Evaporation line pictures: Pictures of Evap Lines…??

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12 Pictures Of Positive Pregnancy Tests From Popular & Obscure Brands

At-home pregnancy tests are great because with just a quick trip to the bathroom they have the potential to tell you whether or not you have a baby growing inside you. As convenient as they are, they can also be somewhat difficult to read, so it’s sometimes useful to compare your test with other positive pregnancy test photos to help you figure out what exactly is going on. If nothing else, it sure beats squinting your eyes and questioning whether it’s a line you’re seeing or a figment of your imagination.

At-Home Pregnancy Test False Results

If you’ve ever been seriously suspicious that you’re pregnant, you’ve likely taken a few separate tests, just to be sure the result is accurate. This is a really smart practice because results can change, but timing is often the culprit for a false result. “Home pregnancy tests, in general, are reliable and some report 99% accuracy rates,” explains Kimberley Thornton, MD, FACOG, in an email to Romper, “However, these tests assume an individual is testing at the optimal time. ” On most test labels, you’ll see a chart indicating that the test is most accurate on the first day of your missed period or later, even if they advertise that you can take it as early as five days (or more) before the day of your missed period. If an at-home test is taken too soon, you risk getting a false negative. “Errors occur if the test is taken too early in the course of the pregnancy,” OB/GYN, Felice Gersh, M.D., tells Romper in an email. “Accuracy requires closely following the instructions [and the] the timing of the test relative to one’s ovulation and fertilization of the egg.”

Other common causes of false negatives, according to Dr. Thornton and Dr. Gersh include general user error, over-hydration (diluting your urine too much), and expired tests. False positives are not nearly as common, but they do sometimes occur. Dr. Gersh says one reason for this is an early or missed miscarriage. Certain fertility medications can also result in a false positive, Dr. Thoronton explains, because women are often doing some form of hormone treatment leading up to conception and if they’re not completely out of your system by the time you test, they could alter your result.

What Does A Faint Line On A Pregnancy Test Mean?

Assuming you’ve followed directions and you’re taking the test at the right time, you can feel confident in your test results, but that doesn’t mean the result will be totally clear. Aside from digital tests, most home pregnancy tests use strips that have a control line (or two) and a test line that will show up if it’s positive. However, that test line can come in all kinds of shades and it can appear right away or after a few minutes. So, how do you know how to read it?

The answer for this depends largely on the specific test you’re using. For the most part, a super-light line on a pregnancy test is considered a positive, it’s just faint because there isn’t a lot of hCG (the pregnancy hormone) in your urine yet, which is often the case when you’re taking the test before your missed period. Typically, if you retake the test a few days later, it will come out positive again, and with a much darker line.

One caveat to this, though, is that if the faint line appears later after the result window has ended, it may not be accurate. Each test has its own instruction manual that will tell you how long you should wait for your result after testing your urine sample as well as how long that result is good for (this can range anywhere from five minutes to one hour, depending on the test).

As for what a typical positive looks like for common brands and test styles, here are some positive pregnancy test photos to compare your test to.

1. Clearblue Early Detection Pregnancy Test

Clearblue / YouTube

With this test, the control line is on the right side of the result window, and the test line is to the left. If the test line doesn’t appear at all, then it’s reading as a negative result. However, if even a faint test line (in any shade of pink) appears, then it’s considered a positive result.

2. Up & Up (Target) Advanced Early Result Pregnancy Test

Up & Up (Target)

Target offers a store-brand pregnancy test that uses blue lines in two separate result windows. The control line is in the oval window on the right and the test line is in the circle window on the left. If a blue line appears in the circle, it’s a positive result, even if the line is faint and/or thin compared to the control line.

3. First Response Early Results Pregnancy Test

First Response / YouTube

First Response Early Result tests are very popular because they allow you to test several days before your missed period. However, positive results can be very difficult to read because of the low about of hCG in the urine that early on in pregnancy. For instance, I used this test for both of my pregnancies and the positive line was so faint and thin it didn’t even show up in the picture I took to send to my husband while he was at work.

The test has one window with a pink control line on the right and the test line on the right. If the test line appears (no matter how faint) it is assumed positive. Since this test can be so difficult to read, First Response has an app that you can use to help you determine your result.

4. CVS One-Step Pregnancy Test Pregnancy Test

CVS Health

CVS carries a variety of different store-brand pregnancy tests, but this is their standard one-step option. It has two result windows, a circle that has a blue horizontal control line and an oval to the right with a vertical blue control line. If a second vertical line appears in the circle window (to create a “plus” sign), then the test is positive. Again, even a faint or thin line is considered positive for this test.

