Lab Tests & Diagnostics
What clinical laboratory tests actually measure, how the numbers are produced, and how to read a report without panicking.
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Why Some Lab Results Take Hours and Others Take Weeks
Analysis is almost never the slow part. Following a sample through every queue in the workflow shows where the waiting actually happens.
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How to Read a Pathology Report Without Panicking
A pathology report is a formulaic document written for clinicians, and most of the alarm it causes comes from the structure rather than the findings.
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Newborn Screening: What the Heel Prick Card Detects
The heel prick card is a population screen, not a diagnosis. It is deliberately tuned to over-refer, and understanding why makes a recall call much less…
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Drug Screening: Why Screens Need Confirmation
A positive drug screen is not a result. It is a request for a second, definitive test, and the two-step design is deliberate rather than a…
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Stool Testing: From Culture Plates to PCR Panels
Molecular panels find far more organisms than culture ever did, which has created a new problem: deciding which of the findings is actually making someone ill.
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Semen Analysis: Reading the Parameters Properly
The reference values on a semen analysis are percentiles drawn from men who fathered children, not a pass mark. That distinction changes how the report should…
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Thyroid Antibodies: TPO, Thyroglobulin and TRAb
Three thyroid antibodies are routinely ordered together, and each answers a different question. Two of them are often unnecessary.
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Lipoprotein(a): The Inherited Risk Number Few People Test
A standard lipid panel does not measure it, your level was largely fixed at conception, and a single test can settle the question for life.
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HbA1c, Fasting Glucose or OGTT: Choosing the Test
The three routes to a diabetes diagnosis measure different things, and they disagree often enough that which one you are given genuinely matters.
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Blood Cultures and the Skin Contamination Problem
A blood culture that grows something is not the same as a bloodstream infection, and telling the two apart shapes days of treatment.
