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Visit Our Sponsor:. Very true, and yet sometimes interpreting the result of a pregnancy test can feel like a science experiment and in some ways it totally is. Let me walk you through the ins and outs of home pregnancy tests.

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Accessibility Contact Privacy Terms. Calculators Charts Tables. The elimination of urine is very important for different bodily functions.

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The colors on a pH strip measure the concentration of hydrogen ions in a solution or in soil. The color on the strip determines the acidic or alkalinity state of the item being tested. With pH test strips -- each carefully treated with chemicals -- you can learn about the solution's acid or base quality through color, depending on the type of pH paper being used.

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Hello everyone I get really annoyed when I read all these articles and comments about 'evaporation lines' on home pregnancy tests, and especially, when such comments or articles are said to be written by so-called 'experts' or 'clinicians', and which seem to leave a large number of women with all sorts of doubts and anxieties about test-results. So I thought I would sit and write a few facts about various similar tests. I am a clinician and I also have much experience using various tests within laboratories or clinical settings.

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Blue evaporation line on pregnancy test. Evap Lines are self explanatory, they can start to form once the Urine starts to dry on the test and it evaporates. Blue dye tests, for whatever reason, have bad evap lines which can show up before the time is even up.

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The Protein test strip detects residual Protein in water in increments of 0. If used to test protein in urine, the color may be more green than blue. If testing urine samples, consider using the Urine Analysis Test Strip.

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In pregnant women, premature rupture of membranes PROM occurs when the amniotic sac that surrounds the baby the membrane breaks before the start of labor. It occurs more frequently in twin pregnancies. At the hospital, simple tests can confirm that your membranes have ruptured.

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You can make paper test strips to determine the pH of an aqueous solution by treating filter paper with any of the common pH indicators. One of the first indicators used for this purpose was litmus. Litmus paper is paper that has been treated with a specific indicator - a mixture of natural dyes obtained from lichens mainly Roccella tinctoria that turns red in response to acidic conditions pH 7.

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A standard urine test strip may comprise up to 10 different chemical pads or reagents which react change color when immersed in, and then removed from, a urine sample. The test can often be read in as little as 60 to seconds after dipping, although certain tests require longer. Routine testing of the urine with multiparameter strips is the first step in the diagnosis of a wide range of diseases.


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