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Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 51 Booth, Wallace, and Fitzgerald PowerPoint Presentation.

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Presentation on theme: "Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 51 Booth, Wallace, and Fitzgerald PowerPoint Presentation."— Presentation transcript:

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2 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 51 Booth, Wallace, and Fitzgerald PowerPoint Presentation to Accompany PowerPoint ® Presentation to Accompany

3 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 52 Specimen Processing

4 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 53 Objectives Upon completion of this chapter, you should be able to: List requirements for special specimen handling procedures. Describe the technique required for collecting blood cultures. List the steps for Unopette ® collection. Describe the procedure for performing a microhematocrit.

5 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 54 Objectives cont’d Explain the collection process and procedure for making a peripheral blood smear. Discuss common point-of-care and CLIA waived tests. Explain the procedure for urine specimen collection and reagent testing. Identify safety requirements for operating a centrifuge.

6 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 55 Special Handling Procedures In addition to blood collection, some specimens require special handling either before or after the blood is collected. Common Tests Requiring Special Handling Procedures Blood Cultures Cold Agglutinins Chilled and Light-Sensitive Legal Specimens

7 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 56 Blood Cultures Requested on patients with a high fever Purpose is to isolate microorganisms from the patient’s blood that may be causing the fever Strict aseptic technique is required for the collection of the blood specimen Blood culture bottles are larger than normal venipuncture tubes

8 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 57 Blood Cultures Part 2 Blood culture bottles contain culture media, which enhances the growth of the microorganisms Septicemia is the presence of microorganisms in the blood with symptoms that can result in death Blood cultures are usually ordered STAT Collected in sets of two or three Each set is collected from different sites at different time intervals One sample will be incubated as an anaerobic specimen and the other as an aerobic specimen

9 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 58 Blood Cultures Part 3 Blood cultures seek to identify the agent(s) responsible for the patient’s illness Common Pathogen Classifications Bacteria Fungi Protozoa Viruses

10 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 59 Blood Culture Volume The exact amount indicated by the manufacturer must be collected. Usually 8 to 10 mL per bottle or tube is sufficient for an adult. Lesser amounts are drawn on infants and children. The correct amount is needed to increase the chance of bacterial growth.

11 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 510 Blood Cultures Part 4 The collection of blood cultures is essentially the same as for routine venipuncture, except: Amount of blood needed Special site cleansing Specimen transfer

12 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 511 Site Cleaning Procedure Blood Culture Site Cleaning Procedure Steps to Correct Cleaning 1.Release the tourniquet after site is selected 2.Clean first with 70% to 95% alcohol, chlorhexidine gluconate, or benzalkonium chloride using concentric circles, from the center working outward 3.Do not allow the strokes to go back toward the center area Correct cleaning of the site is the most important part of collecting blood cultures

13 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 512 Site Cleaning Procedure Cont’d Steps to Correct Cleaning (cont’d) 4.Allow the site to air dry 5.Repeat cleansing using a 2% iodine swab or applicator if using alcohol 6.Allow iodine to dry and do not retouch the area If the patient is allergic to iodine, use another cleanser.

14 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 513 Blood Culture Specimen Transfer Collecting Blood Culture Specimens If using a syringe, be sure to have a syringe that can hold at least 20 mL. Attach the syringe to a transfer device and fill anaerobic bottles first. If a butterfly setup is used, the aerobic sample is drawn first so that air from the butterfly tubing is cleared before the anaerobic culture sample is drawn.

15 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 514 These specimens must be correctly identified and under the uninterrupted control of authorized personnel to ensure their validity. Establishing a chain of custody is required for medicolegal issues. Without proper proof of custody, the specimen will be considered invalid. A chain of custody form must be completed correctly, and multiple copies are used as a safeguard system.

16 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 515 Cold Agglutinins Testing for cold agglutinins or antibodies is done for patients suspected of having atypical pneumonia. Atypical pneumonia is caused by the microorganism Mycoplasma pneumoniae. People infected with Mycoplasma pneumoniae produce autoantibodies.

