MERCY MEDICAL CENTER - pSMILE
|Author: Heidi Hanes |Document Number: |Pro64-E-01 |
| |Effective (or Post) Date: |13 January 2009 |
|Review History |Date of last review: |04 May 2020 |
| |Reviewed by: |Amy Rada |
|SOP should only be used as an example, change as needed. Items in red are suggestions. |
|pSMILE Comments: This document is provided as an example only. It must be revised to accurately reflect your lab’s specific processes |
|and/or specific protocol requirements. Users are encouraged to ensure compliance with local laws and study protocol policies when |
|considering the application of this document. If you have any questions contact your SMILE representative. |
Laboratory Name
Address
Department
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|TITLE: Cell Count On Body Fluids – by Manual Method |
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|Prepared By ________________________________ Date: __________________________ |
|Approved By ________________________________ Date: __________________________ |
|________________________________ Date: _________________________ |
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|Effective Date ________________________________ Discontinued Date: ____________________ |
|(retain this procedure for at least 2 years) |
|Supersedes an Earlier Procedure : (Y or N) Earlier Procedure Discontinuance Date:__________ |
| |
The Medical Laboratory Director or the Director’s designee should review all copies of this procedure at least once a year. Discontinued procedures must be retrievable in a reasonable timeframe.
|Reviewed By: |Date: |Reviewed By: |Date: |
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Laboratory Name
DEPARTMENT OF PATHOLOGY
HEMATOLOGY
CELL COUNT ON BODY FLUIDS – by Manual Method
COMMON FLUID TYPE CODES
JT JOINT
PL PLEURAL
PERI PERICARDIAL
PERT PERITONEAL
SYN SYNOVIAL
RKN RIGHT KNEE
LKN LEFT KNEE
KN KNEE
REL RIGHT ELBOW
PRINCIPLE:
Special diluting fluid is used to stain cells present in fluids. The diluted sample is introduced into a counting chamber and the number of erythrocytes and leukocytes are counted in a prescribed area. The number is then multiplied by an appropriate factor to obtain the number of erythrocytes and leukocytes per cm3 of body fluid.
CLINICAL UTILITY:
CSF fluid is obtained to assist in diagnosing central nervous system infection, tumors or vascular accidents. In Body fluids (pleural, peritoneal, synovial, etc.), results are used to determine whether a transudate due to increased hydrostatic or decreased plasma oncotic pressure; an exudate secondary to a wide variety of pleural diseases, e.g. increased capillary permeability, infection, infarction, rheumatoid disease, collagen disease; or secondary to malignancy.
SPECIMEN COLLECTION AND PREPARATION:
Good laboratory practice dictates that specimens should be processed as soon as possible.
The National Committee for Clinical Laboratory Standards (NCCLS) provides the following recommendations for handling, processing, and storing blood specimens:
Sterile preparation of spinal puncture site is necessary when collecting CSF. A non-traumatic tap using aseptic collection technique is required for all fluids. Sample should be placed in numbered glass or plastic tubes for CSF using order of draw for sequence. Body fluids may be collected in glass or plastic tubes using appropriate anticoagulant if necessary for analysis.
1. Storage requirements:
Room temperature (25o C) 1 hour
Refrigerator (2-8o C) 1 hour for CSF, 3 days for body fluids
After this time, distortion of morphology and cell lysis makes the specimen unsuitable for analysis
Freezer (-20o C) Not recommended for CSF. Supernatant from
centrifugation of other body fluids allowable for chemical analysis only, may be stored for up to 6 mos.
Some fluids may be delivered in a needle and syringe in order to maintain their integrity and sterility. Fluids received in such a way will be handled in the following manner:
a. If a culture is requested, Bacteriology will remove and discard the needle. The specimen will be transferred to a sterile screw cap tube and an EDTA vacutainer for further analysis. (Most chemistry analysis cannot be performed on EDTA samples).
b. If a culture is not requested, the first department receiving the specimen for analysis will perform the above step.
c. Specimens should be processed within one hour of collection. If there is a delay in analysis cells may start to deteriorate.
Rejection Criteria:
A specimen will be rejected if:
It is improperly labeled or unlabeled. In the case of fluids, an exception report must be completed and signed by the physician and an incident report form filled out and forwarded to the lab Quality Assurance representative.
