In 80s,urine analyzer is researched and developed by medical equipment companies. Due to its simple operation, quick, it has become a necessary equipment for hospitals . But how to ensure the accuracy of the test results and the reliability is not easy. From all around pharmacological basis every laboratory and daily control situation, the differences between each instrument is unsatisfactory, sometimes even as visual result is accurate, and even misdiagnosis. Investigate its reason, mainly because the use method and maintain is not ture. We summarize the experience of using it for 10 years .And list them for reference.
1 Perfect management system is to guarantee the normal operation of the instrument.
1.1 Urine analyzer is a basic laboratory equipment, use frequency is high and the workload is big, each staff should grasp skilled. So the necessary to use the management system and the operation manuals, used the recording, fault and maintenance records must be set up. To carry out routine maintenance, fault rate will inevitably less, the fault analysis and maintenance also convenient, at ordinary times working quality is guaranteed, that every staff uses urine analyzer easily.They do every day with the test standards, every week do artificial urine qc, for many years in addition to updating the accessories has been using normal, get the clinician's widely sure.
1.2 Work environment must follow the manufacturer requirements. Such as voltage should be stable in 220 + 10 V between, or should add regulators; Indoor clean; Relative humidity below 50%, or integral ball easily pollution of aging. Indoor temperature relatively stable, try to stability in the 18-28 degrees between. Low temperature of the chemical reaction is slow, the result is low, the temperature too high chemical reaction too fast, false-positive rate increases.
1.3 The quality of the dipsticks affected the accuracy of the test reults. We have in the same instrument with five domestic 8 A dipsticks to the same quality of urine are measured, and the results urine 1 + 3 +, PH4.5-6.0, protein 1 + 3 +, concealed blood 1 + 3 +, bilirubin 0-2 +, ketone bodies 2 +-4 +. Show that dipsticks from different manufacturers have different quality , so preparation or purchase artificial urine to conduct regular indoor qc testing of dipsticks is very necessary. At the same time that the nation in control diagnostic reagents in market access should be strengthened.
2 Regular maintenance can ensure is the normal work of the instrument
We usually do the comprehensive clean for one month, every three months for a complete overhaul, including a complete clean and integral ball light value determination.The method is turned on hold and the key to START UP key, turned on the power and into the standard tests with a test.The instrument can be printed out 620, 550 light wave length value, general should be controlled in 1500-2000, more than the range can be adjusted three integral ball potentiometer, if not reach the 1000 show that integral ball is old and must be replaced. Another light path components to keep clean, light lamp wants to change regularly to ensure that the light value meet detection requirements.
3 Carefully analyse the reason of failures and promptly eliminate
3.1 TROUBLE－4: is the most common fault hint, show that light value shortage, the failure may cause by these reason:
3.1.1 Illuminant light bulb aging or inappropriate position, to try again after replacement bulbs, especially on counting window should be the filament.
3.1.2 Light path has dirt, and check the dirt and mass of detect windows, reflex, slice and optical path.
3.1.3 After replacing bulbs should reduced the voltage of both ends of the light source
3.1.4 Point light source for deviation, after startup observation points under the ball out of the window as if light with reagents base corresponding article, or should be adjusted integral ball position.
3.1.5 Integral ball of the window seal off, vapor evaporation to speed up the ball inside the integral points of aging, should resume will seal piece of cement.
3.1.6 Article reagent base pollution, poor drainage, or partial a also can cause the above suggestion.
3.1.7 Above check is normal, failure can't rule out, may be integral ball aging, but by measuring the integral ball light value to judge.
3.2 TROUBLE－5: Common reason is placed inappropriate position of article reagent or article reagent base two detection hole pollution, the cleaning can, another integral ball aging also can appear above tip.
3.3 Print chromaticity abate, not clear, for printed piece of aging, general is updated annually
3.4 Print or don't walk deviation of paper, printing gear damage, should be updated gear
3.5 Urine pump sucks fluid ability is not strong, should check whether the pipeline leak jams, liquid bottle mouth sealing lax, if pipeline problem solving, should check whether the urine pump gateway jam and, when necessary, open pump to examine two negative pressure membrane is damaged, update when necessary.
The operation of urine analyzer is fast and simple and the machine has a high degree of automation.But because it is the most frequent use, working time the longest, application scope is the most extensive use, so the relatively high failure rate, the cause of failure is various, but maintenance is the key.Only when we do well in the day-to-day management of the instrument, regular maintenance, timely to ensure out fault the normal operation of the instrument. In addition it is after all a half quantitative instruments, human urine concentration is unable to control, timely communication with clinical and, when necessary, do the biochemical quantitative diagnosis in urine.
