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University of Iowa Diagnostic Laboratories (UIDL) Test Directory 319-384-7212 (local) 1-866-844-2522 (toll free) |
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| Sodium | Order Code: NA
Order Form: Laboratory Requisition |
Specimen: |
Plasma | ||
Collection Medium: |
| ||
Alternate Collection Media: |
Call laboratory for additional acceptable specimen collection containers. | ||
Minimum: |
1 mL whole blood in light green top tube or one microtube for pediatric patients | ||
Rejection Criteria: |
Sodium heparin is not acceptable (elevates Na) | ||
Testing Schedule: |
24 hrs/day, 7 days a week, including holidays. | ||
Analytic Time: |
1 hour (upon receipt in laboratory) | ||
Reference Range: |
135-145 mEq/L. Grossly lipemic samples may give falsely low results. Pediatric Reference Ranges: Age Range Units Premature 130-140 mEq/l Critical value: <120 mEq/l and >160 mEq/l | ||
Test Limitations: |
Patients over a wide anion gap range demonstrated no significant
chloride bias from coulometric titrations. Bromide at 0.7 mmol/l gave a
1 mmol/l chloride response (4).
Selectivity of chloride cartridge (4)(mmol/l of anion required to
increase chloride results by 1 mmol/l)
A list of substances and conditions known to affect the level of
sodium, potassium or chloride in vivo is given by both Young et al (5)
and Friedman et al (6). No representation is made by Roche Diagnostics
regarding the completeness of these lists or the accuracy of the
information contained therein.
References:
(1) Glick MR, Ryder KW, Glick SJ. Interferographs:Users Guide to
Interferences in Clinical Chemistry Instruments, 2nd ed.
Indianapolis, IN: Science Enterprises Inc; 1991:35-44.
(2) Tietz NW. Fundamentals of Clinical Chemistry. Philadelphia, Pa:
3rd ed. WB Saunders Co; 1987:617.
(3) Tietz NW. Clinical Chemistry. Philadelphia, Pa: 2nd ed.,WB Saunders
Co; 1994:1356, 1364, 1365.
(4) Simmons M, Sugahara K, Watanabe M. Development of an Improved
Chloride Electrode for the Boehringer Mannheim/Hitachi 700 Series
Analyzers. Poster session presented at the 1988 National Meeting
of the American Association for Clinical Chemistry, New Orleans,
LA, July 27, 1988 (reprints available from Roche Diagnostics
Corporation).
(5) Young DS, et al. Clin Chem. 1975;21, No 5.
(6) Friedman RB, et al. Clin Chem. 1980;26, No 4. | ||
Methodology: |
Ion Selective Electrode | ||
Sample Processing: |
Centrifuge at 3000 RPM for 10 minutes. Aliquot plasma into labeled container and cap. | ||
Sample Storage: |
Refrigerate. | ||
Transport Instructions: |
Place specimen into zip-lock type bag, seal bag. Place requisition into outside pocket of bag. Ship ambient or refrigerate. | ||
CPT Code: |
84295 | ||
See Additional Information: Chemistry Critical Lab Values Chemistry Pediatric Reference Ranges |
Updated: 12/05/2006