3. Cell Counts.
Unless otherwise noted on the requisition, cell counts are performed on the last tube
in the numbered series. Generally, tube 3 or 4 represents the least traumatic tube. If the highest numerical tube visually appears more cellular than other tubes, the physician is called to inquire about tubes being drawn out of numerical sequence. A decision is then made as to which tube to count.
a. Perform count on last numbered (least traumatic) tube.
b. Note appearance of all requested tubes.
c. Testing is always performed on the tubes as follows unless stipulated other wise by physician:
Tube #1 – Chemistry orders
Tube #2 – Microbiology orders
Tube #3/4 – or last tube drawn – Cell Count
NOTE: Any fluid with flecks of material that may possibly be tissue should be referred to the Pathologist. He/she will determine whether to proceed with further testing on sample. (Histology may be required on this specimen). If after hours, preserve with formalin to maintain integrity. (See notes section.)
* CSF cell counts may be requested on more than 1 tube from a single lumbar puncture from the Emergency Department. If count is requested on more than one tube, on receipt the second tube requested should be placed on rotator for 2-4 min. Retain and refrigerate approximately 1 ml in original tube for further testing. Forward a well-mixed aliquot of tube #1 to next appropriate section (usually chemistry) for centrifugation and processing. (Fluid cannot sit for long periods before glucose, protein, etc. are performed). If original order for CSF includes two counts, call physician if RBC count from tube #3 or #4 is less than 20 RBC’s to see if second count is necessary.
** For CSF samples: if amount of fluid in tube #1 is less than 1 ml, chemistry tests can be performed on supernatant from tube #2 and tube #1 retained for additional count. If quantity of specimen is not enough for all test requested, physician should be called to decide which test should be performed.
Any request for additional cell count should be performed for Red Cells only.
SAFETY PRECAUTIONS:
ALL SAMPLES ARE POTENTIALLY INFECTIOUS AND MUST BE HANDLED WITH CARE AT ALL TIMES
REAGENTS:
Reagents are checked for contamination (fibrin or cells) before each use and re-filtered monthly.
All reagent containers are to be properly labeled with preparation, expiration date, storage temperature and tested date.
1. Crystal violet solution: Combine 0.2 gm crystal violet, 2 ml glacial acetic acid and 100 ml Type II deionized water in a brown bottle. (Only use this solution for 9:10 dilutions). Reagent is good for 1 year.
Warning: Crystal Violet is carcinogenic and an irritant to eyes, skin and mucous membrane. May alter genetic material. Wear impervious lab gown, protective gloves and eye/face protection. Do not breathe dust. See MSDS sheets for further information.
2. Methylene blue/saline solution Isotonic: Place 0.1 gm methylene blue in 100 ml volumetric flask
and dilute with 0.85% NaCl. Reagent is good for 1 year.
Warning: Methylene blue is a severe eye irritant. Avoid contact with eyes and skin. Do not ingest. Avoid inhalation. Wear impervious lab gown, protective gloves and eye/face protection. See MSDS sheet for further information.
3. Stock solution Buffered Sodium Chloride (10%) solution: Using a volumetric flask, dissolve 90 gm NaCl, 13. 66 gm Na2HP04, and 2.43 gms NaH2PO4..H20 in 1000 ml Type II deionized water. This solution is osmotically equivalent to 10% NaCl. It is stable in stoppered bottle for one year.
a. 1% Sodium Chloride Solution: Dilute the stock solution 1:10 by pipetting 10 ml stock solution into a 100 ml volumetric flask and dilute to the mark with Type II deionized water. Good for 1 year.
b. 0.30% Sodium Chloride Solution: Pipette 30.0 ml of 1 % Sodium Chloride solution into a
100 ml volumetric flask and dilute to the mark with Type II deionized water. Good for 1
year.
4. Hypotonic: Place 0.1 gm methylene blue in 100 ml volumetric flask and dilute with 0.30% NaCl. Reagent good for 1 year.
5. Turk's Solution: Combine 30 ml glacial acetic acid and 10 ml 1% aqueous gentian violet in a volumetric flask and dilute to the 1000 ml mark with Type II deionized water. Filter before use. Label bottle correctly with preparation date, expiration date and tested date. Turk' solution is good for 5 years.
NOTE: Glacial acetic acid is corrosive. Avoid contact with eyes and skin. Wear safety goggles and
face shield, impervious lab gown and protective gloves. See MSDS sheet for further information.
Crystal Violet is carcinogenic and an irritant to eyes, skin and mucous membranes. May alter genetic material. Wear impervious lab gown, protective gloves and eye/face protection. Do not breathe dust. See MSDS sheets for further information.
6. Gower's Solution: Using a volumetric flask, dissolve 62.5 gm sodium sulfate and 166.5 ml glacial acetic acid in 1000 ml Type II deionized water. Label properly with preparation date, expiration date and tested date. Gower's is good for 5 years.
