1. Sample Integrity Lecture 2
Quality Assurance
Sample Integrity
Lecture 2

2. A test result is no better than the quality of the specimen received in the laboratory
A poor quality specimen will probably produce an inaccurate and potentially dangerous result
Blood and other body fluids removed from the body start to change immediately
Precautions must be taken to minimize these changes and to ensure that the test result will accurately reflect the physiologic and pathologic state of the patient
Lab. is responsible for the test result and therefore is obliged to take precautions so that a good-quality sample is received

3. When all of the following criteria are fulfilled, the sample received in the lab. will be of good diagnostic value
Specimen collection procedure is clearly defined
When concisely designed requisition and report forms are used
Proper method of collection, transportation, processing and storage are provided

4. Specimen Collection Manual
The Specimen Collection Manual is important in that it provides written instructions for the proper and adequate collection of specimens capable of giving timely and medically important data
Many times the collection of specimens may be beyond the laboratory's control as nurses, medical students, and physicians will be responsible for the acquisition of the specimen
A complete and up-to-date collection procedure manual, covering every test that the laboratory offers, should be distributed to all collection and nurses stations

5. Specimen Collection Manual
Laboratory personnel are responsible for
for training other personnel involved in specimen collection and transport and for communicating effectively in order to maintain optimal quality of specimens for laboratory testing
minimizing preanalytical errors based on acceptance or rejection of the received specimens
Since preanalytical errors seem to make up the majority of most laboratory test problems, proper training is an important area to address

6. The Specimen Collection Manual (in brief)
Test name with alternate names and commonly used abbreviations
Patient preparation
Nature of specimen
Specimen timing for collection
Preservative or anticoagulant
Special handling between collection time and delivery to the laboratory
Labeling requirements
Required requisition
Criteria for unacceptable specimens
Performing laboratory's phone number and hours of operation

7. Specimen Collection Manual Contents
The manual should contain the following information for each test
1- Test Name:
The name of each test with alternate names and commonly used abbreviations are listed in alphabetical or some other logical order
Some tests are referred to by more than one name or by their initials
An example would be SGPT, GPT, serum glutamic pyruvic transaminase, ALT, or alanine aminotransferase—all referring to the same enzyme
2- Patient preparation:
How the patient should be prepared prior to collection of the sample should be detailed here
For example, should the patient be fasting or two hours prandial; be sitting or recumbent

8. Specimen Collection Manual Contents
3- Nature of specimen:
The type of material to be collected should be clearly indicated
Blood, urine, some other body fluid, or tissue sample should be clearly stated as the preferred specimen
4- Special timing for collection:
Should the sample be a random one or timed to coincide with the administration of a drug or with some pathologic event?
This is especially important when looking for specific responses to treatment
such as a glucose tolerance test, antibiotic, anti-convulsant, or antiarrhythmic drugs

9. Specimen Collection Manual Contents
5- Preservative or anticoagulant:
To maintain the specimen in an acceptable state, it may be necessary to use an anticoagulant, preservative, or even to store the specimen on melting ice or ice water
6- Transportation requirements:
Special handling between the collection time and delivery to the laboratory may be required.
Chemicals can be altered, microorganisms die, and the specimen altered if improperly handled during transportation.
Transportation considerations include:
Time
Temperature
Exposure to light
Excessive vibration and rough handling

10. Specimen Collection Manual Contents
7 Labeling procedures:
Specific requirements for labeling the sample should he clearly defined
A minimum of patient name, identification number, collector's initials, and the date and time of collection should be labeled on the sample
Some specimens will require more information:
Microbiological specimens need to have site of the sample included
A blood sample collected for crossmatching needs to be exactly and correctly labeled for acceptance

11. Specimen Collection Manual Contents
8- Required requisition:
Specific requisitions with test names and reference ranges will help in processing the result
9- Criteria for unacceptable specimens:
A description of unacceptable specimens may prevent the improper collection
10- Performing laboratory:
Each test should be listed with the phone number and hours of operation of the performing laboratory
If the physicians and nursing staff who will collect the samples know where the samples should go and the hours of operation of the performing laboratory, then improperly timed specimens may be avoided

12. Sample Rejection
A specimen should be rejected for any of the following reasons:
a- Inadequate or improper labeling:
Sample tubes or collection containers with no label or the wrong name should not be accepted
b- Inadequate sample volume for amount of additive used:
If less than the required volume of blood is collected, there will be an excessive amount of additive that may affect the accuracy of the test result.
For example, too much liquid anticoagulant relative to the blood volume will result in a dilution error for prothrombin time in any sample collected in a citrated tube

