0.90 INDEX
Clinical Utility:
The West Nile virus IgG and IgM EIA is for the qualitative detection of antibodies to West Nile virus in serum as an aid to the diagnosis of West Nile virus infection in patients with clinical sympotoms consistent with encephalitis. This assay can cross-react with other flaviviruses such as Dengue Fever and St. Louis Encephalitis.

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West Nile Virus Encephalitis
See West Nile Virus Antibody Profile

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West Nile Virus, PCR, Cerebrospinal Fluid		Test Code: WNPCR
CPT:	87798
Alternate Name:	WNV PCR
Methodology:	Real-time PCR
Testing Schedule:	Routine, 2 times per week
Report Available:	5-7 days
Specimen Requirements:
Minimum Volume:	1 mL cerebrospinal fluid
Container:	Sterile conical tube
Special Instructions and/or Comments:
Specimen can be refrigerated for up to 7 days before testing. For longer storage, freeze.
Reference Range:
Not detected
Critical Values:
Positive results are reported to the appropriate State Department of Health.
Clinical Utility:
Detects the presence of West Nile Virus RNA in cerebral spinal fluid to aid in the diagnosis of West Nile virus meningoencephalitis.

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Westergren Sedimentation Rate
See Sedimentation Rate, Westergren, Whole Blood

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Wet Prep for Trichomonas vaginalis
See Trichomonas vaginalis Preparation

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White Blood Cell Count
See WBC, No Differential
See WBC with Automated Differential
See WBC with Manual Differential

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White Blood Cell Count with Automated Differential
See WBC with Automated Differential

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White Blood Cell Count with Manual Differential
See WBC with Manual Differential

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White Blood Count
See WBC, No Differential
See WBC with Manual Differential

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White Cells, Stool
See Leukocytes, Stool

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White Count
See WBC, No Differential
See WBC with Manual Differential

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White Count + Differential
See WBC with Manual Differential

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Whole Blood Alcohol
See Alcohol, Whole Blood

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WNV Antibodies
See West Nile Virus Antibody Profile

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WNV PCR
See West Nile Virus, PCR, Cerebrospinal Fluid

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Wood Alcohol
See Methanol

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Wound Culture
See Culture, Wound, Aerobic

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Wright’s Stain Stool
See Stool for WBCs