M6: Synovial fluid Flashcards
Synovial fluid
All statements are correct about synovial fluid except one.
A. Viscous liquid found in the cavities of movable joints.
B. Diarthroses
C. Provides nutrients directly to the bones in a joint.
D. Serves as a lubricant to reduce friction.
C
provide nutrients to the articular cartilage
inamo wakin, magsamasama kau
Synovial fluid is often referred to as?
joint fluid
bones in the synovial joints are lined with
smooth articular cartilage
Bones are separated by a cavity containing the
synovial fluid
All statements are correct about synovial fluid except one.
A. Joint is enclosed in a fibrous joint capsule, lined by cartilage and lubricated by synovial membrane fluid.
B. Type A cells are macrophage-like cells located in the
superficial layer.
C. Type B cells are fibroblast-like cells that produce hyaluronic
acid fibronectin, and collagen.
D. Provides nutrients to the articular cartilage.
A
- cartilage lining should actually be the synovial membrane lining the capsule
- synovial fluid is responsible for lubrication, not synovial membrane fluid.
TOF. Synovial fluid is formed as an ultrafiltrate of plasma across the articular cartilage.
F (formed as an ultrafiltrate of plasma across the synovial membrane)
All are correct except:
A. The filtration is nonselective except for the exclusion of high-molecular-weight proteins.
B. Most of the chemical constituents, although
seldom of clinical significance, have concentrations similar to plasma values.
C. They provide nutrients for the vascular-deficient cartilage.
D. Lessens the shock of joint friction that occurs during activities such as sitting and standing
D
- shock from compression, not friction
- impact activities, not sitting and standing
NORMAL SYNOVIAL FLUID VALUES
TOF. 4.5 mL volume of synovial
F (<3.5)
NORMAL SYNOVIAL FLUID VALUES
TOF. Varies from being entirely transparent to a faint shade reminiscent of yellow
Normal Color
T
thx chatgpt
NORMAL SYNOVIAL FLUID VALUES
Clarity
Clear
NORMAL SYNOVIAL FLUID VALUES
Viscosity
Able to form a string 4 to 6 cm long
NORMAL SYNOVIAL FLUID VALUES
TOF. Leukocyte count 4,000 - 6,000
F (<200 cell/uL)
None present
NORMAL SYNOVIAL FLUID VALUES
TOF. Neutrophils: <25%
T
NORMAL SYNOVIAL FLUID VALUES
TOF. Glucose: Plasma
difference: <20 mg/dL lower than the blood glucose level
F (10)
NORMAL SYNOVIAL FLUID VALUES
Total protein
<3 g/dL
SPECIMEN COLLECTION AND HANDLING
Synovial fluid is collected by needle aspiration called
arthrocentesis
TOF. The normal amount of fluid in the adult knee cavity is less
than 3.5 mL, but can increase to greater than 25 mL with
inflammation.
T
SPECIMEN COLLECTION AND HANDLING
TOF. Fluid from a
diseased joint may not clot.
F (Normal synovial fluid does not clot; however, fluid from a
diseased joint may contain fibrinogen and will clot)
SPECIMEN COLLECTION AND HANDLING
TOF. Therefore, fluid is often collected in a syringe that has been moistened with oxalate.
heparin
Required Tube Type
- Gram Stain and culture
- Glucose analysis
- Cell counts
- All other tests
A. Sodium Fluoride or Non-anticoagulated tube
B. EDTA or Heparin
C. SPS or sterile heparinized
D. Sodium Oxalate or Non-anticoagulated tube
E. Nonanticoagulated tube
C, A, B, E
SPECIMEN COLLECTION AND HANDLING
SPECIMEN COLLECTION AND HANDLING
ALL ARE CORRECT EXCEPT ONE:
A. Powdered anticoagulants should not be used.
B. The anticoagulated tube for other tests must be centrifuged and separated.
C. Specimens for crystal analysis should not be refrigerated.
D. All testing should be done as soon as possible to prevent cellular lysis and possible changes in crystals.
B (nonanti)
The word “synovial” comes from the Latin word for?
