Laboratory Parameters
Laboratory Parameters - Related Videos
06:19
Decontamination for Laboratory Biosafety
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2023
Robert M. Rioux and Zhifeng Chen, Pennsylvania State University, University Park, PA Decontamination is essential for laboratory biosafety, as the accumulation of microbial contamination in the laboratory can lead to the transmission of disease. The degree of decontamination can be classified as either disinfection or sterilization. Disinfection aims to eliminate all pathogenic microorganisms, with the exception of bacterial spores on lab surfaces or equipment. Sterilization, on the other hand,...
08:00
Measuring Mass in the Laboratory
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2023
The analytical balance is the common piece of equipment in the scientific laboratory. These highly precise instruments can measure down to ten thousandths or even hundred thousandths of a gram. The triple beam balance is a type of scale that uses counterweights on a three rider beams to counterbalance the sample in the pan. On the other hand, modern analytical balances use a complex system of electronic sensors to accurately mass a substance. The analytical balance is so sensitive that it...
07:27
Making Solutions in the Laboratory
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2023
The ability to successfully make solutions is a basic laboratory skill performed in virtually all biological and chemical experiments. A solution is a homogenous mixture of solute dissolved in bulk liquid known as the solvent. Solutions can be described by their solute concentration, a measure of how much solute is present per unit of solution. In this video, a step-by-step procedure for how to make a water-based, or aqueous, solution for biological applications is presented. The video...
01:10
Wave Parameters
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2023
The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
05:28
Guidelines in Case of a Laboratory Emergency
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2023
Robert M. Rioux & Zhifeng Chen, Pennsylvania State University, University Park, PA The most common laboratory emergencies include chemical spills, fire or explosion, electric shock, and personnel injuries. Most laboratory accidents occur due to poor planning or lack of attention. Therefore, it's always better to prevent accidents (being proactive) than having to take any actions during an emergency (being reactive). For example, always wear proper personal protective equipment (PPE) in the...
FAQs
An isolated result is interpreted against both its reference interval and the patient’s clinical context. A reference interval provides a comparison framework, but the meaning of a value depends on the health question being assessed and other available findings. This prevents laboratory data from being treated as self-sufficient conclusions and supports more appropriate diagnostic or monitoring decisions.
Repeated measurements can show whether a physiological change is progressing, improving, or remaining stable. This longitudinal view helps clinicians assess disease progression, evaluate a patient’s response to treatment, and identify possible complications. Comparing results over time therefore adds interpretive value beyond judging whether one measurement falls inside or outside a reference interval.
Standardized analytical methods make it possible to detect or quantify substances, cells, enzymes, hormones, electrolytes, and molecular markers in a consistent way. The resulting measurements provide objective evidence that can be compared with reference intervals and clinical findings. This analytical foundation allows laboratory data to support decisions rather than relying solely on symptoms or subjective impressions.
A sample from blood, urine, tissue, or another biological source is examined using a standardized analytical method. The method detects or quantifies a relevant characteristic, and the resulting measurement is compared with an appropriate reference interval. Clinicians then interpret that result alongside clinical context to determine its relevance for investigation, diagnosis, or follow-up.
They support several stages of medical care, including screening, diagnosis, treatment selection, and monitoring. The same type of measurement may help identify a possible abnormality during screening, contribute to evaluating disease, inform therapeutic choices, or show whether an intervention is producing the intended response. Their role changes according to the clinical question and timing of assessment.
Laboratory measurements can reveal physiological changes that are not apparent from symptoms alone. An unexpected result may prompt additional clinical investigation, while a pattern across multiple results can help clarify disease progression or suggest a complication. In this way, laboratory data complement clinical assessment by supplying objective information that can refine the direction of medical evaluation.