WARNING Contains glacial acetic acid. Corrosive. Avoid contact with eyes and skin. Wear safety goggles and face shield, impervious lab gown and protective gloves. See MSDS sheets for further information.
7. Body Fluid Cell Count Controls: (Include description of the control, how many levels, stability information, such as storage and expiration date upon opening).
EQUIPMENT:
1. MLA Pipettes
2. Pipette tips
3. 10 x 75 test tubes
4. 16 x 100 mm test tubes
5. Gauze.
6. Hemocytometers.
7. Petri dishes.
8. Coverslips.
9. Mixer
QUALITY CONTROL
To monitor system performance and chart trends, at least one level of control must be run within any 8 hour period prior to running patient samples. If no fluid is performed, no QC is required. .Include commercially available control sera that cover at least two levels of analyte. Follow manufacturer’s instructions for reconstitution and storage. Quality control samples should also be assayed after maintenance or replacement of MLA pipettes. Treat all quality control samples the same as patient samples.
1. Refer to the quality control product insert or the suggested Expected Values. If the quality control results do not fall within the suggested Expected Values or within the laboratory’s established range, then perform the following:
a. Review the instructions to ensure that the assay was performed according to the procedures recommended by vendor.
b. Verify that the materials are not expired.
c. If necessary, rerun the quality control samples or contact control manufacturer for more assistance.
2. First fluid of the day:
a. Check log sheet in fluid area to see what level of control to be run. Alternate the level of QC per shifts run.
b. Remove control from refrigerator, it is not necessary to allow to warm to room temperature.
c. Mix control thoroughly by rapid inversion of the vial to ensure mixing to obtain reproducible results.
Make a 9/10 dilution of the control using Crystal Violet reagent as follows:
i. In a glass tube, pipette 450 ul of mixed control.
ii. In the same tube, pipette 50 ul of Crystal Violet.
iii. Allow to sit 1-5 minutes.
iv. Thoroughly mix and plate both sides of hemacytometer.
v. Allow to settle, count all 9 squares on both sides, enumerating nucleated and RBC.
vi. Calculate total cells and record results. Follow basic QC rules.
NOTE: Fluid dilutions for QC do not need to be made in duplicate. For patient fluids, duplicate dilutions should be made when fluid volume allows for it. Plate one of the dilutions on each side of the hemacytometer, results should match within 10%. If only one dilution can be performed, both sides of the hemacytometer should be counted and match within 10%.
PROCEDURE: (For all dilutions stated in procedure, see dilution chart following directions.)
1. Colorless Clear Fluid:
a. For Colorless clear fluids, a 9/10 dilution is used.
b. CSF - Crystal Violet is the diluting fluid of choice.
c. Other Body Fluids – 0.85% Methylene Blue dilution fluid is used
d. Allow dilution to sit for 2-3 minutes; mix before plating.
e. Fill both sides of counting chamber. Allow cells to settle out, see notes on settling.
f. Using the high power objective (43x dry):
g. Count all nucleated cells in entire ruled area (9 sq mm). For CSF differentiate nucleated cells if possible.
h. If 9 or less nucleated cells seen, a differential can be calculated from the chamber for CSF Fluids.
i. If more than 9 nucleated cells seen, perform a cytospin for differential count, see procedure on cytospin.
j. Count all erythrocytes in the entire ruled area (9sq mm)..
k. Use formula to calculate the number of nucleated cells and erythrocytes.
l. Report nucleated cells and erythrocytes in /MM3 and differential in percentage.
2. Hazy or slightly bloody fluids:
a. Diluting fluid of choice is 0.85% methylene blue.
b. Use a 1/10 dilution
c. Allow dilution to sit for 2-3 minutes; mix before plating.
d. Fill both sides of counting chamber. Allow cells to settle out, see notes on settling.
e. Using the high power objective (43x dry):
f. Enumerate both nucleated cells and erythrocytes on chamber. Counting area will depend on cell distribution. The more cells seen, the less area counted. (e.g. 4 large corner squares, entire middle squares or 5 small middle squares)
g. Make a cytospin slide to perform differential count.
h. Use formula to calculate the number of nucleated cells and erythrocytes.
i. Report nucleated cells and erythrocytes in /MM3 and differential in percentage.
3. Moderately bloody or cloudy fluid:
a. Diluting fluid of choice is 0.85% methylene blue
b. Use a 1/20 dilution
c. Follow steps c-i in step 2 above.
