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Human Procalcitonin
（PCT） ELISA Kit
Catalog No. CSB-E09502h
（96 tests）
? This immunoassay kit allows for the in vitro quantitative determination of human
PCT concentrations in serum, plasma and other biological fluids.
? Expiration date six months from the date of manufacture
? FOR RESEARCH USE ONLY. NOT FOR USE IN DIAGNOSTIC PROCEDURES.
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INTRODUCTION
Procalcitonin （PCT） is a precursor of the hormone calcitonin,
which is involved with calcium homeostasis, and is produced by
the C-cells of the thyroid gland. It is there that procalcitonin is
cleaved into calcitonin, katacalcin and a protein residue.
Measurement of procalcitonin can be used as a marker of severe
sepsis and generally grades well with the degree of sepsis,
although levels of procalcitonin in the blood are very low. PCT
has the greatest sensitivity （85%） and specificity （91%） for
differentiating patients with SIRS from those with sepsis, when
compared with IL-2, IL-6, IL-8, CRP and TNF-alpha. Evidence is
emerging that procalcitonin levels can reduce unnecessary
antibiotic prescribing to people with lower respiratory tract
infections. Currently though, procalcitonin assay is not used
outside the context of clinical trials.
PRINCIPLE OF THE ASSAY
The microtiter plate provided in this kit has been pre-coated with
an antibody specific to PCT. Standards or samples are then
added to the appropriate microtiter plate wells with a Horseradish
Peroxidase （HRP） -conjugated antibody preparation specific for
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PCT and incubated. Then substrate solutions are added to each
well. The enzyme-substrate reaction is terminated by the
addition of a sulphuric acid solution and the color change is
measured spectrophotometrically at a wavelength of 450 nm ± 2
nm. The concentration of PCT in the samples is then determined
by comparing the O.D. of the samples to the standard curve.
DETECTION RANGE
125 pg/ml-4000 pg/ml. The standard curve concentrations used
for the ELISA’s were 4000 pg/ml, 2000 pg/ml, 875 pg/ml, 375
pg/ml, 125pg/ml.
SPECIFICITY
This assay recognizes human PCT. No significant
cross-reactivity or interference was observed.
SENSITIVITY
The minimum detectable dose of human PCT is typically less
than 62.5 pg/ml.
The sensitivity of this assay, or Lower Limit of Detection （LLD）
was defined as the lowest protein concentration that could be
differentiated from zero.
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MATERIALS PROVIDED
Reagent Quantity
Assay plate 1
Standard 5 x 0.5 ml
HRP-conjugate 1 x 6 ml
Substrate A 1 x 7 ml
Substrate B 1 x 7 ml
Stop Solution 1 x 7 ml
Standard S1 S2 S3 S4 S5
Concentration
（pg/ml） 125 375 875 2000 4000
STORAGE
1. Unopened test kits should be stored at 2-8 C upon receipt
and the microtiter plate should be kept in a sealed bag. The
test kit may be used throughout the expiration date of the kit.
Refer to the package label for the expiration date.
2. Opened test kits will remain stable until the expiring date
shown, provided it is stored as prescribed above.
3. A microtiter plate reader with a bandwidth of 10 nm or less
and an optical density range of 0-3 OD or greater at 450nm
wavelength is acceptable for use in absorbance
measurement.
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OTHER SUPPLIES REQUIRED
? Microplate reader capable of measuring absorbance at 450
nm, with the correction wavelength set at 540 nm or 570 nm.
? Pipettes and pipette tips.
? Deionized or distilled water.
? Squirt bottle, manifold dispenser, or automated microplate
washer.
SAMPLE COLLECTION AND STORAGE
? Serum Use a serum separator tube （SST） and allow
samples to clot for 30 minutes before centrifugation for 15
minutes at 1000 x g. Remove serum and assay immediay
or aliquot and store samples at -20℃. Centrifuge the sample
again after thawing before the assay. Avoid repeated
freeze-thaw cycles.
