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Test Code LAB114 Potassium, Plasma or Serum

Reporting Title

Potassium

Methodology

Roche Diagnostics, Ion-Selective Electrode (ISE) - RMH, BH, DH, DMH, GCMH, GMC, GMH, HMH, MGH, MH, OBH, PMH, SH, WECC Core Laboratories

Useful in diagnosis and treatment of electrolyte imbalance.

 

VWH Lab Only:

ISE Electrolyte Buffer reagent and ISE Electrolyte Reference reagent, when used in conjunction with SYNCHRON LX® System(s), UniCel® DxC 860i System(s) and SYNCHRON® Systems AQUA CAL 1, 2 and 3, are intended for the quantitative determination of Potassium concentration in human serum, plasma or urine.

Performing Laboratory

OhioHealth Laboratory Services - RMH, BH, DH, DMH, GCMH, GMC, GMH, HMH, MGH, MH, OBH, PMH, SH, WECC and VWH Core Laboratories

Specimen Requirements

Collection Instructions:

1. Serum and Plasma gel tubes should be centrifuged within 2 hours of collection.

2. Red-top tubes should be centrifuged and aliquoted within 2 hours of collection.

Submit only 1 of the following specimens:

 

Preferred:

Serum

Draw blood in a gold-top serum gel tube(s). (Hemolyzed specimen is not acceptable.) Spin down and send 1 mL of serum refrigerated.
Note:

1. A speckled-top serum gel tube (s) or a plain, red-top tube(s) is also acceptable.

2. Indicate serum on request form.

3. Label specimen appropriately (serum).

 

Alternate (Preferred for VWH Lab): 

Plasma

Draw blood in a mint green-top (heparin) gel tube(s). (Hemolyzed specimen is not acceptable.) Spin down and send 1 mL of heparinized plasma refrigerated.

Note: 

1. Indicate plasma on request form.

2. Label specimen appropriately (plasma).

VWH Lab:

3. Tubes of blood are to be kept closed at all times and in a vertical position. It is recommended that the serum or plasma be physically separated from contact with cells within two hours from the time of collection.

4. Separated serum or plasma should not remain at room temperature longer than 8 hours. If assays are not completed within 8 hours, serum or plasma should be stored at +2°C to +8°C for up to 48 hrs. 

 

Roche Specimen Stability Information

Specimen Type Temperature Time
Serum or plasma Refrigerated 14 days
  Ambient  14 days
  Frozen  Stable

 

Specimen Transport Temperature

Refrigerate/Ambient OK/Frozen OK

Reference Values

0-31 days:  3.7-5.9 mmol/L

32 days-1 year:  4.1-5.3 mmol/L

2-12 years:  3.4-4.7 mmol/L

≥13 years:  3.5-5.1 mmol/L

Critical values 0-31 days:  <2.8 mmol/L or >6.5mmol/L      >31 days:  <2.8 mmol/L or >6.0 mmol/L

Alerting category: Always called within 1 hour

 

VWH Lab Only:

3.5 – 5.1 mmol/L

 

Day(s) Test Set Up

Monday through Sunday; Continuously

Test Classification and CPT Coding

84132