5. Clear Blue Digital Pregnancy Test with Smart Countdown

Clearblue / YouTube

Digital tests are by far the easiest to read, like this one just says “Pregnant” or “Not Pregnant” once it has finished processing the sample. One thing to note with digital tests is that they are often less sensitive than the ones that use lines, so your traditional test may look positive but the digital test could read negative. If that’s the case, retest with the digital stick in a couple of days to see if the results change.

6. Lia Flushable Pregnancy Test

Lia

Lia pregnancy tests are so innovative because they can simply be torn up and flushed after they’ve served their purpose. The test pad uses a similar line system as traditional stick tests do, with a thick, pink control line at the top of the result window and the test line underneath. This test is absolutely reliable, but its design may make it a little more difficult to read if you’re trying to test early.

7. First Response Digital Pregnancy Test

First Response / YouTube

First Response also offers its own digital pregnancy test, which is much easier to read than those thin pink lines can be. When it’s positive, “Yes +” pops up on the digital screen to let you know that you’re pregnant. Like other digital tests, though, this one may be less sensitive to hCG, so results will be more reliable the closer you are to the day of your missed period.

8. Modern Fertility Pregnancy Test

Modern Fertility

Modern Fertility pregnancy tests are designed similarly to other standard sticks, but it also comes with access to an app that helps you track your cycle so you know when is the best time to start testing. That being said, you’ll know you have a positive test if two lines appear in the result window. Keep in mind, the test line (on the left) may be thin or very light pink.

9. Clear Blue Rapid Detection Pregnancy Test

Clearblue / YouTube

There are two windows on this pregnancy test, with the one on the right displaying the blue vertical control line. The larger square window will have a blue horizontal control line and, if the test is positive, there will be a vertical blue line creating a “plus” sign to indicate you’re pregnant. The blue lines can vary in thickness and shade, so don’t assume a faint line is a negative.

10. AccuMed Pregnancy Test Strips

AccuMed

Test strips are typically very cost-effective but can be a bit harder to use because you have to collect your urine sample in a cup, dip the strip into the urine (but not too far or for too long), and then you have a very short window for how long the result is accurate. For AccuMed test strips, there will be a thick pink control line closer to the handle end of the strip, and the test line will appear under it. The test line may vary in shade, but if it’s there and you’re reading the result in the correct window of time, it’s a positive.

11. Natalist Pregnancy Test

Natalist

Natalist pregnancy tests work like any other traditional stick test. There is a result window on the front which has a pink control line on the right and a pink test line on the left. The test line may show up in various shades of pink, so you might have to look closely to see a positive result (like the one in this picture). What makes Natalist a little different, though, is that it’s a net-zero plastic product, which means for every pound of plastic they produce/sell, they remove one pound of plastic solution from the earth.

12. PREGMATE Pregnancy Test Strips

PREGMATE

PREGMATE is another common pregnancy test strip that you can buy in bulk amounts. Like most other strips, it’s sensitive and needs to be administered carefully and read within a short time window to avoid false results. When the strip is held vertically, with the handle end at the top, the thick, pink control line will be visible at the top of the result window and the test line will appear below it. The test line may be very faint, depending on when you test.

Pregnancy tests are usually the most difficult to read in the days leading up to your missed period (which is also usually when you’re the most eager to find out your result). If you’re testing early and get a negative, remember to do a follow-up test in a few days to confirm the negative result. The closer you are to your missed period, the more accurate, and clear, the test will be.

Experts:

Felice Gersh, M.D., OB/GYN and Founder & Director of the Integrative Medical Group of Irvine, in Irvine, CA, & the author of PCOS SOS Fertility Fast Track

Kimberley Thornton, MD, FACOG, Assistant Professor of Reproductive Endocrinology & Infertility Icahn School of Medicine at Mount Sinai, Reproductive Medicine Associates of NY

DOC2US — Your trusted online doctor

Whether a pregnancy test turns out positive or negative, most women would agree that getting one can be one of the most nerve-wracking experiences they have or will be going through.

And that’s normal.

Because let’s face it, things can get a little confusing to understand and correctly interpret what the lines on the test actually mean.

How Does Home Pregnancy Test Work?

In general, an at-home pregnancy test is a simple way to find out if you’re pregnant before seeing a doctor. If you are not sure how to use one, here’s an Infographic on How To Use Home Pregnancy Test.

This test works by detecting the levels of human chorionic gonadotropin (hCG) levels during the first trimester of pregnancy, which is a hormone the body produces during pregnancy.

The test process itself is easy as it only requires users to urinate on the test stick and checking the results after a few minutes. But the results often can be confusing. 

Some pregnancy test involves two lines: a control line and a test line. The control line should appear on every test (an indication that the pregnancy test is valid), but the test line appears only if there are some levels of hCG detected in your urine.