egg, ovum
Normal viscous synovial fluid resembles
egg white
COLOR AND CLARITY
color becomes a deeper yellow
anong clinical significance
noninflammatory and inflammatory effusions
COLOR AND CLARITY
greenish tinge
bacterial infection
COLOR AND CLARITY
Turbidity is frequently associated with the following except:
A. Synoviocytes
B. Fat droplets
C. Minerals
D. Synovial cell debris
E. NOTA
C
WBCs, RBCs, synoviocytes, crystals, fat droplets, synovial cell debris, and fibrin
COLOR AND CLARITY
When crystals are present the fluid may appear
Milky fluid
Synovial fluid viscosity comes from?
polymerization of the hyaluronic acid
VISCOSITY
This affects both the production of hyaluronate and its ability to polymerize, thus decreasing the fluid viscosity.
Arthritis
VISCOSITY
Hyaluronate polymerization can be measured using a?
Ropes, or mucin clot, test
VISCOSITY
Reagents of Ropes
2% to 5% acetic acid
VISCOSITY
When added to a solution of 2% to 5% acetic acid, normal synovial fluid forms a?
solid clot surrounded by clear fluid
VISCOSITY
The mucin clot test is reported in terms of (match good, fair, low, poor):
- Friable clot
- Soft clot
- No clot
- Solid clot
- Low
- Fair
- Poor
- Good
VISCOSITY
TOF. The mucin clot test is not routinely performed, because
all forms of arthritis decrease viscosity and little diagnostic information is obtained.
T
most frequently performed cell
count on synovial fluid
Total Leukocyte Count
CELL AND DIFFERENTIAL COUNTS
TOF. White blood cell (WBC) counts are seldom requested.
F (RBC)
CELL AND DIFFERENTIAL COUNTS
This is performed as soon as possible or the specimen should be refrigerated to prevent cellular disintegration.
Cell counts
CELL AND DIFFERENTIAL COUNTS
Very viscous fluid may need to be done, except:
A. Pretreated by adding one drop of 5% hyaluronidase in phosphate buffer per milliliter
B. Incubating at 37°C for 5 minutes
C. Pretreated by adding one drop of 0.05% hyaluronidase in phosphate buffer per milliliter
A
CELL AND DIFFERENTIAL COUNTS
Manual counts on thoroughly mixed specimens are done
using?
Neubauer counting chamber
CELL AND DIFFERENTIAL COUNTS
TOF. Clear fluids can usually be counted undiluted, but dilutions are necessary when fluids are turbid or bloody
T
CELL AND DIFFERENTIAL COUNTS
TOF. Traditional WBC diluting fluid can be used
F (contains acetic acid, it may produce a clot)
CELL AND DIFFERENTIAL COUNTS
TOF. 0.9g of NaCl dissolved in 100mL of sterile water can be used as a diluent.
T (Normal saline pa rin ‘yan)
CELL AND DIFFERENTIAL COUNTS
Suitable diluent necessary to lyse the RBCs
hypotonic saline
(0.3%) or saline that contains saponin
CELL AND DIFFERENTIAL COUNTS
Methylene blue added to the normal saline stains the?
WBC nuclei
CELL AND DIFFERENTIAL COUNTS
This diluent permits the separation of the RBCs and WBCs during counts performed on mixed specimens
Methylene blue
CELL AND DIFFERENTIAL COUNTS
Normal WBC count
WBC counts less than 200 cells/uL
CELL AND DIFFERENTIAL COUNTS
Differential counts should be performed on?
cytocentrifuged
preparations or on thinly smeared slides
CELL AND DIFFERENTIAL COUNTS
Prior to slide prep, fluid should be incubated with
hyaluronidase
CELL AND DIFFERENTIAL COUNTS
TOF. Neutrophils should account for less than 25% of the differential count and monocytes less than 15%.
