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K+
See Potassium, Serum

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K+, Urine
See Potassium, Urine

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K, Body Fluid
See Potassium, Body Fluid

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Karyotype
See Chromosome Analysis, Blood

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KCN
See Thiocyanate

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Keppra
See Levetiracetam

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Ketone Bodies
See Acetone, Semiquantitative

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Ketones, Semiquantitative
See Acetone, Semiquantitative

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Kidney Biopsy
See Histopathology, Renal Biopsy

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Kidney Stone Analysis
See Stone Analysis

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Kidney Stone Diagnostic Risk Profile		Test Code: KSP
Includes:	• Volume Measurement • Collection Period • Calcium, Urine • Chloride, Urine • Citrate Excretion, Urine • Creatinine, Urine • Oxalate, Urine • pH, Urine • Phosphorus, Urine • Potassium, Urine • Sodium, Urine • Uric Acid, Urine
CPT:	81050. 82340, 82436, 82507, 82570, 83945, 81002, 84105, 84133, 84300, 84560
Alternate Name:	Kidney Stone Risk Profile
Methodology:	See individual test listings.
Testing Schedule:	Routine, daily
Report Available:	5-7 days
Specimen Requirements:
Minimum Volume:	Entire 24 hour urine collection .
Container:	24-Hour plastic urine container, no preservative
Collection:	24-Hour urine collection: See special instructions for “24-Hour Urine Collection”, listed under Specimen Collection, Preparation, and Handling Section
Special Instructions and/or Comments:
Patient should maintain a normal diet prior to testing.
Reference Range:
See Individual test listings

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Kidney Stone Risk Profile
See Kidney Stone Diagnostic Risk Profile

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Kleihauer-Betke Test		Test Code: KLB
CPT:	85460
Alternate Name:	Acid Elution for Fetal Hemoglobin; Fetal Hemoglobin Stain; Fetal-Maternal Hemorrhage Test
Methodology:	Manual
Testing Schedule:	Routine, STAT testing available
Report Available:	1 day
Specimen Requirements:
Minimum Volume:	1.5 mL whole blood
Container:	Lavender top (EDTA) tube
Reference Range:
0 mL of fetal-maternal hemorrhage
Clinical Utility:
Used to determine possible fetal-maternal hemorrhage.

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KOH/Calcofluor Prep		Test Code: KOH
Includes:	Microscopic examination for fungal elements.
CPT:	87220
Alternate Name:	Fungus Smear; Potassium Hydroxide Preparation
Methodology:	KOH Prep
Testing Schedule:	Routine, Monday-Friday 0800-1430
Report Available:	1-3 days
Specimen Requirements:
Minimum Volume:	Hair, skin, nails in sterile dry container
Collection:	The specimen may be divided for fungus culture and KOH preparation; mycobacteria culture and smear; and routine bacterial culture and Gram stain, only if the specimen is of adequate volume for all tests requested.
Special Instructions and/or Comments:
Requisition Form must include site of specimen collection.
Reference Range:
No fungal elements identified.
Clinical Utility:
Fungal direct exam detects the presence of fungi directly from a clinical specimen.

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KRAS Mutation		Test Code: KRAS
Includes:	Detection of KRAS mutation in colon 12 and 13 of exon 2
CPT:	83891, 83898, 83896 x 2, 83907, 83912
Methodology:	Real-time PCR
Testing Schedule:	Routine, 1 day per week
Report Available:	5-7 days
Specimen Requirements:
Minimum Volume:	Four freshly cut sections of Formalin-fixed Paraffin Embedded tumor tissue
Container:	Transfer freshly cut sections to a 2.0 mL tube.Add 1 mL xylene
Special Instructions and/or Comments:
Fix tissue samples in 4-10% formalin as quickly as possible after surgical removal. Use a fixation time of 14-24 hours. Thoroughly dehydrate samples prior to embedding
Reference Range:
KRAS Mutation Not Detected..
Clinical Utility:
The presence of KRAS mutation in Colorectal cancer tumors correlates with poor prognosis and is associated with lack of response to EGFR inhibitors. Studies have demonstrated that patients with KRAS mutations would not benefit from anti-EGFR therapy and therefore KRAS status should be determined prior to treatment.