17 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 516 Cold Agglutinins Part 2 Normal body temperatures range from 97.6  F to 99.6  F. At temperatures lower than normal body temperature, cold agglutinins attach to red blood cells and cause clumping. Specimen Collection Use red-topped tubes that do not contain additives Collection tubes must be prewarmed Keep the sample at 98.6  F until the serum can be separated from the cells Serum must be separated from cells within 1 hour

18 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 517 Some specimens must be chilled or covered immediately after collecting. Chilled Specimens Arterial blood gases Ammonia Lactic acid Light-Sensitive Specimens Bilirubin

19 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 518 Apply Your Knowledge Part 2 Which of the following best describes the correct cleansing procedure for blood culture collection? A. Clean the arm starting a distance from the site and clean toward the selected site B.Use linear strokes to clean up and down the arm until the entire arm is cleansed C.Clean the site starting in the center and working outward Answer: C. Clean the site starting in the center and working outward GREAT!

20 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 519 Apply Your Knowledge Part 3 James is suspected of having atypical pneumonia. Which of the following tests will most likely be ordered? A. Arterial blood gases B. Cold agglutinin C. Bilirubin Answer: B. Cold agglutinin tests for atypical pneumonia caused by Mycoplasma pneumoniae BRAVO!

21 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 520 Unopette Procedure A Unopette ®, manufactured by Becton-Dickinson, is a prepackaged microcollection device. Disposable Consists of a plastic reservoir containing a premeasured volume of reagent Common Tests Performed with a Unopette White blood cell count Red blood cell count RBC fragility Platelet count Hemoglobin

22 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 521 Unopette Procedure Part 2 Each test requires a specific Unopette that has a different premeasured volume of reagent inside. Specific pipettes accompany each Unopette. Pipettes are self-filling, thin-walled, glass capillary tubes attached to a plastic holder. Use a dermal puncture specimen to fill the pipette. Wipe the pipette after it fills with blood, but do not touch the end of the pipette with gauze. Gently invert to mix the sample with the reagent. Label Unopette and transport to lab.

23 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 522 Apply Your Knowledge Which tests can be performed with the Unopette microcollection device? ANSWER: WBC count, RBC count, RBC fragility, platelet count and hemoglobin Good Job!

24 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 523 Measuring Microhematocrit Microhematocrit tubes are used for measuring hematocrit or packed cell volume They have a thin red band around the end of the tube These tubes are coated with sodium heparin Blood flows freely into these tubes because of capillary action

25 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 524 Measuring Microhematocrit Part 2 Fill two capillary tubes 3/4 full Seal the end that was not used to collect the specimen by embedding the clean end into a clay sealant (if the tube requires it) Place in a separate tube for labeling and transporting to the laboratory Place in centrifuge machine according to procedure NOTE: The values of the two microhematocrits should match within 2 percent.

26 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 525 Apply Your Knowledge Part 6 True or False: Microhematocrit tubes are coated with an anticoagulant. Hey, remember! An anticoagulant prevents blood from clotting. Answer: True Great!

27 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 526 Peripheral Blood Smear A blood smear is for the microscopic examination of blood. Venous or capillary blood may be used to prepare a blood smear. The complete blood count (CBC) differential test is done with a blood smear. Blood smears are also used to diagnose malaria, anemia, and leukemia.

28 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 527 Peripheral Blood Smear Part 2 Blood Smear Procedure Fresh drops of blood are obtained, usually following dermal puncture Wipe away the first drop of blood Place 1 drop of blood about 1/2 inch from the frosted end of one glass slide Hold the spreader slide at a 30  to 35 o angle and spread blood toward the opposite end of the slide The blood smear should be smooth in appearance with no irregularities, streaks, or holes and a feathered edge The wedge method is the most common technique for making blood smears

29 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 528 Apply Your Knowledge Blood smears are used to diagnose which of the following diseases? A.Malaria B.Leukemia C.Anemia D.All of the above E.None of the above ANSWER: D. All of the above Bravo!

30 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 529 Point-of-Care Testing Near-patient testing Designed to reduce hospital cost and reduce turnaround time for blood test results Instruments are portable, internally calibrated, and easy to use Point-of-Care testing (POCT) is usually performed by phlebotomists, nurses, technicians, or medical assistants Dermal puncture usually done because a small blood specimen is needed Each instrument must be calibrated and requires quality control checks

31 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 530 Point-of-Care Testing Part 2 Glucose Hemoglobin Sodium Potassium Bicarbonate Ionized calcium Cholesterol Blood ketones Urine dipstick PT and PTT Chloride Blood gases Common Point-of-Care Tests

32 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 531 Often requires blood from a dermal puncture. POCT is done at various facilities. If a clinical lab is not available, only CLIA waived testing can be performed. CLIA waived tests are those that are cleared for home use.