F (lymphocytes <15%)
CELL AND DIFFERENTIAL COUNTS
Increased neutrophils indicate a
septic condition
CELL AND DIFFERENTIAL COUNTS
an elevated cell count with a predominance of
lymphocytes suggests a
nonseptic inflammation
CELL AND DIFFERENTIAL COUNTS
In both normal and abnormal specimens, cells may appear
more vacuolated
CELL AND DIFFERENTIAL COUNTS
primary cells seen in normal synovial fluid
Mononuclear cells
monocytes, macrophages, and synovial tissue cells
CELL AND DIFFERENTIAL COUNTS
may be present after crush injuries
lipid droplets
CELL AND DIFFERENTIAL COUNTS
seen in cases of pigmented villonodular synovitis
Hemosiderin
MATCH DESCRIPTIONS
- Reiter cell
- LE cell
- Synovial lining cell
- Macrophage (monocyte)
- Lymphocyte
A. Similar to macrophage, but
may be multinucleated, resembling a mesothelial cell
B. Mononuclear leukocyte
C. Vacuolated macrophage with
ingested neutrophils
D. Large mononuclear leukocyte, may be vacuolated
E. Neutrophil containing
characteristic ingested “round
body”
- C
- E
- A
- D
- B
MATCH SIGNIFICANCE
- Reiter cell
- LE cell
- Synovial lining cell
- Macrophage (monocyte)
- Lymphocyte
A. Lupus erythematosus
B. Normal Disruption from
arthrocentesis
C. Crystal-induced
inflammation & Non-septic inflammation
D. Reactive arthritis
(infection in another part
of the body)
E. Normal Viral infections
D, A, B, E, C
MATCH CELL/INCLUSION
- Neutrophil
- RA cell
- CartilaGe cells
- Rice bodies
- Fat Droplets
- Hemosiderin
A. Vacuolated macrophage with
ingested neutrophils
B. Microscopically show collagen and fibrin
C. Neutrophil with dark
cytoplasmic granules
containing immune
complexes
D. Refractile intracellular and
extracellular globules
E. Inclusions within clusters of
synovial cells
F. Large, multinucleated cell
- C
- A
- F
- B
- D
- E
MATCH SIGNIFICANCE
- Neutrophil
- RA cell
- Cartilage cells
- Rice bodies
- Fat Droplets
- Hemosiderin
A. Bacterial sepsis
B. Rheumatoid arthritis
Immunologic inflammation
C. Osteoarthritis
D. Traumatic injury Chronic
inflammation
E. Tuberculosis Septic and rheumatoid arthritis
F. Pigmented villonodular
synovitis
ABCEDF
CRYSTAL IDENTIFICATION
Microscopic examination of synovial fluid for the presence of
crystals is an important diagnostic test in evaluating?
arthritis
This formation in a joint frequently results in an acute, painful inflammation
Crystal
CRYSTAL IDENTIFICATION
Causes of crystal formation include metabolic disorders
and decreased renal excretion that produce the following, EXCEPT:
A. Elevated blood levels of crystallizing chemicals
B. Oral administration of medications, such as antihistamines
C. Degeneration of cartilage and bone
D. Injection of medications, such as corticosteroids
E. NOTA
B
CRYSTAL IDENTIFICATION
primary crystals seen in synovial fluid are (2)?
- monosodium urate (uric acid): gout
- calcium phosphate dihydrate: pseudogout
CRYSTAL IDENTIFICATION
most frequent causes of gout, increased serum uric acid results from, except:
A. Impaired metabolism of purines
B. Increased consumption of low-purine-content foods
C. Alcohol, and fructose
D. Chemotherapy treatment of leukemias
E. Decreased renal excretion of uric acid
B
CRYSTAL IDENTIFICATION
most often associated with degenerative arthritis, producing cartilage calcification and endocrine disorders that produce elevated serum calcium levels
Pseudogout
CRYSTAL IDENTIFICATION
present may include talcum powder and starch from gloves, precipitated anticoagulants, dust, and scratches on slides and cover slips. Slides and cover slips should be examined and if necessary, cleaned again before use
Artifacts
CHARACTERISTICS OF SYNOVIAL FLUID CRYSTALS
Needles
Monosodium urate
CHARACTERISTICS OF SYNOVIAL FLUID CRYSTALS
?:Rhomboid square, rods
Calcium pyrophosphate Dihydrate
CHARACTERISTICS OF SYNOVIAL FLUID CRYSTALS
Notched, rhomboid plates
Cholesterol
CHARACTERISTICS OF SYNOVIAL FLUID CRYSTALS
Flat, variable-shaped plates
Corticosteroid