  1. If your pregnancy test result only reveals one line (the control line), it often means you’re not pregnant.

  2. If the test results reveal the control line and the test line, this may indicate a pregnancy, but it doesn’t necessarily have to be that way. The second line could be an evaporation line.

What is an Evaporation Line?

An evaporation line (evap line) is a slight streak that appears after a negative test has dried.

Basically pregnancy tests are meant to be read three to five minutes after they are taken when the tests are still damp at the time of reading.

This does not indicate that a woman is pregnant as the lines often occur when a person has checked the result too late or taken the test incorrectly.

When an evaporation line appears, it is best to take another test for an accurate result.

How to tell the difference: Faint positive test vs. Evaporation line

A mark on a home pregnancy test may be an evap line if:

  • More than 10 minutes have passed since taking the test.

  • The mark is faint and colorless, and it resembles a water spot.

  • The mark has no visible dye in it.

If the control line on the test does not change color, this means that the test is not valid and you should repeat the test with a new pregnancy test kit.

A line on a pregnancy test may show a positive result if:

  • You notice a visible dye in the line, even if the color is faint

  • The line appears within the period specified on the instructions, usually between 3-5 minutes.

  • A woman has taken a regular test at least 14 days after ovulation

  • A woman has missed her period.

Evaporation lines are usually avoidable if you follow the instructions on the test packaging. A simple way to help ensure accuracy is to take two tests.

This is why the most important rule for getting a true positive pregnancy test is:

“Do not read them after the allotted time!”

If you are still unsure of the interpretation of the results, talk to your doctor and get your blood tested.


Download our Doc2Us app from Google Play Store or Apple Store and chat with a doctor now.

References:

  1. Ernst, H. (2019). Evaporation line on a pregnancy test: What to know. [online] Medical News Today. Available at: https://www.medicalnewstoday.com/articles/322633.php.

  2. Liberto, R. (2019). The Difference Between a Positive Pregnancy Test & An Evap Line. [online] Ava. Available at: https://www.avawomen.com/avaworld/positive-pregnancy-tests-evap/.

  3. Weatherspoon, D. (2018). Evaporation Line Pregnancy Test: Positive or Negative?. [online] Healthline. Available at: https://www.healthline.com/health/pregnancy/evaporation-line-pregnancy-test#next-steps.

Image credits:

  1. https://amp.flo.health/uploads/media/sulu-1230x-inset/04/1214-Woman%20holding%20a%20pregnancy%20test.jpg?v=1-0&inline=1

  2. https://cf-images.us-east-1.prod.boltdns.net/v1/static/5966354423001/53df024f-c2ac-461a-bd6e-c4602e0c8c16/9e2dab11-0f21-4873-9dae-a3f23fb32dab/1280×720/match/image. jpg

  3. https://usercontent1.hubstatic.com/14004116_f520.jpg

  4. https://malcomabortionclinic.co.za/wp-content/uploads/2019/05/How-to-stop-unwanted-pregnancy-1.jpg

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  • evaporation line |
  • pregnancy test |
  • faint positive test |
  • human chorionic gonadotropin |
  • hcg

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Written by

Dr. Jeanrette J. Nierras

Heat and mass transfer during the evaporation of lying and suspended drops of a non-ideal solution.

Influence of environmental conditions

For the first time, a parametric study of the influence of such factors as temperature, humidity, and the flow velocity around a drop on the evaporation rate of a non-ideal ethanol-water solution in a wide range of concentrations of the volatile component was carried out. The data obtained will help refine the available mathematical models, and will also be useful for engineering assessments in the design of heat exchangers, cooling devices and advanced power plants using biofuels.

Using high-speed and thermal imaging, the dynamics of changes in the geometric parameters and temperatures of evaporating drops of water-alcohol solutions of various concentrations, suspended on a thread and lying on a flat surface, was studied.

Photo of drops and thermograms.

Comparison of data on evaporation dynamics with the results of mathematical modeling: points – experimental data, lines – calculations by S. S. Sazhin. 9(φ/17.5), where ¯τ=τ/τ_φ, where τ_φ is the evaporation time of a drop of the corresponding concentration at a relative air humidity of 95%.

Dependence of the dimensionless time of evaporation of drops of an aqueous solution of ethanol of different concentrations on air humidity.

Change in surface temperature of suspended droplets of a water-alcohol solution with ethanol concentration: 1 0% (water), 2 – 25%, 3 – 50%, 4 – 75%, 5 92%.

It is interesting to note that the effect of humidity on the evaporation rate is very strong even for ethanol droplets, which at first glance is doubtful. However, in this case, the droplet evaporation mechanism turns out to be rather complicated. At the first stage, ethanol evaporates, characterized by a low droplet temperature. Together with this process, water condenses from moist air onto a cold drop. As the ethanol evaporates, the temperature of the drop reaches a value corresponding to the adiabatic evaporation of water and, further, the evaporation process is close to the behavior of pure water. Obviously, the last phase is significantly limited by the high content of water vapor in the air.

