tear electrolyte

Tears contain a variety of electrolytes. Most of the ion concentrations are related to the blood ion concentration. At present, electrolyte analysis has only been developed in recent years. The use of electrochemical analysis technology, ie ion selective electrode (ISE) technology, is a special automatic biochemical analyzer for measuring K+, Na+, Cl, HCO3- and the like. Because of its fast and accurate advantages, it has become popular. Basic Information Specialist Category: Ophthalmology Classification: Biochemical examination Applicable gender: whether men and women apply fasting: not fasting Tips: Rub your eyes with your hands and don't eat spicy food. Normal value Tear electrolyte reference value Ion name ion concentration K+19.1±5.3mmol/L; Na+125.4±17.1 mmol/L; Ca+0.76±0.32mmol/L; Mg2+0.07±0.28mmol/L; Zn2+31.98±12.09 μmol/L; Cu2+0.69±0.27μmol/L; Fe2+, Fe3+9.31±5.02μmol/L; Cl106±130mmol/L; HCO 326 ± 30 mmol / L. Clinical significance Abnormal results In patients with lacrimal cystic fibrosis, tear calcium concentration increased, while sodium ion concentration decreased. The concentration of tear calcium in patients with pterygium, herpes simplex keratitis and chronic conjunctivitis is significantly reduced. In herpes simplex keratitis, the tear zinc is also significantly reduced. In chronic conjunctivitis, tear iron was also significantly reduced. The concentration of sodium, magnesium, bicarbonate and chloride in tears is significantly correlated with its concentration in serum, so its determination can indirectly reflect the concentration of ions in the blood. Need to check the population with eye disease groups. Precautions Inappropriate people: generally no special population. Taboo before inspection: rub your eyes with your hands and do not eat spicy food. Requirements for inspection: Because this test is divided into a variety of methods, patients need to be inspected according to the doctor's instructions, different hospitals may have different methods. Inspection process When the method of collecting tears is different, the content of each component is different. The method of tearing should be selected according to the purpose of the examination and the amount of tears. The methods of collection are: 1. Stimulating the tearing method: collect more tears on the right and send it to a number of test applications. Collect a thin layer of cool oil or acupuncture the eye on the lower eyelid skin. After the tears are reflected, use the capillary to absorb the tears in the outer ankle. 2. Capillary tearing method: The capillary is contacted with a capillary having an inner diameter of 0.20.3 mm, and the tear fluid is drained into the capillary. This method collects tears with almost no irritating reflex tears. 3. Adsorption and tearing method: The weighed filter paper is placed in the lower conjunctival sac of the subject to absorb the tear fluid, and the paper is taken out and weighed after being saturated with tears. According to the tear ratio of 1.005, the amount of tears absorbed by the sheet was determined. Not suitable for the crowd no. Adverse reactions and risks no.

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