Janoshik, Medutest, PeptideMeter, VendorInvestigate: a capability audit
Four independent services underpin confidence in this market. All four are competent at chemistry. Microbiology is a different accreditation, a different facility and a…
Sterility
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The convention nobody explains before handing over the vial
A unit is a volume. A dose is a mass. The bridge between them is concentration, and concentration is a number somebody has to calculate.
What PeptideMeter charges to answer the pyrogen question
Bacterial endotoxin is a heat-stable lipopolysaccharide from the outer membrane of Gram-negative organisms. It survives sterilisation, passes a sterilising filter, and is…
What Medutest charges to answer the pyrogen question
We submitted vials for endotoxin determination and report the results, the method and the laboratory, because a pyrogen figure without a method is as empty as a purity…
An error taxonomy for a market without a pharmacist
The recurring errors in this market are not exotic. They are a small set of arithmetic and reading failures, each capable of moving a dose by a factor of two or ten.
Janoshik, Medutest, PeptideMeter, VendorInvestigate: a capability audit
Four independent services underpin confidence in this market. All four are competent at chemistry. Microbiology is a different accreditation, a different facility and a…
What the four services actually offer, test by test
A compendial sterility test takes fourteen days of incubation and consumes the containers tested. That timescale is incompatible with the business model that made…
The intramuscular injection nobody intended
Longer needles reach muscle in lean limbs, and intramuscular delivery of a long-acting depot changes absorption in ways nobody wants.
What the four services actually offer, test by test
Four independent services underpin confidence in this market. All four are competent at chemistry. Microbiology is a different accreditation, a different facility and a…
The pyrogen question has a price, and it is not the price of a purity run
A compendial sterility test takes fourteen days of incubation and consumes the containers tested. That timescale is incompatible with the business model that made…
A calculation you should do twice and write down once
Every time a vial changes, the conversion must be recalculated. Carrying forward a unit count from the last vial is the single most reliable way to give the wrong dose.
Mapping a rotation that you will actually follow
The evidence base here is the insulin injection-technique literature, which is large and transfers well on tissue questions.
What the four services actually offer, test by test
Endotoxin is the more tractable of the two questions, and a kinetic chromogenic determination is neither slow nor exotic. It is simply not on the menu.
Endotoxin is not a microorganism, and killing the bacteria does not remove it
The masking phenomenon known as low endotoxin recovery means a formulation can return a clean result while containing endotoxin the assay cannot see.
In-use periods, and the ones nobody can give you
A needle blunts on first use. Reuse is uncomfortable, and it is a documented contributor to lipohypertrophy.
How a correct calculation becomes a wrong dose
A pharmacist catches most of these in licensed practice. In this market there is no pharmacist, so the checks have to be structural.
LAL, kinetic chromogenic, recombinant factor C: three ways to the same figure
The masking phenomenon known as low endotoxin recovery means a formulation can return a clean result while containing endotoxin the assay cannot see.
Storage after reconstitution, and the evidence behind the numbers
The air shot before a pen injection removes air from the cartridge and confirms flow. Skipping it can mean a materially reduced dose, and it is skipped constantly.
Container closure integrity, and the tests that actually probe it
A sterile product is sterile only for as long as its container closure system excludes the outside world. Integrity is testable, and the tests are cheap by the standards of…
The intramuscular injection nobody intended
Skin thickness at the standard injection sites is approximately two millimetres in adults and varies remarkably little with body mass. That single finding is why short…