3. Very Bloody fluid:
a. Due to the high erythrocyte count two dilutions are necessary to achieve an accurate count for both cell lines.
b. For the erythrocyte dilution, the diluting fluid of choice is 0.85% methylene blue, using either a 1/100 or 1/200 dilution.
c. For nucleated cell the diluting fluid of choice in the 0.30% methylene blue (hypotonic solution) using either a 1/10 or 1/20 dilution.
d. Allow dilutions to sit for 2-3 minutes.
e. Fill 2 separate chambers with mixed diluted fluid, allow settling.
f. Use high power objective (43x dry).
g. For erythrocyte dilution count either the entire middle square or 5 little squares, depending on cell distribution.
h. For nucleated dilution count either all 9 squares or 4 corner squares, depending on cell distribution.
i. Make a cytospin slide to perform differential.
j. Use formula to calculate both the nucleated cells and erythrocyte counts.
k. Report nucleated cells and erythrocytes in /MM3 and differential in percentage.
NOTE: Gowers or Turk's solutions can be used for the erythrocyte and nucleated cell counts, but due the proteinous nature of fluids the acetic acid will cause precipitation, making counting difficult to perform.
Dilution Procedure:
Dilution Required Amount of Sample Amount of diluting fluid
1:10 100 ul 0.9 ml
1:20 100 ul 1.9 ml
1:100 100 ul 9.9 ml
1:200 50 ul 9.95ml
9:10 0.9 ml (450 ul) 100 ul (50 ul)
Mix dilution well, allow to sit 1-5 minutes, fill hemacytometer and follow directions based on fluid appearance for counting and calculations:
Alternate dilutions:
1. For clear to slightly cloudy fluids with a final dilution of ½:
a. Dilute specimen 1:2 with appropriate diluting fluid. (0.2ml specimen to 0.2 ml diluent).
b. Mix in a glass tube and allow to sit 1-5 minutes.
c. Fill hemacytometer and count the appropriate area.
d. Calculate as follows multiplying cells counted:
18 squares - multiply by 1.1
9 squares - multiply by 2.2
4 squares - multiply by 5
1 square - multiply by 20
5 small squares multiply by 100
2. For moderately cloudy fluids with a final dilution 1/20:
a. Dilute specimen 1: 10 with normal saline or Coulter Isoton (0.1 ml of specimen to 0.9 ml diluent).
b. From the above dilution, make an additional dilution 1:2 with appropriate fluid reagent (0.2ml of dilution to 0.2 ml of diluent).
c. Mix in a glass tube and allow to sit 1-5 minutes. Fill hemacytometer and count appropriate area.
d. Calculate as follows:
18 squares - multiply by 11
9 squares - multiply by 22
4 squares - multiply by 50
1 square - multiply by 200
5 small squares - multiply by 1000
3. For very cloudy or bloody fluids requiring a final dilution of 1/200
a. Dilute specimen 1:100 with saline or Isoton (0.1 ml of specimen to 9.9 diluent).
b. From the above dilution, make an additional dilution 1:2 using the appropriate diluting reagent (0.2 ml to 0.2 diluting fluid).
c. Mix in glass tube and allow to sit 1-5 minutes. Fill hemacytometer and count appropriate area.
d. To calculate:
18squares multiply by 110
9 squares multiply by 220
4 squares multiply by 500
1 square multiply by 2000
5 small squares multiply by 10,000
CALCULATIONS:
1. Erythrocyte and leukocyte counts should be performed within 30-60 minutes after the specimen is received because cells lyse on prolonged standing yielding inaccurate counts.
2. Alternate dilution procedures serve as guideline. However, due to variability in cell number, it may sometimes be necessary to increase the dilution and/or decrease the area counted in order to
facilitate counting. Common sense judgements should be the rule and a factor calculated for the revised dilution and/or area counted using the following formula:
1 x Reciprocal of dilution = Factor
Area counted X Depth (0.1 mm)
Multiply cells counted by factor for final concentration.
When counting Body Fluids, scan entire GRID (low power) to confirm even distribution. Alter the area based on cellularity of fluid.
All 9 squares = 9 mm2
Complete Center Square =1 mm2
Center square has 25 smaller squares- One small square in center square = 0.04 mm2
Five small squares in center square = 0.2 mm2
3. When counting RBC and WBC on chamber, identifying WBC may be useful as guide to what to expect on smear.
EXPECTED RESULTS: CSF should be clear and watery. Other body fluids can be clear or a straw to yellow color. In all fluids, turbidity may be caused by leukocytes, erythrocytes, micro-organisms, or by contrast media. A pink to orange color represents xanthrochromia from the breakdown of RBC.
Cell Counts in Normal Fluids:
CSF:
RBC 0-2/cmm3
WBC - Adults 0-5/cmm3
Neonates 0-30/cmm3
Synovial: RBC 0-2000/cmm3
WBC ................
................
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