What happens when HCl is added to urine?

Addition of HCl to urine samples does not affect urea and creatinine measurements. At low HCl concentrations, urine sodium and potassium measurements are not affected. However, urinary measurements of protein and albumin should be avoided in samples with HCl added.

For which test 24 hr urine collection requires HCl as preservative?

Test specific preservatives for Urine collection.

Test Name Order Name Alternate Preservatives
ALBUMIN (Microalbumin) 24Hr ALBUM24U NONE
ALDOSTERONE 24hr URINE ALDOS 24 U Refrigeration, 25mL 6N HCL
AMINOLEVULINIC ACID 24Hr DELT ALA24 NONE
CALCIUM (12 OR 24Hr URINE) CALC TM U 25mL 6N HCL, 10gm BORIC ACID

What is the acid in a 24 hour urine test?

Your doctor has requested that you have a test on a sample of urine collected over a 24-hour period. The bottle used for this collection contains boric acid. Do not discard this—it is used as a preservative.

What is the additive used in a 24 hour urine collection?

In both the inpatient and outpatient settings, the laboratory has supplied 24 hour urine containers with preservative such as acetic acid, sodium hydroxide, and boric acid.

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.

Does a 24-hour urine need to be refrigerated?

You don’t have to refrigerate it. Make sure to drink at least 8 (8-ounce) glasses of liquids during your 24-hour collection period.

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

What is the best urine preservative?

The commonly used urine preservatives include boric acid, hydrochloric acid, acetic acid, and oxalic acid. Certain buffers and bicarbonate salts may also be used for specific measurands.

What can you not do on a 24 hour urine collection?

For 24 hours prior to collecting the specimen, you should avoid strenuous exercise as well as the following substances and drugs:

  • Acetaminophen.
  • Alcohol.
  • Antihistamines.
  • Aspirin.
  • Caffeine.
  • Vitamin B.

Do you need to refrigerate a 24 hour urine collection?

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.