There are several options for analysis:
• Determination of daily diuresis, with the help of which it will become clear whether fluid is retained in the body. The study is prescribed for pronounced and latent edema, late toxicosis.
• Examination of daily urine for protein loss. It is prescribed for suspected preeclampsia - late toxicosis, nephropathy of pregnant women.
• Daily urinalysis to study the glucosuric profile. Needed to assess carbohydrate metabolism, if gestational diabetes mellitus is suspected.
• Urine sample according to the Zimnitsky method. It determines the daily diuresis, day and night. Normally, daytime diuresis predominates over nighttime.
Before you start collecting the daily urine of a pregnant woman, you need to purchase a special container with a volume of 2 liters at the pharmacy.
It should be drained into it all the urine collected during the day. The entire collected volume will not be needed for analysis - for research it is necessary to pour 100–150 ml from the total volume into a plastic container (after stirring well). In some cases, the analysis requires all the urine excreted per day (an obstetrician-gynecologist will warn you about this).
Between the time of collection of the last portion and the receipt of urine in the laboratory, no more than 2 hours should pass. Otherwise, the results may be unreliable.
There are special kits on sale to make it easier to collect and properly store daily urine. They consist of:
• graduated container;
• transfer tube with a needle at the end;
• a transport test tube - in it the biomaterial is delivered for analysis.
Before going to the toilet, it is necessary to thoroughly wash yourself so that part of the vaginal microflora does not end up in the urinal, which can distort the result. To prevent the entry of vaginal discharge into the samples, during urination, the entrance to the vagina is covered with cotton wool.