25-Hydroxy and 1,25-Dihydroxy Vitamin D Are Not Substitute Tests
Similar vitamin D names refer to different measurements. Check the complete assay name before comparing an order or report.
2 min readCrispFacts
Health Facts
CrispFacts articles on health facts: practical explanations, relevant sources, and questions that help you understand the subject.
Urinalysis and Urine Culture Answer Different Questions
Routine examination and organism growth are different ways to study urine. Understand the distinction before comparing two reports.
2 min readTSH and Free T4: A Signal and a Hormone
Understand why TSH and free T4 appear together on some thyroid reports and why their names cannot be used interchangeably.
2 min readScreening, Diagnosis, and Monitoring Describe the Purpose
The same laboratory measurement can have different roles. Identify the purpose before deciding what a result is supposed to answer.
2 min readA Reference Interval Is Not a Personal Treatment Target
Separate the laboratory comparison interval from a diagnosis or a treatment goal chosen for an individual patient.
2 min readLDL, HDL, and Triglycerides: What a Lipid Panel Separates
A clear map of lipid-panel labels, including why triglycerides are not another name for cholesterol.
2 min readCollection Date, Report Date, and Review Date Are Different Events
Keep the sample date separate from the day a report appeared or a clinician discussed it when organizing laboratory records.
2 min readFerritin, Serum Iron, and TIBC Are Different Measurements
Compare the roles of iron-storage, circulating-iron, and binding measurements without treating one number as a supplement instruction.
2 min readFasting Glucose and Random Glucose: The Timing Is Part of the Name
Why fasting and random glucose results need their collection context, even though both measure blood glucose.
2 min readCBC and CBC With Differential: What the Extra Words Add
A CBC with differential adds a breakdown of white blood cells. Here is how that differs from the total white-cell count.
2 min readThe Eight Measurements in a Basic Metabolic Panel
A component-by-component map of the conventional BMP, including what belongs to another panel and why the group is not a health score.
2 min readHigh, Low, Positive, Indeterminate: Four Different Kinds of Lab Language
A flag, a detected target, and an uncertain finding answer different questions. Read the label before deciding what the number means.
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