Expanded needle and syringe guide
How to choose the correct syringe size?
BD is a high quality of syringes, which is easy to
use. Before you choose a syringe, make sure you
know how many ml you need for the optimal
solution. (Ask your doctor about this).
How to measure the thickness of your skinfold?
To measure your skinfold choose an area on your
thigh squeeze with your thumb and forefinger
and pull away from the muscles, make sure it’s
not just the skin you are pulling. Measure the
tissue right between your thumb and forefinger;
you can use an ordinary ruler for this.
If you are injecting intramuscular your needle size
is 2/3 the thickness of the tissue. If you are
injection subcutaneous your needle size is 1/3
the thickness of the tissue.
How to choose the correct length of needle?
If your tissue measures 30 mm, the needle length
for an intramuscular injection should be 2/3 of
the tissue, around 20 mm. The optimal needle
length to choose would be 25 mm. For the
subcutaneous injection, the needle size should be
1/3 of the tissue, about 10 mm. The correct
needle to choose is the 10 mm, to inject the right
tissue, to get the right effect of the medicine and
reduce the risk of injection site reactions.
How to choose the correct thickness of needle?
The thickness of the needle depends of which
kind of fluid you are injecting. If the fluid are oil
based you should choose a needle, which is
thicker than with liquid medicine.
All the needles is used for liquid fluid. The
needles with a thickness on 0.5 mm or above are
also used for oil-based medicine.
How to make a z-track injection?
The Z-track method of an intramuscular injection
is used to prevent tracking (leakage) of the
medication into the subcutaneous tissue.
To make a Z-track injection the skin and tissue are
pulled and held firmly while the needle is
inserted into the muscle. After the medication is
injected, the skin and tissue are released.
A Z-track injection helps to prevent medication
from seeping into the subcutaneous tissue and
ensures a full dosage. This is why we recommend
this type of injection, in the thigh, sitting down
To make a z-track injection use one hand to pull
downward on your skin and subcutaneous tissue,
hold it firmly about an inch away (2.54 cm) from
the muscle. Use the 90-degree injector to get the
right angle. The needle will be quickly inserted
deeply enough to penetrate your muscle.
Then pull back the plunger and check the syringe
for evidence of aspirated blood. If blood is
present, it means a vein may have been hit, so a
new site must be used. This will involve a new
needle and fresh medication.
If there is no blood in the syringe, inject the
medication slowly directly into the muscle. The
needle will remain in place for about 10 seconds
before it is withdrawn.
When the skin and tissue are released, the needle
track is broken, briefly forming a shape like the