IT SB RAS. Supervisor of the work — Terekhov Vladimir Viktorovich laboratory, Doctor of Physical and Mathematical Sciences, Professor of the Russian Academy of Sciences. Performers — Nizovtsev Mikhail Ivanovich laboratory, Doctor of Technical Sciences; Terekhov Viktor Ivanovich Chief Researcher, Doctor of Technical Sciences, Professor; Sterlyagov Aleksey Nikolaevich senior researcher, Ph.D.; Starinskaya Elena Mikhailovna junior researcher; Miskiv Nikolai Bogdanovich junior researcher Tel. +7 (383) 316-50-32.

Evaporative Lithography — Science

  • The science

Each of us can observe one interesting phenomenon at home. After the spilled drops of coffee, compote or cocoa dry, spots in the form of rings remain on the table. This observation raises the question: “What is the reason for this form of sediment?”

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Getty Images

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This phenomenon was actively studied by scientists in the late 1990s and early 2000s. And even now, publications on this topic continue to appear. Research in this direction at first was of a fundamental nature, as it was associated with an explanation of the phenomenon, which was called the «effect of coffee rings.» The point is that liquid evaporates faster near the periphery of the drop than in the central region. This leads to the appearance of a compensatory flow that carries the dissolved and suspended matter from the center of the drop to the contact line (liquid–substrate–air boundary).

In addition, precipitation of a different shape is possible: a uniform spot, concentric rings, a fractal structure, and many others. The appearance of the final deposit structure depends on many factors, for example, on the physicochemical properties of the substrate, solution, and air. Further research in this direction began to be of an applied nature. Such processes have proven important for a range of applications ranging from inkjet printing to medical diagnostics. A large group of methods for obtaining structured deposits, based on the natural process of drying drops and films, without any outside interference, is called «evaporation-induced self-assembly». Adding to the system the ability to control this process by external sources of influence makes it possible to achieve an even greater number of different forms of precipitation. A narrower direction is associated with the creation of conditions for an inhomogeneous vapor concentration near the free surface of the liquid. This relatively new and promising direction is called «evaporative lithography».

The essence of the method is to control the flow of liquid through the creation of conditions for uneven evaporation, which leads to the transfer of colloidal particles and the formation of a deposit of the required spatial shape. In addition, in some cases, external action (chemical or thermal) leads to sintering of particles and the formation of stable coatings. Evaporative lithography is a method based, as a rule, on a single-stage process, which does not require complex and expensive equipment, and is applicable to various materials and surfaces without pre-treatment.

Evaporative lithography methods can be divided into active and passive methods. In passive methods, the value of key parameters is set initially (the size of the hole in the mask placed above the free surface of the liquid; the width of the gap between the liquid and the mask; the initial concentration of particles or film thickness; the step between the holes of the mask; geometric parameters of the membrane through which the liquid is filtered and evaporated, and so on). Unlike passive methods, active methods are characterized by the presence of key parameters that can be adjusted in real time (the power of light radiation, the speed of air flow or substrate movement, and others). This allows you to dynamically influence the geometry of the formed structure. In a separate subgroup, hybrid methods can be distinguished, which combine evaporative lithography methods with other approaches related or not related to self-assembly caused by evaporation. This allows expanding the possibilities of evaporative lithography, which stimulates active research in this direction.

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Particle settling can be controlled by influencing evaporation of droplets and films

Photo:
K.S. Kolegov

Particle settling can be controlled by influencing evaporation of droplets and films

Photo:
K. S. Kolegov

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Particle settling can be controlled by influencing the evaporation of droplets and films

Photo:
K.S. Kolegov

Particle settling can be controlled by influencing the evaporation of droplets and films

Photo:
K.S. Kolegov

Along with experimental research, mathematical models are being developed and improved. Theoretical and numerical studies contribute to understanding the physical processes occurring in evaporative lithography. Modeling makes it possible to identify the key parameters of the system and helps in determining the range of parameter values ​​for effective control of the formation of sediment structures with the required geometric and physicochemical characteristics. Employees of the laboratory «Mathematical Modeling and Information Technologies in Science and Education» of the Astrakhan State University are now actively engaged in such tasks.

In the future, the results of research in this direction will allow in the future to learn how to effectively control the method of evaporative lithography, to obtain micro- and nanostructures of the desired shape with greater accuracy in size and area. The great interest in evaporative lithography is caused by many promising applications in various fields. We will mention only a few of them. The creation of transparent flexible electrically conductive films and organic transistors is extremely important for the problems of opto- and microelectronics.

By alexxlab

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