CHARACTERISTICS OF SYNOVIAL FLUID CRYSTALS
?:Envelopes
Calcium
oxalate
CHARACTERISTICS OF SYNOVIAL FLUID CRYSTALS
Small particles
Require electron microscopy
Apatite (calcium phosphate)
CHARACTERISTICS OF SYNOVIAL FLUID CRYSTALS
Negative birefringence
- Monosodium urate
- Cholesterol
- Corticoteroid
- Caox
CHARACTERISTICS OF SYNOVIAL FLUID CRYSTALS
Positive birefingence
- Calcium pyrophosphate
- Corticosteroid (siya ay both posi and nega)
CHARACTERISTICS OF SYNOVIAL FLUID CRYSTALS
No birefringence
Apatite (calcium phosphate)
CHARACTERISTICS OF SYNOVIAL FLUID CRYSTALS
Match the clinical significance
1. Monosodium urate
2. Calcium pyrophosphate
3. Cholesterol
4. Corticosteroid
5. Calcium oxalate
6. Apatite
A. osteoathritis
B. renal dialysis
C. injections
D. extracellular
E. pseudogout
F. gout
FEDCBA
SLIDE PREPARATION
TOF. Both MSU and CPPD crystals are reported as being located extracellularly and intracellularly (within neutrophils); therefore, fluid must be examined after WBC disintegration.
before WBC disintegration
SLIDE PREPARATION
TOF. Fluid is examined as an unstained wet preparation.
T
SLIDE PREPARATION
The slide is examined under what magnification? using what microscope?
LPO and HPO; regular light microscope
SLIDE PREPARATION
Crystals (such as MSU and CPPD) can be seen in?
anong smear
Wright’s-stained smears
SLIDE PREPARATION
TOF. Wright-stained smears can be solely relied on for accurate identification.
F (the wet prep examination
and the use of polarized and red-compensated polarized light for identification)
SLIDE PREPARATION
- They may be extracellular or
located within the cytoplasm of
neutrophils. - They are frequently seen sticking
through the cytoplasm of the cell. - they lyse phagosome membranes and therefore do not appear in vacuoles.
Monosodium urate (uric acid) (MSU)
SLIDE PREPARATION
They are usually located within vacuoles of the neutrophils
CPPD
SLIDE PREPARATION
To avoid misidentification of CPPD crystals, the classic rhomboid shape should be observed and confirmed with?
red compensated polarized microscopy
Once the presence of the crystals has been determined using direct polarization, positive identification is made using?
first-order red-compensated polarized light
CRYSTAL POLARIZATION
A control slide for the polarization properties of MSU can be prepared using?
betamethasone acetate corticosteroid light
CRYSTAL POLARIZATION
this is is more highly birefringent and appears brighter against the dark background.
Monosodium urate
CRYSTAL POLARIZATION
What is placed in the microscope between the crystal and the analyzer, when compensated polarized light is used?
red compensator
CRYSTAL POLARIZATION
separates the light ray into slow-moving and fast-moving vibrations and produces a red background
compensator
CRYSTAL POLARIZATION
- molecules run parallel to the long axis of the crystal
- when aligned with the slow vibration, the velocity of the slow light passing through the crystal is not impeded as much as the fast light, which runs against the grain and produces a yellow color
- This is considered negative birefringence (subtraction of velocity from the fast ray).
MSU crystals
CRYSTAL POLARIZATION
- molecules run perpendicular to the long axis of the crystal
- when aligned with the slow axis of the compensator, the velocity of the fast light passing through the crystal is much quicker, producing a blue color
- positive birefringence.
CPPD crystals
CRYSTAL POLARIZATION
When the crystals are aligned perpendicular to the slow vibration, the color is?
reversed
CRYSTAL POLARIZATION
MSU: Direction of compensator ray is parallel to the crystal
and is what color
yellow
CRYSTAL POLARIZATION
MSU: Direction of compensator
ray is perpendicular to the crystal and is?
Blue
CRYSTAL POLARIZATION
CPPD: Direction of compensator ray
is parallel to the crystal and is?
Blue
CRYSTAL POLARIZATION
Direction of compensator ray is perpendicular to the crystal and is?