33 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 532 Before the Test Confirm test orders Establish a procedure for patient ID Give patient pre-test instructions Collect specimens according to package directions Label specimens appropriately Never use expired kits

34 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 533 During the Test Perform quality control testing Correct any problems Establish a policy for frequency of control testing Carefully follow all test-timing recommendations Interpret test results using product inserts as a guide Record test results according to office policy

35 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 534 After the Test Report results in a timely manner Follow package insert for follow-up Follow OSHA regulations for disposing of biohazardous waste Participate in quality assurance assessment programs

36 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 535 Apply Your Knowledge Part 7 Which of the following tests cannot be performed with POCT? A. Glucose B. Hemoglobin C. Blood culture D. Cholesterol Answer: C. Blood cultures require a larger amount of blood and have to grow in culture media. Good Job!

37 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 536 Used to evaluated substances found in urine Consist of the physical component, chemical component, and the microscopic component First morning urine is best used for testing Chain of custody must be established for drug and alcohol testing Should be refrigerated if not tested within 1 hour

38 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 537 Obtaining Urine Specimens For a Female: Separate the skin folds and wipe front to back three times Keep the skin folds apart and collect a midstream urine in the cup Once ¾ full, place the lid on the cup Label the specimen For a Male: Use 2 towelettes to clean the head of the penis If uncircumcised, keep foreskin retracted while patient urinates and collect a midstream urine in the cup Once ¾ full, place the lid on the cup Label the specimen

39 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 538 Urine Specimen Testing The Urine Dipstick Uses reagent strips to test urine for a number of substances Keep strips in a cool dry area Never remove them from the container until ready to test Examine the strips for discoloration Check the expiration date Always run a control sample when opening a new supply Write the date opened Follow the manufacturer’s directions for accurate results

40 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 539 Apply Your Knowledge Which is the best urine specimen for testing? ANSWER: The first morning urine GREAT!

41 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 540 Centrifuge Operation Centrifuging is the spinning down or separating of cells from the liquid portion of the blood. Specimens also require aliquoting (dividing specimens into separate containers) Aliquoting for most laboratory tests requiring serum or plasma must be done within two hours or less What happens if the specimen is not separated in time? Test results could be altered If the RBCs are left in contact with the serum, the glucose level would be decreased

42 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 541 Centrifuge Operation Part 2 Types of Centrifuges Refrigerated Floor models Tabletop models The speed of rotation and the radius of the rotor head determine the relative centrifugal force of a centrifuge, which is expressed in gravity (g). Most laboratory specimens are centrifuged at 750 to 1000 g for 15 minutes

43 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 542 Centrifuge Operation Part 3 Place tubes of equal size and volume directly across from each other so the machine will be balanced Never open the lid until the centrifuge machine has come to a complete stop After centrifugation, always be sure the transfer tube is properly labeled before you begin to aliquot a specimen

44 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 543 Apply Your Knowledge Within what time frame should specimens be centrifuged for tests that require serum or plasma? ANSWER: Within 2 hours GREAT!

45 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 544 CHAPTER SUMMARY Specimens may require special handling or collection in order to be accurate. Blood cultures must be drawn under strict aseptic technique to prevent false results. When using a Unopette, collect the specimen with the pipette and mix the specimen carefully. To perform a microhematocrit, obtain blood in a capillary tube and centrifuge. The separated cells can be used to determine the patient’s hematocrit.

46 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 545 CHAPTER SUMMARY (cont’d) Peripheral blood smears require a drop of blood on a slide. The blood is spread across the slide using a spreader slide. Point-of-care tests are obtained and tested immediately at the point of care or near the patient. CLIA waived tests pose a minimal risk to the patient. A urine specimen can be collected and a reagent strip may be used to determine the concentration of a substance. When using a centrifuge, make sure the load is balanced.

47 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 546 END OF CHAPTER 5 Choose a job you love and you will never have to work a day in your life. -- Confucius


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