Why is the first voided urine discarded in a 24 hour urine collection?

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Why is the first voided urine discarded in a 24 hour urine collection?

Urine values vary considerably during a 24-hour period, and most test methods are based on normal values for first morning samples. The first urine voided in the morning is preferred because it has a more uniform volume and concentration and a lower pH, which helps preserve the formed elements.

What is considered the first morning urine?

The first morning urine is the urine you void when you get up for the day. If you get up during the night, it is not necessary to catch that urine. You can wait until you get up for the day. For women who work night shift, your first morning urine will be the urine you void after you slept during the day.

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How much urine should you pass in 24 hours?

The normal range for 24-hour urine volume is 800 to 2,000 milliliters per day (with a normal fluid intake of about 2 liters per day).

Is first or second morning urine better?

Why? While you’re sleeping, hCG becomes more concentrated in your urine. Unless you wake up in the middle of the night to pee, first thing in the morning is the best time for early detection of pregnancy.

Is 4am considered first morning urine?

For women who work night shift, your first morning urine will be the urine you void after you slept during the day. For example, if you get off work at 7:00am and sleep from 10:00am to 6:00pm, your first morning urine will be the first urine you void when you wake up for the day at 6:00pm.

How do you collect a 24-hour urine sample?

A 24-hour urine sample is needed:

  1. On day 1, urinate into the toilet when you get up in the morning.
  2. Afterward, collect all urine in a special container for the next 24 hours.
  3. On day 2, urinate into the container when you get up in the morning.
  4. Cap the container.
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How do you use a PT strip at home?

For most home pregnancy tests, you either hold a test strip in your urine stream as you urinate into the toilet or you collect your urine in a clean cup and dip your test strip into the cup. If you are pregnant, most test strips produce a colored line, but this will depend on the brand you purchased.