Most convenient Most common Preferable for Chemical Screen Microscopic examination
3. Postprandial : a specimen obtained 2 hours after meal . – Good for glucose determination 4. 24- Hour specimen - obtained within 24 hours . Necessary for quantitative tests, especially for quantitative determination of protein. Types of Specimen cont’d…
Types of Specimen cont’d… Collection of 24 hour Urine Specimen Procedure 1. Instruct patient to completely empty his bladder and discard his urine exactly at the beginning of the 24 hour time collection (let say at 6:00 a.m.). 2. Collect all urine voided during the following 24 hours, including that voided exactly at the end of the 24 hour period in a container (at 6:00 a.m.) of the following (second) day. 3. Provide the patient with appropriate type and amount of preservative. 4.The container should be labeled
Types of Specimen cont’d… 5. Clean Catch Urine can be collected by two ways: A) Mid- stream Specimen - a specimen obtained from the middle part of the first urine. commonly used for routine urinalysis. important for bacteriological urine culture. B) Catheterization is the process of passing a tube through the urethra to the bladder for the withdrawal of urine (it may introduce urinary tract infection).
Types of Specimen cont’d… The best method of ‘clean catch’ urine collected as follows: 1.The genital area should be cleaned with soap and water and rinsed well. This is to keep off bacteria on the skin from contaminating the urine specimen. 2.The patient should urinate a small amount and this is discarded. 3.The urine that comes next, the mid-stream specimen, should be collected into a sterile container of 30 to 50 ml. 4. After obtaining the specimen the patient continues to urinate and this is discarded.
Clean Catch Clean Catch
Types of Specimen cont’d… • Sources of Errors – Bacteriologically or chemically contaminated specimen such as detergent remnants in the container. – Wrong type/amount of preservative. – Partial loss of specimen or inclusion of two-morning specimen in the 24 hr collection. – Inadequate mixing of specimen before examination.
- Fall '19
- urine specimen