Sentence examples for before a sample is from inspiring English sources

As an example, plutonium has a half-life of 24,100 years, and a decay of ten half-lives is required before a sample is considered to cease its radioactivity.

By requiring SEPT9 to be present in all standard replicates or one diluted replicate before a sample is classified positive, the test achieves a very high specificity (97%) and still retains substantial sensitivity (65%).

Numerous factors that occur before a sample is measured can influence results of blood tests.

These procedures may take 4 5 days before a sample is ready for examination.

For example, we require that 2 different PCR assays show positive results before we conclude that a sample is positive (21 ).

Before a sample was collected at a location, the container attached to the sampler and the bottle used to store the water were rinsed with the water collected at the location.

Blood for the second sample for CRP (CRP2) was collected from all babies except for four who died before a sample was taken.

A total of 100 thick blood smear fields were examined by using an oil immersion lens at 100× magnification before a sample was considered negative.

Virus isolation was attempted by using rabbit kidney and Vero cells in a biosafety level 3 facility until the third passage before a sample was considered negative (23 ).

Of 28 case-patients with available information, 21 (75%) were immunocompromised; 31 of 33case-patientscase-patientsved antivireceiveds before antiviralwas obtainedrugs

Cases were defined as laboratory-confirmed Cryptosporidium in a resident of Wales or the North West region with diarrhea in the 2 weeks before a sample was taken, and which was not part of a formal outbreak investigation.