2. CULTURE TEST
▪ Medical laboratory test used to
identify the presence of an
microorganism in patient’s
sample
▪ Culture- observable growth
▪ Media- substance required for
the growth of culture
3. SAMPLE COLLECTION
▪ Main and important step
▪ Collected by well trained expert
▪ If does not collect properly,
may leads to false positive
result or damage to patient
5. VENIPUNCTURE
▪ Collected from vein
▪ For laboratory testing i.e. culture
test
▪ Performed by phlebotomist
▪ Easier than arterial sampling
▪ Drawn from the vein of top of the hand
or inside of the elbow
7. METHOD
▪ Medical history of patient
▪ Find vein
▪ Wear disposable gloves
▪ Tie tourniquet on patient’s arm
▪ Wipe the blood collection area with alcohol
pad
▪ With the help of syringe, collect venous
blood following aseptic precautions
▪ Then inoculate the sample immediately into
bottle containing BHI, after disinfect the
bottle
8. Brain Heart Infusion (BHI)
BHI broth is a highly nutritive
media for cultivating wide variety
of microorganisms.
9. ▪ Remove the cap and disinfect the rubber cork
with alcohol pad.
▪ Replace the needle with new one and insert
the syringe in rubber cork. Don’t press the
syringe as it leads to hemolysis.
▪ Mix the blood slowly in BHI broth bottle as
not to allow the blood to clot in culture
media because bacteria will get trapped in
the clot.
▪ Incubate the blood culture bottle at 37°C for
about 7 days and observe regularly for
turbidity.
▪ If turbidity occurs, then perform sub-
culture.
10. NOTE
▪ Blood should be collect before
antimicrobial treatment.
▪ The ratio of blood-to-nutrient broth
must be correct.
▪ Check the sterility of BHI bottle before
inoculation of blood.
▪ If the media is turbid, discard the
bottle.
11. URINE SAMPLE COLLECTION
▪ Label a sterile, screw-top container.
▪ Wash your hands.
▪ Collect “mid-stream” urine in the
container.
▪ Screw the lid of the container
properly.
▪ Wash your hands thoroughly.
12. MID-STREAM URINE
▪ A mid-stream urine sample means you
don’t collect the first or last part
of urine that comes out. This reduces
the risk of the sample being
contaminated with bacteria from: your
hands, the skin around the urethra.
▪ This is the preferred type of
specimen for culture and sensitivity
testing because of the reduced
incidence of cellular and microbial
contamination.
13. NOTE
▪ Processed the sample within 2 hours
directly after collection.
▪ Refrigerated samples must be processed
within 24 hours.
▪ Sample with borate preservative must be
processed with in 24 hours.
▪ If the sample will not tested timely, it
may leads to false positive results.