Yellow
CHEMISTRY TESTS
most frequently requested test
glucose determination
CHEMISTRY TESTS
markedly decreased glucose values indicate
inflammatiory (g2) and septic (g3)
CHEMISTRY TESTS
TOF. Normal synovial fluid glucose values are based on the blood glucose level.
T
CHEMISTRY TESTS
Fasting hours for glucose
8 hours
CHEMISTRY TESTS
Normal values:
- Synovial fluid glucose
- Total protein
- Uric Acid
A. less than 2.0 mmol/L
B. 6 to 8 mg/dL
C. not exceed 10 mg/dL below the blood value
D. less than 3 g/dL
CDB
CHEMISTRY TESTS
Glucose: 10 and 20 mg/dL
indicator for
Non-inflammatory and hemorrhagic joint disorders
CHEMISTRY TESTS
Glucose: 0 to 40 mg/dL below plasma level
Inflammatory disorders
CHEMISTRY TEST
20 to 100 mg/dL or 0 to 80Glucose: mg/dL less than the plasma level
Infectious and crystal-induced
CHEMISTRY TEST
Because the large protein molecules are not filtered through the synovial membranes, normal synovial fluid contains
less than 3g/dL protein
CHEMISTRY TEST
Increased levels of total protein
inflammatory and hemorrhagic disorders
CHEMISTRY TEST
TOF. Synovial fluid protein measurement does not contribute greatly to the classification of these disorders, inflammatory and hemorrhagic
T
CHEMISTRY TEST
demonstration of an elevated this may be used to confirm the diagnosis when the presence of crystals cannot be demonstrated in the fluid
uric acid level
CHEMISTRY TESTS
often measured as a first evaluation in suspected cases of gout.
Uric acid
CHEMISTRY TESTS
Increased in septic arthritis caused by gram-positive cocci
and gram-negative bacilli
lactate
CHEMISTRY TESTS
Arthritis caused by
lactate values are normal or low
Neisseria gonorrhoeae
CHEMISTRY TESTS
Lactate: Levels greater than 9 mmol/L (81 mg/dL) indicate
bacterial arthritis
and immediate onset of treatment
CHEMISTRY TESTS
to monitor the severity and prognosis of rheumatoid arthritis (RA).
Enzymes
MICROBIOLOGIC TESTS
may occur as a secondary complication of inflammation caused by trauma or through dissemination of a systemic infection
infection
MICROBIOLOGIC TESTS
two of the most important tests performed on synovial fluid.
culture & g/s
MICROBIOLOGIC TESTS
organisms are often missed on what test
g/s
MICROBIOLOGIC TESTS
most frequently seen infection
bacterial
MICROBIOLOGIC TESTS
Routine bacterial cultures should include an?
enrichment
MICROBIOLOGIC TESTS
the common organisms
that infect synovial fluid are the
fastidious Haemophilus
species and Neisseria gonorrhoeae.
MICROBIOLOGIC TESTS
For instance, the organism is difficult to grow in a culture,
molecular method is performed using?
PCR
MICROBIOLOGIC TESTS
PCR: Lyme Disease Arthritis
give genus and spp
MICROBIOLOGIC TESTS
PCR: osteoarticular tuberculosis
give the genus and spp
MICROBIOLOGIC TESTS
PCR: Chlamydia trachomatis and N. gonorrhoeae
give the disease
venereal arthritis
SEROLOGIC TESTS
present in the serum of most patients with RA
RF (rheumatoid factor)
SEROLOGIC TESTS
TOF. RF is present in the serum of most patients with RA, whereas just more than half of these patients will demonstrate RF in synovial fluid
T
SEROLOGIC TESTS
o Cause very serious joint inflammation
o Diagnosed in the serology laboratory by demonstrating the presence of their autoantibodies in serum.
Rheumatoid Arthritis and Systemic Lupus Erythematosus
SEROLOGIC TESTS
Arthritis is a frequent complication of Lyme disease.
Therefore, demonstrating antibodies to the?
Borrelia burgdorferi
Microbiological test
Causative agent of lyme disease arthritis
Borrelia burgdorferi
Microbiological test
Causative agent of osteoraticular tuberculosis
M. tuberculosis
Microbiological test
Causative agent of venereal arthritis
Chlamydia trachomatis & N. gonorrhoeae