Long-term urine biobanking: storage stability of clinical-chemical parameters under moderate freezing without preservatives
Remer, Montenegro-Bethancourt & Shi
The finding, in our words
The honest counterpoint: many liquid-urine parameters, creatinine, iodine, nitrogen and minerals, remained valid after 12–15 years frozen at −22 °C without preservative.
A paraphrase to the Library’s standard, never the abstract. The source is one link away and is always the authority.
This review establishes that microsampling across blood, saliva, urine and stool matrices offers validated workflows and regulatory recognition for human biomonitoring comparable to conventional methods. It finds that these decentralised approaches enhance participant acceptability and enable screening in remote or low-resource settings.
The study developed a curcumin-embedded paper sensor for bilirubin detection in saliva, coupled with an IoT-enabled hand-held reader. Clinical testing in 18 jaundiced infants demonstrated good correlation with reference methods for both salivary and blood bilirubin, indicating utility for decentralised neonatal jaundice monitoring.
Adding polyethylene glycol to first-void urine before centrifugation markedly improved cell-free DNA recovery in the pellet, whereas low-speed centrifugation alone removed cellular DNA while keeping cell-free DNA in the supernatant. Pseudovirions pelleted reliably under all conditions, but the study revealed substantial variation between self-collected samples, highlighting the need for standardised protocols in decentralised HPV screening programmes.
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Midstream urine self-collection demonstrated adequate sensitivity for Chlamydia trachomatis screening in asymptomatic patients, although it was less sensitive than vaginal swabs in women, and the study confirmed that nucleic acids in neat urine remain stable for up to seven days when stored at 4°C.