Flashcards in Quiz 1: Ranges Deck (6)
Sodium: Clinical implication, normal range, crit. values, normal urine, renal threshold, Specimen type
Amount of sodium is a reflection of the balance between amount taken in and amount excreted
Normal range = 136- 145 mM or mEq/l,
Critical values: 160 mM
Normal urine = 40- 220mM
Renal threshold = 120 +/- 10mM (above this means all is excreted; below this means it is retained)
CSF = approx.same as serum values for Na
Acceptable specimens: serum, heparinized plasma (Mild Hemolysis is acceptable since not much Na+ is in the cell (extracellular ion))
Potassium: Clinical implication, normal range, crit. values, normal urine, renal threshold, Specimen type
Low & high K in cardiac patients may lead to cardiac arrhythmias and heart attack, and requires monitoring.
Normal: 3.5-5.1 mmol/L or mEq/L
Critical: 6.5 mM or mEq/L
Normal urine: 80-90% of daily intake
Renal threshold: none
CSF: 70% of plasma
Hemolyzed sample should be avoided: slight hemolysis can falsely elevate results. Intracellular K+ is much greater than plasma K+.
Muscular activity (fist clenching during phlebotomy) can increase value by 20%
• Normal Cl = 98-107 mEq/L
• Normal Urine: 110-250mmol/24hrs
Important in the differential diagnosis of metabolic alkalosis
- Decreased Cl excretion (less than 15 mmol/24hr)
Normal = 22-26mmol/L
• Buffering system to maintain physiological normal pH (7.35-7.45)
• pH= pka + log HCO3- H2CO3
• The maximum buffer capacity of bicarbonate-carbonic acid system at pH of 7.4 is at a ratio of 20:1. This is maintained by the lungs which expels CO2.
• Reference range: 0.6-1.5 mg/dL
• Critical range: > 2.0 mg/dL
• May be ordered, along with BUN and/or microalbumin for known renal patients or to monitor drug therapies.
• Levels may also reflect muscle injury.