13. Sample Rejection c- Improper collection tube or container:
Certain tests require specific anticoagulants or preservatives to maintain the integrity of the specimen
The wrong additive can have a detrimental effect on the specimen, resulting in an inaccurate result
d- Improper transportation:
Specimens received in the laboratory that have been improperly transported should be rejected.
Examples include:
samples that should be chilled during transport but that are received at room temperature
or specimens for anaerobic culture that are received after being exposed to air

14. Sample Rejection e- Hemolysis:
Cell counts and certain chemistry analyses (e.g., potassium or LD) will be adversely affected by the lysis of red cells.
Hemolysis may result from a difficult venipuncture or from too vigorous handling.
A new sample should be requested

15. Additional Information
In addition to the collection manual, the laboratory should provide for the nursing and medical staffs information on laboratory operations
This information will facilitate smooth test ordering, result reporting, and communication between the laboratory and users of its services
This information can be included as an introduction to the collection manual

16. Additional Information
Discuss the method by which to order tests from the laboratory, including directions for ordering, both by manual and by electronic methods
Include a list of tests offered by the laboratory
Provide information on how to request test results
Include telephone numbers to call and hours of operation for each department of the laboratory
Present a list of the tests that are routine or stat (urgent)
Include a list of reference intervals
Describe the proper disposal procedures of needles and syringes
list the proper collection procedure for infectious patients
Include color key for vacuum tubes, describe the additive used for each test

17. Interaction With Patients and Other Hospital Personnel
Many times the only contact the public has with laboratory personnel is the phlebotomist at the time of sample collection
It is important that the collector present a professional appearance and have a courteous manner when approaching a patient
The collector must clearly communicate to the patient who he is, why he is there, and what is required of the patient
A relaxed and cooperative patient will more likely provide an adequate specimen and correct information

18. Interaction With Patients and Other Hospital Personnel
The phlebotomist must "realize that he is an integral-part of the health-care team
An attitude of cooperation with the doctors, nurses, and other health-care professionals is necessary to provide high-quality health care
Unclear instructions, duplicate orders, or conflicting orders should be clarified or questioned before processing
Unusual circumstances and significant events or happenings should be reported to the nursing staff so as not to jeopardize the patient's health

19. The Collection Process
The first step in the collection process, be it venipuncture, urine collection, or throat swab, is the proper identification of the patient
Outpatients should be asked for their name, not "Are you Mrs. Ali?“
An inpatient's identification bracelet should be matched with the Specimen Request Form for name and hospital ID number
Misidentification of the name of the patient from which the specimen is received may result in the improper treatment to the wrong patient

20. The Collection Process
Proper selection of the collection site is important in obtaining a valid sample
Certain blood chemistries have different concentrations in the arterial as compared to the venous blood
Sites of infection need, to be properly sampled when collecting culture material
The proper collection equipment and procedures are vital for obtaining a valid sample
A listing of materials and their proper use should be outlined in the collection manual in detail and included in the procedure manual
The training checklist should include the use of the equipment

21. The Collection Process- Sample Labeling
The specimen should be labeled with the patient's name, history number, date and time of collection, and the initials of the person collecting the sample
This information should be identical to that on the test requisition
If there is a discrepancy between the name or history number on the sample label and that on the requisition, the sample should not be processed until the difference is resolved
Some samples, especially those to be used for crossmatches, should not be considered properly labeled unless the collector's initials and the date and time of collection are on the sample

22. The Collection Process- Sample Labeling
But there are exceptions to some rules:
In cases of extreme medical emergency, labeling protocol may be temporarily waived
If one can be certain that the problem is a clerical rather than a substantive one, it would be improper to withhold results in a medical emergency just because the sample was not properly labeled
Hard-to-collect samples, such as cerebrospinal fluid, are sometimes received unlabeled
Delay in performing cell counts or culturing may result in the destruction of significant cells or microorganisms.
In cases such as this, a decision must be made whether to process the specimen while attempting to identify it properly or to request another specimen
Withholding the results on the specimen until positive identification ofthe source is one method of preventing incorrect reporting

23. The Collection Process- Sample Accessioning System
Once the sample and the requisition have reached the laboratory it should be processed immediately
At some point the sample and the requisition will be separated
A sample accessioning system provides a means of keeping the specimen and the requisition together
As it enters the laboratory each sample is assigned a unique number
That number is also placed on the accompanying requisition
As the sample and requisition become separated during the sample preparation process, it is by this number that the two can be united again
In laboratories utilizing computer systems to report results, the accessioning number is used to log the test request into the laboratory and to report the results in the laboratory computer system

24. The Report Form
In many institutions the test requisition also serves as the test report form, especially in hospitals that are not served by a hospital computer system
The report form includes much of the same information that the test request form contains.
The report form should have the following information:
Date and time the specimen was collected
Patient name and history number
Date and time the specimen was received in the laboratory
Patient location
Date and time of the analysis
Patient diagnosis
Results of the analysis
Name of the ordered test
Ordering physician