? Plasma Collect plasma using citrate, EDTA, or heparin as
an anticoagulant. Centrifuge for 15 minutes at 1000 x g within
30 minutes of collection. Assay immediay or aliquot and
store samples at -20℃. Centrifuge the sample again after
thawing before the assay. Avoid repeated freeze-thaw cycles.
Note: Grossly hemolyzed samples are not suitable for use in this assay.
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ASSAY PROCEDURE
Bring all reagents and samples to room temperature before use. It is
recommended that all samples, standards, and controls be assayed in duplicate.
All the reagents should be added directly to the liquid level in the well. The
pipette should avoid contacting the inner wall of the well.
1. Set a Blank well without any solution. Add 50μl of Standard
or Sample per well.
2. Add 50μl of HRP-Conjugate to each well （Not to Blank!）.
Incubate for 1 hour at 37°C.
3. Aspirate each well and wash, repeating the process three
times for a total of three washes. Wash by filling each well
with ddH2O （200μl） using a squirt bottle, multi-channel
pipette, manifold dispenser or autowasher. Complete
removal of liquid at each step is essential to good
performance. After the last wash, remove any remaining
Wash Buffer by aspirating or decanting. Invert the plate and
blot it against clean paper towels.
4. Add 50μl of Substrate A and 50μl Substrate B to each well.
Incubate for 15 minutes at 37°C. Keeping the plate away from
drafts and other temperature fluctuations in the dark.
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5. Add 50μl of Stop Solution to each well. If color change does
not appear uniform, gently tap the plate to ensure thorough
mixing.
6. Determine the optical density of each well within 30 minutes,
using a microplate reader set to 450 nm.
CALCULATION OF RESULTS
Average the duplicate readings for each standard, control, and
sample and subtract the average zero standard optical density.
Create a standard curve by reducing the data using computer
software capable of generating a four parameter logistic （4-PL）
curve-fit. As an alternative, construct a standard curve by plotting
the mean absorbance for each standard on the y-axis against
the concentration on the x-axis and draw a best fit curve through
the points on the graph. The data may be linearized by plotting
the log of the PCT concentrations versus the log of the O.D. and
the best fit line can be determined by regression analysis. This
procedure will produce an adequate but less precise fit of the
data. If samples have been diluted, the concentration read from
the standard curve must be multiplied by the dilution factor.
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LIMITATIONS OF THE PROCEDURE
? The kit should not be used beyond the expiration date on the
kit label.
? Do not mix or substitute reagents with those from other lots or
sources.
? If samples generate values higher than the highest standard,
dilute the samples and repeat the assay.
? Any variation in operator, pipetting technique, washing
technique, incubation time or temperature, and kit age can
cause variation in binding.
? This assay is designed to eliminate interference by soluble
receptors, binding proteins, and other factors present in
biological samples. Until all factors have been tested in the
Quantikine Immunoassay, the possibility of interference
cannot be excluded.
TECHNICAL HINTS
? When mixing or reconstituting protein solutions, always avoid
foaming.
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? To avoid cross-contamination, change pipette tips between
additions of each standard level, between sample additions,
and between reagent additions. Also, use separate reservoirs
for each reagent.
? When using an automated plate washer, adding a 30 second
soak period following the addition of wash buffer, and/or
rotating the plate 180 degrees between wash steps may
improve assay precision.
? To ensure accurate results, proper adhesion of plate sealers
during incubation steps is necessary.
? Substrate Solution should remain colorless until added to the
plate. Keep Substrate Solution protected from light. Substrate
Solution should change from colorless to gradations of blue.
? Stop Solution should be added to the plate in the same order
as the Substrate Solution. The color developed in the wells
will turn from blue to yellow upon addition of the Stop Solution.
Wells that are green in color indicate that the Stop Solution
has not mixed thoroughly with the Substrate Solution.