How can we use our patient test results data at lab for quality control process?

How can we use our patient test results data at lab for quality control process?

lab report may include the results of the lab’s QA/QC program. These results may be confused with the sample results unless you can recognize the terms and know what they mean. QA/QC tests you may see included in your lab report include:

Trip Blank: This is a sample container, often filled with distilled water. The trip 

blank travels unopened to the site with the empty sample containers and returns 

unopened to the laboratory with the samples. This is done to confirm that no 

contamination has been picked up during the “trip” to and from the sample 

location. If contamination is found in the trip blank, it means that the samples also 

may have been contaminated from a source outside the sample area. The trip blank 

should be non-detect (ND). If it isn’t, your sample results may not be accurate, and 

a new test should be run. 

Duplicate: A duplicate is a second sample, as identical as possible to the first one. 

The sampler will not usually tell the lab about a duplicate sample in order to check 

on how well the lab reproduces an analytical result. The test results for both 

samples should be the almost the same. 

Surrogate: A lab will monitor its analytical system by “spiking” a sample with 

another chemical similar to the contaminant to be tested for. If a good percentage 

(usually70-120%) of the surrogate chemical is recovered, it shows that the lab’s 

test can accurately measure the contaminant sought. If you see “surrogate” results 

on your analysis report, it does not mean that particular chemical that was really in 

your sample.

Matrix Spike: Occasionally something in the sample itself — its soil, water, or 

sediment — interferes with the test for the contaminant. To check for that 

interference, a lab may conduct a “matrix spike” (and a matrix spike duplicate). A 

known amount of the same chemical being tested for is added to two extra samples 

before the analysis. If your report shows “matrix spike” data, check to see that the 

amount of chemical recovered is a good percentage (70-120%). If the percent 

recovery is low, it means that something in the matrix is interfering with the test, 

more work may need to be done to overcome the interference. The percent 

recovery corresponds to the chemical added, not to what was in the original 

sample. A non-spiked sample also is analyzed for that contaminant, so look for the 

result which does not include the spike. 

calibration of the equipment is very important before you start any practical.

regards,

ممكن اخذ عينه عشوائيه او عدة عينات من أشخاص مختلفه وأقيم النتائج أذا تساوت النتيجه بنفس نتيجة المريض فأن الفحص غير صحيح يتوجب علي ضبطه و تفادي المشكله 

أولا اشكر حضرتك علي هذا النشاط والاسئلة والاجوبة الممتازة و ادعوا لشعب فلسطين

يمكن ان نفعل ذلك بتجميع عدد كبير من العينات ذات النتائج الطبيعية ثم عمل خلط جيد لها Good mixing وعمل تحاليل لها ثم ارسالها الي معمل او اكثر يعمل اختبارات جودة Q,C واقارن نتائجي بنتائجة او اعمل بمعملي QC لهذة العينات وهذا هو الافضل وعند الاطمئنان علي نتائج انها سليمة وفي الحدود الطبيعية يمكن ان استخدمها كمعايير للجوده للاجهزه لكن بعد ان يتم حفظها بالطريقة المناسبة لها

1.Patient result Datas are used mainly in Reagent Validation Procedures.

2.It can be used in the interlab comparison.

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