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Test Code Lytes Electrolytes

Clinical System Name

Electrolytes

Description

Rapid analysis of sodium, potassium, chloride, carbon dioxide, and calculation of anion gap.

Sample Requirements

Specimen: Whole Blood

Container(s):  Gold SST, Lt. Green/Li Heparin Microtainer, Dark Green/Sodium Heparin, Red, Gold Microtainer,

Preferred Vol:  1.0 mL

Minimum Vol:  0.5 mL

 

Notes:  For fastest electrolyte turnaround time, please see test for Electrolytes Syringe

Processing Instructions

Reject due to:  Insufficient Quantity, hemolysis, age of specimen

Spin: Y

Aliquot: Y

Storage location: Core 5 Chemistry Refrigerator

 

Off-site collection: Specimen should be centrifuged within 2 hours of collection. Spin blood and transfer serum or plasma to plastic tube and refrigerate or freeze.

Stability

Specimen Type Temperature Time
Serum or Plasma RT

≤ 24 h

Serum or Plasma 2-8 C

≤ 3 d

Serum or Plasma -20 C or -70 C

≤ 30 d

Availability

STAT Performed TAT
Y 24/7 1 h

Performing Laboratory

Seattle Children's Laboratory    

Department

Department:  Core Chemistry

Phone Number: 206-987-2617 (Client Services)

Reference Range

               Reference Ranges

Analyte (unit)

Age

Serum or Plasma

Sodium (mmol/L)

 

0 - 1 w

1 w - adult

132 - 142

135 - 145

Potassium (mmol/L)

0 - 2 d

2 d - 3 m

3 m - adult

3.7 - 5.9

3.4 - 5.6

3.5 - 5.5

Chloride (mmol/L)

0 - 1 y

1 y - adult

96 - 110

96 - 109

CO2 (mEq/L)

All ages

18 - 27

Methodology

Method:  Potentiometric and Enzymatic Endpoint method by Vitros 4600

Analytical Volume:  0.20 mL serum or plasma

Critical Values

Analyte (units)

                                       Results

Age

Low

High

Sodium (mmol/L)

All ages

≤ 124

≥ 160

Potassium (mmol/L)

0 -2 day

2 day – 3 m

3 m - adult

< 3.1

< 3.1

< 3.1

> 6.4

> 5.9

> 5.9

Chloride (mmol/L)

All ages

≤ 70

≥ 130

CO2 (mEq/L)

All ages

≤ 10

≥ 40